Jefferson County, MO International Residential Code 2015

[Ord. No. 11-0248 §1(Art. III §1), 8-9-2011; Ord. No. 13-0459 §1, 12-10-2013; Ord. No. 17-0431, 9-28-2017[1]; Ord. No. 23-0465, 11-16-2023]

The International Residential Code, 2015 Edition, is hereby amended as follows:

R101.1. Delete and insert in lieu thereof the following: Title. These provisions shall be known as the Residential Code for One- and Two-family Dwellings of Jefferson County, Missouri, and shall be cited as such and will be referred to herein as "this code."

R102.7. Delete and insert in lieu thereof the following: Existing Structures. The legal occupancy of any structure existing on the date of adoption of this code shall be permitted to continue without change, except as is specifically covered in this code, the International Fire Code, or as is deemed necessary by the building official for the general safety and welfare of the occupants and the public.

R103.1. Delete entire section.

R105.2. Delete and insert in lieu thereof the following: Work Exempt from Permit. Exemption from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of Jefferson County, Missouri. Permits shall not be required for the following:

Building:
1.	One-story detached accessory structures, provided that the floor area does not exceed two hundred (200) square feet.
2.	Fences not over eight (8) feet (2,438 mm) high.
3.	Retaining walls that are not over six (6) feet in height measured from the finished grade to the top of the wall, excluding the cap, unless supporting a surcharge.
4.	Water tanks supported directly upon grade if the capacity does not exceed five thousand (5,000) gallons (18,927 L) and the ratio of height to diameter or width does not exceed 2 to 1.
5.	Sidewalks, driveways, patios and door landing pads.
6.	Painting, papering, tiling, carpeting, cabinets, counter tops, replacement of flooring, trim, finish and similar finish work.
7.	Prefabricated swimming pools that are less than twenty four (24) inches (610 mm) deep.
8.	Swings and other playground equipment.
9.	Window awnings supported by an exterior wall that do not project more than fifty-four (54) inches (1,372 mm) from the exterior wall and do not require additional support.
10.	Decks not exceeding two hundred (200) square feet in area, that are not more than thirty (30) inches (762 mm) above grade at any point, are not attached to a dwelling do not serve the exit door required by Section R311.4.
11.	Single family residential roof replacement, replacement roofing that involves the shingles, the underlayment and/or the sheathed decks.
12.	Replacement of siding.
13.	Replacement of doors and/or windows provided opening size and operation do not change.
14.	Residential kitchen appliance replacement.
15.	Hot water heater replacement.
16.	Garage door and opener replacement.
17.	Minor repairs as referenced in Section 105.2.2.

Gas:
1.	Portable heating, cooking or clothes drying appliances.
2.	Replacement of any minor part that does not alter approval of equipment or make such equipment unsafe.
3.	Portable-fuel-cell appliances that are not connected to a fixed piping system and are not interconnected to a power grid.

Mechanical:
1.	Portable heating appliances.
2.	Portable ventilation appliances.
3.	Portable cooling units.
4.	Steam, hot- or chilled-water piping within any heating or cooling equipment regulated by this code.
5.	Replacement of any minor part that does not alter approval of equipment or make such equipment unsafe.
6.	Portable evaporative coolers.
7.	Self-contained refrigeration systems containing ten (10) pounds (4.54 kg) or less of refrigerant or that are actuated by motors of one (1) horsepower (746 W) or less.
8.	Portable-fuel-cell appliances that are not connected to a fixed piping system and are not interconnected to a power grid.

Plumbing:
1.	The stopping of leaks in drains, water, soil, waste or vent pipe.
2.	The clearing of stoppages or the repairing of leaks in pipes, valves or fixtures, and the removal and reinstallation of existing fixtures.

R105.3.1.1. Delete entire section.

R106.1. Delete and insert in lieu thereof the following: Submittal Documents. Submittal documents shall include any form signed by the purchaser of any single-family dwelling or residence or multi-unit dwelling of four (4) or fewer units stating that prior to entering into a purchase contract the purchaser was offered by the builder the option to have fire sprinklers installed in the structure at the purchaser's expense. The construction documents should be prepared by a registered design professional.

R106.1.1. Insert the following additional sentence: Construction documents shall be to scale and of sufficient clarity. Construction documents for new one- and two-family dwellings shall require the name and contact information of the architect, draftsman, or individual who prepared said documents.

R106.3.1. Delete and insert in lieu thereof the following: Approval Of Construction Documents. Where the building official issues a permit, the construction documents shall be approved in writing or by a stamp that states "REVIEWED FOR CODE COMPLIANCE." One (1) set of construction documents so reviewed shall be retained by the building official. The other set may be kept at the site of work or made available at the time of inspection and shall be open to inspection by the building official or a duly authorized representative.

R108. Delete entire section. (Refer to Jefferson County Building Code Sections 500.250 — 500.260).

R110. Delete entire section.

R111. Delete entire section. (Refer to Jefferson County Building Code Section 500.270).

R112. Delete entire section. (Refer to Jefferson County Building Code Section 500.280).

R113. Delete entire section. (Refer to Jefferson County Building Code Section 500.300).

R114. Delete entire section. (Refer to Jefferson County Building Code Section 500.310).

R202. Insert the following: CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this Code.

R202. SPLINE. Delete and insert in lieu thereof the following: SPLINE. A manufacturer approved connector used to connect two (2) structural insulated panels. The strip (spline) fits into a groove cut into the vertical edges of the two (2) structural insulated panels to be joined. Splines are used behind each facing of the structural insulated panels being connected as shown in Figure R613.8.

R202. STORY ABOVE GRADE PLANE. Delete and insert in lieu thereof the following: STORY ABOVE GRADE PLANE. Any story having its finished floor surface entirely above grade plane, or in which the finished surface of the floor next above is:
	1.	More than six (6) feet (1,829 mm) above grade plane, and
	2.	Approximately six (6) feet (1,829 mm) above the finished ground level for approximately fifty percent (50%) of the total building perimeter, and
	3.	More than twelve (12) feet (3,658 mm) above the finished ground level at any point.

TABLE R301.2(1). Delete and insert in lieu thereof the following:
Table R301.2(1)
Climatic and Geographic Design Criteria
	Wind Design					Subject to Damage Form
Ground Snow Load	Speed^d (mph)	Topo-graphic effects^k	Special wind region¹	Wind-borne debris zone^m	Seismic Design Cate-gory^f	Wea-thering^a	Frost line depth^b	Ter-mite^e	Winter Design Temp^a	Ice Barrier Under-layment Re-quired^b	Flood Haz-ards^g	Air Freez-ing Index^l	Mean Annual Temp^j
20	115 (51)	NO	NO	NO	C	SEVERE	30	NO	6	NO		1,000	55.2

For SI: 1 pound per square foot = 0.0479kPa, 1 mile per hour = 0.447 m/s.
a.	Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code. The weathering column shall be filled in with the weathering index, "negligible," "moderate" or "severe" for concrete as determined from Figure R301.2(3). The grade of masonry units shall be determined from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or C652.
b.	The frost line depth may require deeper footings than indicated in Figure R403.1(1). The jurisdiction shall fill in the frost line depth column with 30, the minimum depth of footing below finish grade.
c.	The jurisdiction shall fill in this part of the table to indicate the need for protection depending on whether there has been a history of local subterranean termite damage.
d.	The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map [Figure R301.2(4)A]. Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4.
e.	The outdoor design dry-bulb temperature shall be selected from the columns of ninety-seven and one-half percent (97 1/2%) values for winter from Appendix D of the International Plumbing Code. Deviations from the Appendix D temperatures shall be permitted to reflect local climates or local weather experience as determined by the building official.
f.	The jurisdiction shall fill in this part of the table with the seismic design category determined from Section R301.2.2.1.
g.	The jurisdiction shall fill in this part of the table with: (a) the date of the jurisdiction's entry into the National Flood Insurance Program (date of adoption of the first code or ordinance for management of flood hazard areas), (b) the date(s) of the Flood Insurance Study, and (c) the panel numbers and dates of the currently effective FIRMs and FBFMs or other flood hazard map adopted by the authority having jurisdiction, as amended.
h.	The jurisdiction shall fill in this part of the table with the 100-year return period air freezing index (BF-days) from Figure R403.3(2) or from the 100-year (99%) value on the National Climatic Data Center data table "Air Freezing Index — USA Method (Base 32° F.)."
i.	The jurisdiction shall fill in this part of the table with the mean annual temperature from the National Climatic Data Center data table "Air Freezing Index — USA Method (Base 32° F.)."
j.	In accordance with Section R301.2.1.5, where there is local historical data documenting structural damage to buildings due to topographic wind speed-up effects, the jurisdiction shall fill in this part of the table with "YES." Otherwise, the jurisdiction shall indicate "NO" in this part of the table.
k.	In accordance with Figure R301.2(4)A, where there is local historical data documenting unusual wind conditions, the jurisdiction shall fill in this part of the table with "YES" and identify any specific requirements. Otherwise, the jurisdiction shall indicate "NO" in this part of the table.
l.	In accordance with Section R301.2.1.2.1, the jurisdiction shall indicate the wind-borne debris wind zone(s). Otherwise the jurisdiction shall indicate "NO" in this part of the table."

R302.1. Delete and insert in lieu thereof the following: Exterior walls. Construction, projections, openings and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table R302.1(1) as amended; or dwellings equipped throughout with an automatic sprinkler system installed in accordance with Section P2904 shall comply with Table R302.1(2).
	Exceptions:
	1.	Walls, projections, openings or penetrations in walls perpendicular to the line used to determine the fire separation distance.
	2.	Walls of dwellings and accessory structures located on the same lot.
	3.	Detached tool sheds and storage sheds, playhouses and similar structures exempted from permits are not required to provide wall protection based on location on the lot. Projections beyond the exterior wall shall not extend over the lot line.
	4.	Detached garages accessory to a dwelling located within two (2) feet (610 mm) of a lot line are permitted to have roof eave projections not exceeding four (4) inches (102 mm).
	5.	Foundation vents installed in compliance with this code are permitted.
	6.	Cantilevered manufactured fireplaces.
	7.	Roof eave overhangs.
	8.	Uncovered decks.

Table R302.1(1)
Exterior Walls
Exterior Wall Element	Minimum Fire-Resistance Rating	Minimum Fire Separation Distance
TABLE R302.1(1). Delete and insert in lieu thereof the following:
Walls	Fire-resistance rated	1 hour - tested in accordance with ASTM E 119 or UL 263 with exposure from both sides	0 Feet to < 3 Feet
	Not fire-resistance rated	0 hours	> 3 Feet
Projections	Fire-resistance rated	1 hour on the underside^a,b	2 Feet
	Not fire-resistance rated	0 hours	3 Feet
Openings in walls	Not allowed	N/A	< 3 Feet
	25% maximum of wall area	0 hours	3 Feet
	Unlimited	0 hours	3 Feet
Penetrations	All	Comply with Section R302.4	<3 Feet
		None required	3 Feet
For SI: 1 foot = 304.8 mm

N/A = Not Applicable.
	a.	Roof eave fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the eave if fireblocking is provided from the wall top plate to the underside of the roof sheathing.
	b.	Roof eave fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the eave provided that gable vent openings are not installed.

R302.2(2) Townhouses. Delete subparagraph 2 and insert in lieu thereof the following:
	2.	Where a fire sprinkler system in accordance with Section P2904 is not provided, the common wall shall be not less than a two-hour fire-resistance-rated wall assembly tested in accordance with ASTM E 119 or UL 263, or the common wall shall be two (2) independent one-hour fire-resistance-rated wall assemblies.

R302.5.1. Delete and insert in lieu thereof the following: Opening protection. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than one and three-eights (1 3/8) inches (35 mm) in thickness, solid or honeycomb-core steel doors not less than one and three-eights (1 3/8) inches (35 mm) thick, or twenty-minute fire-rated doors.

R302.6. Delete and insert in lieu thereof the following: Dwelling-garage fire separation. The garage shall be separated by five-eights (5/8) inch fire code gypsum board, type X. Openings in garage walls shall comply with Section R302.5. Attachment of gypsum board shall comply with Table R702.3.5. The wall separate provisions of Table R302.6 shall not apply to garage walls that are perpendicular to the adjacent dwelling unit wall.

R302.13. Delete entire section.

R303.3. Delete and insert in lieu thereof the following: Bathrooms. Bathrooms, water closet compartments and other similar rooms shall be provided with aggregate glazing area in windows of not less than three (3) square feet (0.3 m²), one-half (1/2) of which must be openable.
	Exception: The glazed areas shall not be required where artificial light and a local exhaust system are provided. The minimum local exhaust rates shall be determined in accordance with Section M1507. Exhaust air from the space shall be exhausted directly to the outdoors, to a ventilated soffit, or a gabled end vent.

R303.4. Delete and insert in lieu thereof the following: Mechanical ventilation. Where the air infiltration rate of a dwelling unit is three (3) air changes per hour or less where tested with a blower door at a pressure of 0.2 inch w.c. (50 Pa) in accordance with Section N1102.4.1.2, the dwelling unit shall be provided with whole-house mechanical ventilation in accordance with Section M1507.3.

R303.5.2. Delete and insert in lieu thereof the following: Exhaust openings. Exhaust air shall not be directed below six (6) feet and eight (8) inches onto public walkways.

R303.8. Delete and insert in lieu thereof the following: Exterior stairway illumination. Exterior stairways shall be provided with an artificial light source. Exterior stairways providing access to a basement from the outdoor grade level shall be provided with an artificial light source located at the bottom landing of the stairway.

R309.1. Delete and insert in lieu thereof the following: Floor surface. Garage floor surfaces shall be of approved non-combustible material. The area of floor used for parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to the main vehicle entry doorway. In private garages with front or rear entry located beneath habitable rooms the floor at the rear shall be a minimum of two (2) inches lower than the adjacent basement floor. In private garages with end entry located beneath habitable rooms the floor shall be a minimum of four (4) inches lower than the adjacent basement floor. In private garages attached side-by-side to rooms, the floor at the rear shall be a minimum of two (2) inches lower than the house foundation wall. All floors Minimum thickness of garage floors shall be four (4) inch concrete with one-half (1/2) inch rebar two (2) foot on center each way or six (6) inches by six (6) inches by ten (10) inches welded wire. The above specifications shall also apply to detached garages.

R309.2. Delete the last sentence and insert in lieu thereof the following: The area of floor used for parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to the main vehicle entry doorway.

R309.4.1. Insert the following: R309.4.1. Pavilion: Pavilion structures shall be open on at least two (2) sides. If motorized equipment (vehicle, lawnmower, etc.) are stored underneath, the structure becomes a "Carport" and comes under the provisions of Section 309.2.

A R309.4.2. Insert the following: R309.4.2. Utility Buildings: Utility Buildings shall be located a minimum distance of fifty (50) feet from any residence. The structure is a "Garage" if any of the following apply: located closer than fifty (50) feet from any residence or if motorized equipment (vehicle, lawnmower, etc.) are stored inside this structure and shall be built under the provision of Sections 309 through 309.3. Exception: If structure is used strictly for agricultural use, stalls are installed within the structure, or if the structure is located on a parcel five (5) acres in size or larger.

R309.5. Delete and insert in lieu thereof the following: Fire sprinklers. Private garages may be protected by fire sprinklers where the garage wall has been designed based on Table 302.1(2), Footnote a, and the homeowner has opted to purchase a fire sprinkler system for their residence, as per Missouri Revised Statutes Section 67.281. Sprinklers in garages may be connected to an automatic sprinkler system that complies with Section P2904. Garage sprinklers may be residential sprinklers or quick-response sprinklers, designed to provide a density of 0.05 gpm/ft². Garage doors may not be considered obstructions with respect to sprinkler placement.

R309.6. Insert the following: R309.6. Accessory Structures: General: This Section shall apply to all pre-manufactured accessory structures with a minimum area of one hundred twenty (120) square feet to not exceed three hundred (300) square feet in size. Pre-manufactured accessory structures, or sheds, are factory-built units comprised of structural wood wall and floor panels. Due to the combustible nature of the floor composition, pre-manufactured accessory structures shall not be used to store hazardous materials, motor vehicles or heavy machinery.

R309.7. Insert the following: R309.7. Pre-Manufactured Accessory Structures Anchoring System: Accessory structures must be anchored into the ground to sufficiently withstand a ninety (90) mph wind. There are three (3) types of acceptable anchoring systems other than a full foundation with frost-protected footing.
1)	Slab. A minimum four (4) inches concrete with four (4) inches sub grade of suitably compacted materials. One-half (1/2) inch anchor bolts placed six (6) feet on center with three (3) inches minimum embedment in concrete.
2)	Auger Tie Down. Similar to manufactured home tie downs with a minimum of two percent (2%) side-max spacing ten (10) feet on center. See manufacturer's details on installation into the ground.
3)	Piers. Sheds built on four (4) by four (4) skids may be anchored into a concrete pier system. Piers shall be eight (8) inches by eight (8) inches by twelve (12) inches deep and shall be spaced a maximum of eight (8) feet on center. Piers shall be located directly under the structural floor frame of the shed.
Exception: With Planning and Zoning approval, a structure may be located closer than twelve (12) feet to another structure provided that the new structure is separated by a one-hour fire partition.

R311.2. Delete and insert in lieu thereof the following: Egress door. Not less than one (1) egress door shall be provided for each dwelling unit. The egress door shall be side-hinged, and shall provide a clear width of not less than thirty-six (36) inches where measured between the face of the door and the stop, with the door open ninety degrees (90°) (1.57 rad). The clear height of the door opening shall be not less than eighty (80) inches in height measured from the top of the threshold to the bottom of the stop. Other doors shall not be required to comply with these minimum dimensions. Egress doors shall be readily openable from inside the dwelling without the use of a key or special knowledge or effort.

R311.3. Delete and insert in lieu thereof the following: Floors and landings at exterior doors. There shall be a landing or floor at each required egress exterior door. The width of the landing shall not be less than the door served. The landing shall have a dimension of not less than thirty-six (36) inches (914 mm) measured in the direction of travel. The slope at an exterior landing shall not exceed one-fourth (1/4) unit vertical in twelve (12) units horizontal (two percent (2%)).

Exception: Exterior balconies less than sixty (60) square feet (5.6 m²) and only accessible from a door are permitted to have a landing less than thirty-six (36) inches (914 mm) measured in the direction of travel.

R311.3.2. Delete and insert in lieu thereof the following: Floor elevations for other exterior doors. Doors other than the required egress door shall be provided with landings or floors not more than seven and three-fourths (7 3/4) inches (196 mm) below the top of the threshold.
	Exception: A top landing is not required where a stairway of four (4) or fewer risers is located on the exterior side of the door, provided that door does not swing over the stairway.

R311.6.1. Insert the following: R311.6.1. Interior Passage Doors. The minimum width of an interior passage door shall be two (2) feet six (6) inches.
	Exception:
	Bathroom doors may be two (2) feet four (4) inches.

R311.7.5.1. Delete and insert in lieu thereof the following: Risers. Eight (8) inches

R311.7.5.2. Delete and insert in lieu thereof the following: Treads. Nine (9) inches
	Exceptions:
	1.	For remodeling projects in existing homes, homes in urban, in-fill or high-density developments, or historical buildings or dwellings, riser height of not more than eight and one-fourth (8 1/4) inches (210 mm) and tread depth of not more than nine (9) inches (229 mm) will be allowed.
	2.	For remodeling projects in existing homes, stair tread and riser will be allowed to mimic previous or existing conditions.

R311.7.6. Delete and insert in lieu thereof the following: Landings for stairways. There shall be a floor or landing at the top and bottom of each stairway. The width perpendicular to the direction of travel shall be not less than the width of the flight served. Landings of shapes other than square or rectangular shall be permitted provided the depth at the walk line and the total area is not less than that of a quarter circle with a radius equal to the required landing width. Where the stairway has a straight run, the depth in the direction of travel shall not be less than thirty-six (36) inches (914 mm).

Exception: A floor or landing is not required at the top of an interior or exterior flight of stairs, including stairs in an enclosed garage, provided that a door does not swing over the stairs.

R312.1.1. Delete and insert in lieu thereof the following: Where required. Guards shall be located along open-sided walking surfaces, including stairs, ramps and landings that are located more than thirty (30) inches (762 mm) measured vertically at the edge of the walking surface to the floor or grade below. Insect screening shall not be considered as a guard.

R312.2. Delete entire section.

R313.1. Delete and insert in lieu thereof the following: Townhouse automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed in townhouses, in accordance with Section 67.281 of the Missouri Revised Statutes.
	Exception: An automatic residential fire sprinkler system shall not be required where additions or alterations are made to existing townhouses that do not have an automatic residential fire sprinkler system installed.

R313.1.1. Delete and insert in lieu thereof the following: Design and installation. Automatic residential fire sprinkler systems for townhouses shall be designed and installed in accordance with Section P2904 or NFPA 13D.

R313.2. Delete and insert in lieu thereof the following: One- and two-family dwellings automatic fire systems. A builder of a single-family dwelling or residence or multi-unit dwellings of four (4) or fewer units shall offer to any purchaser on or before the time of entering into the purchase contract the option, at the purchaser's cost, to install or equip fire sprinklers in the dwelling, residence, or unit. Notwithstanding any other provision of law to the contrary, no purchaser of such a single-family dwelling, residence, or multi-unit dwelling shall be denied the right to choose or decline to install a fire sprinkler system in such dwelling or residence being purchased by any code, ordinance, rule, regulation, order, or resolution by any County or other political subdivision. Any County or other political subdivision shall provide in any such code, ordinance, rule, regulation, order, or resolution the mandatory option for purchasers to have the right to choose and the requirement that builders offer to purchasers the option to purchase fire sprinklers in connection with the purchase of any single-family dwelling, residence, or multi-unit dwelling of four (4) or fewer units.

Exception: An automatic residential fire sprinkler system shall not be required for additions or alterations to existing buildings that are not already provided with an automatic residential sprinkler system.

R313.2.1. Delete and insert in lieu thereof the following: Design and installation. Automatic residential fire sprinkler systems shall be designed and installed in accordance with Section P2904 or NFPA 13D.

R314.6. Delete and insert in lieu thereof the following: Power Source. Smoke alarms shall receive 120V/AC from the building wiring where such wiring is served from a commercial source and, where primary power is interrupted, shall receive power from a battery. Wiring shall be permanent and without a disconnecting switch other than those required for overcurrent protection.
	Exceptions:
	1.	Smoke alarms shall be permitted to be battery operated where installed in buildings without commercial power.
	2.	Smoke alarms installed in accordance with Section R314.2.2 shall be permitted to be battery powered.

R315.5. Delete and insert in lieu thereof the following: Power Source. Carbon monoxide alarms shall receive their power from the 120V/AC and interconnected with smoke alarms with battery backup. This shall only apply to a new home or where improvements defined as "substantial improvements" occur.

R323.1. Delete and insert in lieu thereof the following: General. This Section applies to storm shelters where constructed as separate detached buildings or where constructed as safe rooms within buildings for the purpose of providing refuge from storms that produce high winds, such as tornadoes and hurricanes. In addition to other applicable requirements in this code, storm shelters shall be constructed in accordance with ICC/NSSA-500, except when located below grade or if basement walls are fully constructed with concrete.

Table R403.1. Delete Table. (see Subsection 403.1.1 amendment)

R403.1.1. Delete and insert in lieu thereof the following: Minimum Size. All concrete footings shall have a minimum of two (2) one-half (1/2) inch rebar. The minimum size for all footings shall be eight (8) inches thick by sixteen (16) inches wide. In one- and two-family dwellings the minimum footing size shall be:
	Slab and crawl space one story	8" x 16"
	One story	8" x 20"
	One and one-half story	8" x 22"
	Two story	8" x 24"
******Add two (2) inches to width of footing for ten-inch walls********
Add two (2) inches to the width of the footing when a log home will be built. In all other buildings, the footing shall be designed to carry the load applied on it. All footings must have a key-way.

R403.1.7. Delete and insert in lieu thereof the following: Footings on or adjacent to slopes. The placement of buildings and structures on or adjacent to slopes steeper than one (1) unit vertical in three (3) units horizontal (33.3-percent slope) shall conform to Sections R403.1.7.1 through R403.1.7.4 or plans as signed and sealed by a registered engineer.

R403.3. Delete entire section.

Table R404.1.2(4). Delete and insert in lieu thereof the following:

Table R404.1.2(4)
Minimum Vertical Reinforcement For 10-Inch Nominal Flat Concrete Basement Walls^{b,c,d,e,f,h,i}
		Minimum Vertical Reinforcement — Bar Size And Spacing (inches) Soil Classes^a and design lateral soil (psf per foot of depth)
		GW, GM, GC, SC, ML-CL GP, SW, SM, SM-SC and inorganic SP and ML-CL
Minimum Unsupported Wall Height (feet)	Maximum Unbalanced Backfill Height^g (feet)	30	45	60
8	4	NR	NR	NR
	5	NR	NR	NR
	6	NR	NR	NR
	7	NR	NR	NR
	8	6@48	6@35	6@28
9	4	NR	NR	NR
	5	NR	NR	NR
	6	NR	NR	NR
	7	NR	NR	NR
	8	NR	NR	6@28
	9	6@37	6@28	6@24
10	4	NR	NR	NR
	5	NR	NR	NR
	6	NR	NR	NR
	7	NR	NR	6@28
	8	NR	6@28	6@28
	9	6@33	6@28	6@21
	10	6@28	6@23	6@17
For SI: 1 foot = 304.8 mm; 1 inch = 25.4 mm; 1 pound per square foot per foot = 0.1571 kPa²/m; 1 pound per square inch = 6.895kPa
a.	Soil classes are in accordance with the Unified Soil Classification System. Refer to Table R405.1.
b.	Table values are based on reinforcing bars with a minimum yield strength of sixty thousand (60,000) psi concrete with a minimum specified compressive strength of two thousand five hundred (2,500) psi and vertical reinforcement being located at the centerline of the wall. See Section R404.1.2.3.7.2.
c.	Vertical reinforcement with a yield strength of less than sixty thousand (60,000) psi and/or bars of a different size than specified in the table are permitted in accordance with Section R404.1.2.3.7.6 and Table R404.1.2(9).
d.	NR indicates no vertical reinforcement is required.
e.	Deflection criterion is L/240 where L is the height of the basement wall in inches.
f.	Interpolation is not permitted.
g.	Where walls will retain four (4) feet or more of unbalanced backfill, they shall be laterally supported at the top and bottom before backfilling.
h.	See Section R404.1.2.2 for minimum reinforcement required for basement walls supporting above grade concrete walls.
i.	See Table R611.3 for tolerance from nominal thickness permitted for flat walls. Table 404.1.2.(8) Delete Table and insert the following. See Table 404.1.2(8) at the end of this Chapter.[2]

R404.1.3.2. Delete and insert in lieu thereof the following: Reinforcement for foundation walls. Concrete foundation walls shall be laterally supported at the top and bottom. Horizontal reinforcement shall be provided in accordance with Table R404.1.2(1). Vertical reinforcement shall be provided in accordance with Table R404.1.2(2), R404.1.2(3), R404.1.2(4), R404.1.2(5), R404.1.2(6), R404.1.2(7) or R404.1.2(8). Vertical reinforcement for flat basement walls retaining four (4) feet (1,219 mm) or more of unbalanced backfill is permitted to be determined in accordance with Table R404.1.2(9). For basement walls supporting above-grade concrete walls, vertical reinforcement shall be the greater of that required by Tables R404.1.2(2) through R404.1.2(8) or by Section R608.6 for the above-grade wall. In buildings assigned to Seismic Design Category D0, D1 or D2, concrete foundation walls shall also comply with Section R404.1.4.2.

Exception: Where unstable soil or ground water conditions do not exist, concrete foundation walls may be constructed in accordance with Table R404.1.2(10).

TABLE R404.1.2(10). Insert the following:
Table R404.1.2(10) Concrete Foundation Walls
Maximum Wall Height	Maximum Depth of Unbalanced Backfill	Minimum Nominal Wall Thickness
7'-0"	6'-0" or less 7'-0"	8" 10" (Note a)
8'-0"	6'-0 or less 7'-0" 8'-0"	8" (Note a) 8" (Note a) 8" (Note a)
9'-0"	6'-0" or less 7'-0" 8'-0" 9'-0"	10" (Note b) 10" (Note b) 10" (Note b) 10" (Note b)

Note a:	Concrete foundation walls may be constructed a minimum of nominal eight (8) inches thick where the wall height from the top of the footing to the top of the wall does not exceed eight (8) feet. A minimum of two #4 reinforcing bars shall be placed horizontally in the top and bottom of the foundation wall. A minimum of two #5 reinforcing bars shall be provided around all window and door openings in concrete foundation and basement walls; bars shall extend a minimum of twenty-four (24) inches beyond the corners of the openings.
Note b:	Concrete foundation walls may be constructed a minimum of nominal ten (10) inches thick. A minimum of two #5 reinforcing bars shall be placed horizontally in the top, middle, and bottom of the foundation wall. A minimum of two #5 reinforcing bars shall be provided around all window and door openings in concrete foundation and basement walls; bars shall extend a minimum of twenty-four (24) inches beyond the corners of the openings.
	The concrete minimum nominal wall thickness shall be eight (8) inches for foundation walls in soil classes SC, MH, ML-CL and inorganic CL when the maximum wall height is eight (8) feet.
	The concrete minimum wall thickness shall be ten (10) inches for foundation walls in soil classes SC, MH, ML-CL and inorganic CL when the maximum wall height is nine (9) feet.
	The concrete minimum wall thickness shall be twelve (12) inches for foundation walls in soil classes SC, MH, ML-CL and inorganic CL when the maximum wall height is ten (10) feet.

R405. Delete entire section and insert in lieu thereof the following: R405 Foundation Drainage. An evaluation of the soil for the presence or absence of ground water is required. The evaluation report shall be based on either a subsurface soil investigation or satisfactory data from adjacent areas together with an inspection of the excavation prior to pouring concrete.

R405.1. No ground water present. Provide drain tile, perforated pipe, or other approved foundation drainage systems (such as water channel system) around perimeter of the outside of the foundation or inside the foundation. Drain discharge shall be by gravity to daylight or be connected to a basement floor sump.

R405.1.2. Filter Membranes. An approved filter membrane shall be placed over the top of the joints/pipe perforations. The tile/pipe shall be placed on two (2) inches minimum gravel or crushed stone and have six (6) inches minimum cover.

R405.1.3. Drainage system. The drainage system shall discharge by gravity to daylight or be connected to an approved sump (fifteen (15) inches in diameter x eighteen (18) inches deep with fitted cover). A sump pump shall be provided if basement is finished or partially finished with pump discharge by an approved method.

R405.1.4. Damp Proofing. Provide damp proofing of floor slab with a six (6) mil polyethylene film below slab, with joints in membrane lapped a minimum of six (6) inches and sealed.

R405.2. Ground water present. Provide drain tile, perforated pipe, or other approved foundation drainage systems (such as water channel system) around perimeter of the outside of the foundation or inside the foundation.

R405.2.1. Drainage System. Drainage system shall discharge by gravity to daylight or be connected to an approved sump (fifteen (15) inches in diameter x eighteen (18) inches deep with fitted cover) having a sump pump that discharges into an approved disposal system or to daylight.

R507.2.4. Delete entire section.

R602.7.5. Delete entire section.

R602.3. Insert the following: Exception #2 Headers can be on top of an opening in a wall.

R602.3.1. Delete the first sentence and insert in lieu thereof: The size, height and spacing of studs shall be spaced no more than sixteen (16) inches on center.

Table 602.3.(1). Insert in #35 Number and Type of Fastener the following: or 1 1/8" screws, pan head or button head. Insert in #36 Number and Type of Fastener the following: or 1 1/4" screws, pan head or button head.

Table R602.3(3). Delete the number 24 from Maximum Wall Stud Spacing and insert in lieu thereof the following: 16.

FIGURE R602.10.10.3. Insert the following:

FIGURE R602.10.10.3

SIMPLIFIED PORTAL WALL

CRIPPLE WALL FRAMING CONSISTING OF STUD FRAMING, SINGLE BOTTOM PLATE, AND DOUBLE TOP PLATE MAY BE ADDED TO THE TOP OF THE NARROW PORTAL WALL AS LONG AS THE COMBINED HEIGHT OF THE TWO (2) WALLS IS LESS THAN OR EQUAL TO TWELVE (12) FEET AND THE TWO (2) WALLS ARE STRAPPED TOGETHER ON THE INTERIOR SIDE WITH A 16 GUAGE METAL ONE AND ONE-HALF (1 1/2) INCH WIDE BY TWENTY-ONE (21) INCH LONG STRAP. A MINIMUM TEN (10) INCHES OF THE STRAP SHALL BE CONNECTED TO EACH WALL OR GABLE TRUSS WITH 9 - 16D NAILS FOR A TOTAL OF 18 - 16D NAILS IN THE ENTIRE STRAP. STRAPS SHALL BE LOCATED AT EACH END OF THE CONNECTED WALLS OR WALL AND GABLE TRUSS WHERE SPACE ALLOWS FOR THE TEN (10) INCH LENGTH OF STRAP. THE SPACING BETWEEN THE STRAPS MAY NOT EXCEED FOUR (4) FEET ON CENTER. THE STRAPS SHALL NOT BE BENT HORIZONTALLY TO ACCOMMODATE WOOD FRAMING. IF APPLICABLE, NAILERS SHALL BE ADDED TO ONE (1) OF THE WALLS OR GABLE END USING A MINIMUM OF 9 - 16D NAILS TO CREATE THE VERTICAL PLANE NEEDED TO MOUNT THE STRAP.

FIGURE R602.10.10.4. Insert the following:


FIGURE R602.10.10.4
SIMPLIFIED BRACING EXTERIOR CORNER FRAMING
a.	END STUD INDICATED ON THE ABOVE DETAILS MAY BE SHIFTED 7/16" TO ALLOW STUD FACE TO BE ALIGNED WITH SHEATHING, OR AN OPTIONAL NON-STRUCTURAL FILLER PANEL MAY BE USED.

R602.12. Delete and insert in lieu thereof the following: Simplified wall bracing. Buildings meeting all of the conditions listed below shall be permitted to be braced in accordance with this Section as an alternate to the requirements of Section R602.10. The entire building shall be braced in accordance with this Section; the use of other bracing provisions of Section R602.10, except as specified herein, shall not be permitted.
	1.	There shall be not more than three (3) stories above the top of a concrete or masonry foundation or basement wall. Permanent wood foundations shall not be permitted.
	2.	Floors shall not cantilever more than twenty-four (24) inches (607 mm) beyond the foundation or bearing wall below.
	3.	Wall height shall not be greater than a nominal twelve (12) feet when using the minimum required bracing lengths specified in Table 602.12.4.
		Exception: Structural calculations and details are not required when there are no braced wall panels in that portion of a wall where the height exceeds a nominal twelve (12) feet and that greater wall height segment is part of a prescriptive braced wall line on each of the adjacent stories.
	4.	The building shall have a roof eave-to-ridge height of fifteen (15) feet (4,572 mm) or less.
	5.	Exterior walls shall have gypsum board with a minimum thickness of one-half (1/2) inch (12.7 mm) installed on the interior side fastened in accordance with Table R702.3.5.
		Exception: Gypsum board is not required for wall bracing on exterior walls in garages.
	6.	The structure shall be located where the ultimate design wind speed is less than or equal to 130 mph (58 m/s), and the exposure category is B or C.
	7.	The structure shall be located in Seismic Design Category A, B or C for detached one- and two-family dwellings or Seismic Design Category A, B or C for townhouses.
	8.	Cripple walls shall not be permitted in three-story buildings.

602.12.1. Delete and insert in lieu thereof the following: Circumscribed rectangle. The bracing required for each building shall be determined by circumscribing a rectangle around the entire building on each floor as shown in Figure 602.12.1. The rectangle shall surround all enclosed offsets and projections such as sunrooms and attached garages. Open structures, such as carports and decks, shall be permitted to be excluded. The rectangle shall not have a side greater than sixty (60) feet (18,288 mm), and the ratio between the long side and short side shall not be greater than 3:1.

R602.12.2. Delete and insert in lieu thereof the following: Sheathing materials. The following sheathing materials installed on the exterior side of exterior walls shall be used to construct a bracing unit as defined in Section R602.12.3. Mixing materials is prohibited.
	1.	Wood structural panels with a minimum thickness of seven-sixteenth (7/16) inch fastened in accordance with Table R602.3(3).
	2.	Structural fiberboard sheathing with a minimum thickness of one-half (1/2) inch (12.7 mm) fastened in accordance with Table R602.3(1).

R602.12.3. Delete and insert in lieu thereof the following: Bracing unit. A bracing unit shall be a full-height sheathed segment of the exterior wall without openings or vertical or horizontal offsets and a minimum length as specified herein. Interior walls shall not contribute toward the amount of required bracing. Mixing of Items 1 and 2 is prohibited on the same story.
	1.	Where all framed portions of all exterior walls are sheathed in accordance with Section R602.12.2, including wall areas between bracing units, above and below openings and on gable end walls, the minimum length of a bracing unit shall be three (3) feet (914 mm). For walls with heights greater than a nominal ten (10) feet, the minimum length of a bracing unit shall be four (4) feet (1,219 mm).
	2.	Where the exterior walls are braced with sheathing panels in accordance with Section R602.12.2 and areas between bracing units are covered with other materials, the minimum length of a bracing unit shall be four (4) feet (1,219 mm).

R602.13. Insert the following: Alternate simplified bracing method for one- and two-family dwellings when the entire structure is sheathed with wood structural panels and located in wind exposure A or B. The construction documents shall detail the locations and widths of all braced wall panels in accordance with this Section.

R602.13.1. Insert the following: Wood structural sheathing. The building exterior walls shall be sheathed with seven-sixteenth (7/16) inch (11.1 mm) or thicker plywood or OSB wood structural panels. The wood structural panels shall be applied to all exterior walls, gable ends and band boards. All vertical joints between panels shall be blocked. Horizontal joints in braced wall panels shall be blocked.

R602.13.2. Insert the following: Braced wall panel locations. Braced wall panels shall be located in every exterior braced wall line in accordance with the following criteria:
	1.	The outside edge of the first braced wall panel meeting the width established in Table R602.13.3 shall be a maximum of twelve and five tenths (12.5) feet (3,810 mm) or less from each end of the braced wall line. The outside stud of the first braced wall panels closest to the end of the braced wall line shall be secured with a hold-down device securing the end stud to the foundation with a minimum uplift design value of eight hundred (800) pounds.
		Exception: The eight hundred (800) pound hold-down device is not required when the braced wall panel is placed at the end of the braced wall line and there is a twenty-four (24) inch (610 mm) wide full height sheathed wall placed ninety degrees (90°) to the end of the braced wall line and panel.
	2.	The centerline spacing of braced wall panels in a braced wall line may not exceed twenty-five (25) feet (7,620 mm).

R602.13.3. Insert the following: Braced wall panel widths. Braced wall panel locations shall be shown on the floor plans or elevation views and meet the widths established in Table R602.13.3.

TABLE R602.13.3. Insert the following:

Table 602.13.3
Simplified Bracing Panel Widths
		Width of Solid Panel^{a, b}
			8' wall height	9' wall height	10' wall height	12' wall height
Plywood/OSB Panel		3:1	32"	36"	40"	48"
Simplified Portal Wall^c		6:1	16"^d	18"^d	20"^d	24"^d
a.	Linear interpolation is permitted.
b.	Wall height is the vertical distance from the bottom of the sole/sill plate to the top of the double top plate. An additional two (2) inch (50.8 mm) variation in height is allowed for pre-cut stud framing.
c.	The Simplified Portal Wall, if applicable, shall be constructed in accordance with the applicable detail in Figure R602.13.3. The designer shall provide this detail on the construction documents.
d.	The Simplified Portal Wall width assumes the beam is placed under the top plate of the wall. A smaller width may be calculated for a lower top of beam height using the 6:1 height to width ratio.

R602.13.4. Insert the following: Corner framing. The exterior wall corners shall be constructed in accordance with the applicable detail in Figure R602.10.10.4.
	Exception: Braced wall panels located in accordance with Section R602.13.2.

R602.13.5. Insert the following: Braced wall line spacing. When the perpendicular distance between the exterior braced wall lines exceeds fifty (50) feet (15,240 mm), the registered design professional shall include the following certification on the drawings: The interior and exterior wall configuration braces for the structure in accordance with or equivalent to the lateral bracing provisions of Section R602.10 of the International Residential Code, 2009 Edition or Section 2305 of the International Building Code, 2009 Edition.

R602.13.6. Insert the following: Maximum wall height. Walls greater than twelve (12) feet (3,658 mm) (twelve (12) feet two (2) inches (3,708 mm) actual) in height and twelve (12) feet (3,658 mm) in width shall be designed and detailed by the registered design professional to resist wind loads in both the longitudinal and transverse directions.

R905.2.8.2. Delete and insert in lieu thereof the following: Valleys. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Valley linings of the following types shall be permitted:
	1.	For open valleys (valley lining exposed) lined with metal, the valley lining shall be not less than twenty-four (24) inches (610 mm) wide and of any of the corrosion-resistant metals in Table R905.2.8.2.
	2.	For open valleys, valley lining of two plies of mineral-surfaced roll roofing, complying with ASTM D 3909 or ASTM D 6380 Class M, shall be permitted. The bottom layer shall be eighteen (18) inches (457 mm) and the top layer not less than thirty-six (36) inches (914 mm) wide.
	3.	For closed valleys (valley covered with shingles), valley lining of two ply of No. 15 felt complying with ASTM D 226 Type I, ASTM D 4869 Type I, or ASTM D 6757, or valley lining as described in Item 1 and 2 shall be permitted. Self-adhering polymer modified bitumen underlayment complying with ASTM D 1970 shall be permitted in lieu of the lining material.

R905.2.8.5. Delete entire section.

R1005.7. Delete and insert in lieu thereof the following: Factory-built chimney offsets. Where a factory-built chimney assembly incorporates offsets, no part of the chimney shall be at an angle of more than thirty degrees (30°) (0.52 rad) from vertical at any point in the assembly and the chimney assembly shall not include more than four (4) elbows.
	Exception: When chimneys are installed per manufacturer's installation instructions.

R1006.1.1. Delete and insert in lieu thereof the following: Factory-built fireplaces. Exterior combustion air ducts for factory-built fireplaces shall be a listed component of the fireplace or equivalent and shall be installed according to the fireplace manufacturer's instructions.

R1006.2. Delete and insert in lieu thereof the following: Exterior air intake. The exterior air intake on masonry fireplaces shall be capable of supplying combustion air from the exterior of the dwelling or from spaces within the dwelling ventilated with outdoor air such as non-mechanically ventilated crawl or attic spaces. The exterior air intake shall not be located within the garage or basement of the dwelling. The exterior air intake, for other than listed factory-built fireplaces, shall not be located at an elevation higher than the firebox. The exterior air intake shall be covered with a corrosion-resistant screen of one-fourth (1/4) inch (6.4 mm) mesh.

N1101.4 (R102.1.1). Delete and insert in lieu thereof the following: Above code programs. The building official or other authority having jurisdiction shall be permitted to deem a national, state or local energy-efficiency program to exceed the energy efficiency required by this code. Buildings approved in writing by such an energy-efficiency program shall be considered in compliance with this code.

N1101.5 (R103.2). Delete entire section.

N1101.5.1 (R103.2.1). Delete entire section.

N1101.6 (R202). Defined terms. PROJECTION FACTOR. Delete and insert in lieu thereof the following: PROJECTION FACTOR. The ratio of the horizontal depth of an overhang, eave, or permanently attached shading device, divided by the distance measured vertically from the bottom of the fenestration glazing to the underside of the overhang, eave, or permanently attached shading device.

N1101.13 (R401.2). Delete and insert in lieu thereof the following: Compliance. Projects shall comply with one (1) of the following:
	1.	Sections N1101.14 through N1104 as amended.
	2.	Section N1105 and the provisions of Sections N1101.14 through N1104 labeled "Mandatory."
	3.	An energy rating index (ERI) approach in Section N1106.

N1101.14 (R401.3). Delete entire section.

TABLE N1102.1.2 (R402.1.2). Delete and insert in lieu thereof the following:

Table N1102.1.2 (R402.1.2)
Climate Zone	Fenestra-tion U-Factor^b	Skylight^b U-Factor	Glazed Fenestra-tion SHGC^b,c	Ceiling R-Value	Wood Frame Wall R-Value	Mass Wall R-Valueⁱ	Floor R-Value	Base-ment ^c Wall R-Value	Slab^d R-Value & Depth	Crawl Space^c Wall R-Value
1	NR	0.75	0.25	30	13	3/4	13	0	0	0
2	0.40	0.65	0.25	38	13	4/6	13	0	0	0
3	0.35	0.55	0.25	38	20 or 13 + 5^h	8/13	19	5/13^f	0	5/13
4 except Marine	0.40	0.55	NR	38	13	8/13	19	0^j	10, 2 ft	10/13
5 and Marine 4	0.32	0.55	NR	49	20 or 13 + 5^h	13/17	30^g	15/19	10, 2 ft	15/19
6	0.32	0.55	NR	49	20 + 5 or 13 + 10^h	15/20	30^g	15/19	10, 4 ft	15/19
7 and 8	0.32	0.55	NR	49	20 + 5 or 13 + 10^h	19/21	38^g	15/19	10, 4 ft	15/19

For SI: 1 foot = 304.8mm.
	a.	R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed R-value of the insulation shall not be less than the R-value specified in the table.
	b.	The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. Exception: Skylights may be excluded from glazed fenestration SHGC requirements in Climate Zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.
	c.	"15/19" means R-15 continuous insulation on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. "15/19" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the home. "10/13" means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.
	d.	R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or two (2) feet, whichever is less in Zones 1 through 3 for heated slabs.
	e.	There are no SHGC requirements in the Marine Zone.
	f.	Basement wall insulation is not required in warm-humid locations as defined by Figure N1101.10 or Table N1101.10.
	g.	Or insulation sufficient to fill the framing cavity, R-19 minimum.
	h.	The first value is cavity insulation, the second value is continuous insulation, so "13+5" means R-13 cavity insulation plus R-5 continuous insulation.
	i.	The second R-value applies when more than half of the insulation is on the interior of the mass wall.
	j.	Exception: Unfinished concrete basement walls do not require insulation.

N1102.1.3. (R402.1.3). Delete and insert in lieu thereof the following: R-value computation. Insulation material used in layers, such as framing cavity insulation, or continuous insulation shall be summed to compute the corresponding component R-value. The manufacturer's settled R-value shall be used for blown insulation. Computed R-values may include an R-value for other building materials or air films. Where insulated siding is used for the purpose of complying with the continuous insulation requirements of Table N1102.1.2, the manufacturer's labeled R-Value for insulated siding shall be reduced by R-0.6.

N1102.1.5 (R402.1.5). Delete and insert in lieu thereof the following: Total UA alternative. If the total building envelope UA (sum of U-factor times assembly area) is less than or equal to the total UA resulting from using the U-factors in Table N1102.1.4 (multiplied by the same assembly rea as in the proposed building), the building shall be considered in compliance with Table N1102.1.2. The UA calculation shall be done using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. The SHGC requirements shall be met in addition to UA compliance.
	Exception:
	Glazed fenestration SHGC. In Climate Zone 4, permanently shaded vertical fenestration shall be permitted to satisfy SHGC requirements. The projection factor of an overhang, eave, or permanently attached shading device shall be greater than or equal to the value listed in Table N1102.1.5 for the appropriate orientation. The minimum projection shall extend beyond each side of the glazing a minimum of twelve (12) inches. Each orientation shall be rounded to the nearest cardinal orientation (+/- 45 degrees or 0.79 rad) for purposes of calculations and demonstrating compliance.

TABLE N1102.1.5. Insert the following:

Table N1102.1.5
Minimum Projection Factor Required by Orientation for SHGC Exception
Orientation		Projection Factor
North		>=0.40^a
South		>=0.20
East		>=0.50
West		>=0.50
a.	For the north orientation, a vertical projection located on the west-edge of the fenestration with the equivalent of PF>=0.15 shall also satisfy the minimum projection factor requirement.

N1102.2.4 (R402.2.4). Delete and insert in lieu thereof the following: Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces such as attics and crawl spaces shall be insulated to a level equivalent to the insulation on the surrounding surfaces. Access shall be provided to all equipment that prevents damaging or compressing the insulation. A wood-framed or equivalent baffle or retainer is required to be provided when loose-fill insulation is installed, the purpose of which is to prevent the loose-fill insulation from spilling into the living space when the attic access is opened, and to provide the permanent means of maintaining the installed R-value of the loose-fill insulation.

Exception: Vertical doors that provide access from the conditioned to unconditioned spaces shall be permitted to meet the fenestration requirements of Table R1102.1.2 based on the applicable climate zone specified in Chapter 3.

N1102.4 (R402.4). Delete and insert in lieu thereof the following: Air leakage. The building thermal envelope may be designed and constructed to limit air leakage in accordance with the requirements of Sections R1102.4.1 through R1102.4.4.

N1102.4.1 (R402.4.1). Delete and insert in lieu thereof the following: Building thermal envelope. The building thermal envelope shall comply with Sections N1102.4.1.1 and N1102.4.1.2. The sealing methods between dissimilar materials shall allow for differential expansion and contraction.

N1102.4.1.1 (R402.4.1.1). Delete and insert in lieu thereof the following: Installation. The components of the building thermal envelope as listed in Table N1102.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria listed in Table N1102.4.1.1, as applicable to the method of construction. Where required by the building official, an approved third party shall inspect all components and verify compliance.

N1102.4.1.2 (R402.4.1.2). Delete and insert in lieu thereof the following: Testing. Any building or dwelling unit may be tested and verified as having an air leakage rate of not exceeding five (5) air changes per hour in Climate Zone 4. Testing shall be conducted in accordance with ASTM E 779 or ASTM E 1827 and reported at a pressure of two tenths (0.2) inches w.g. (50 Pascals'). Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope. During testing:
	1.	Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weather-stripping or other infiltration control measures.
	2.	Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures.
	3.	Interior doors, if installed at the time of the test, shall be open.
	4.	Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.
	5.	Heating and cooling systems, if installed at the time of the test, shall be turned off.
	6.	Supply and return registers, if installed at the time of the test, shall be fully open.

TABLE N1102.4.1.1 (402.4.1.1). Delete entire table.

N1102.4.2 (R402.4.2). Delete entire section.

N1102.4.4 (R402.4.4). Delete and insert in lieu thereof the following: Rooms containing fuel-burning appliances. In Climate Zones 3 through 8, where open combustion air ducts provide combustion air to open combustion fuel-burning appliances, the appliances and combustion air opening shall be located outside the building thermal envelope or enclosed in a room, isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table N1102.1.2, where the walls, floors and ceilings shall meet a minimum of the basement wall R-value requirement. The door into the room shall be fully gasketed and any water lines and ducts in the room insulated in accordance with Section N1103. The combustion air duct shall be insulated where it passes through conditioned space to a minimum of R-8.
	Exceptions:
	1.	Direct vent appliances with both intake and exhaust pipes installed continuous to the outside.
	2.	Fireplaces and stoves complying with Sections N1102.4.2 and R1006.
	3.	Mechanical equipment in an unfinished space.

N1102.4.5 (R402.4.5). Delete and insert in lieu thereof the following: Recessed lighting. Recessed luminaires installed in the building thermal envelope may be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires may be IC-rated and labeled as having an air leakage rate not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires may be sealed with a gasket or caulk between the housing and interior wall or ceiling covering.

N1103.1.1 (R403.1.1). Delete entire section.

N1103.2 (R403.2). Delete entire section.

N1103.3.1. (R403.3.1). Delete and insert in lieu thereof the following: Insulation. Supply and return ducts in unconditioned spaces shall be insulated to a minimum of R-4.

N1103.3.2 (R403.3.2). Delete and insert in lieu thereof the following: Sealing. Ducts, air handlers and filter boxes shall be sealed. Joints and seams shall comply with either the International Mechanical Code or Section M1601.4.1 of this code, as applicable.
	Exceptions:
	1.	Air-impermeable spray foam products shall be permitted to be applied without additional joint seals.
	2.	Continuously welded and locking-type longitudinal joints and seams in ducts operating at static pressure less than two (2) inches of water column (500 Pa) pressure classification shall not require additional closure systems.

N1103.3.3 (R403.3.3). Delete entire section.

N1103.3.4. (R403.3.4). Delete entire section.

N1103.3.5 (R403.3.5). Delete entire section.

N1103.4.1 (R403.4.1). Delete entire section.

N1103.5.3 (R405.5.3). Delete and insert in lieu thereof the following: Hot water pipe insulation (Prescriptive). Insulation for hot water pipe with a minimum thermal resistance (R-value) of R-3 shall be applied to the following:
	1.	Piping larger than three fourths (3/4) inch (19 mm) in nominal diameter.
	2.	Piping serving more than one (1) dwelling unit.
	3.	Piping located outside the conditioned space.
	4.	Piping from the water heater to a distribution manifold.
	5.	Piping located under a floor slab.
	6.	Buried in piping.
	7.	Supply and return piping in recirculation systems other than demand recirculation systems.

N1103.6 (R403.6). Delete and insert in lieu thereof the following: Mechanical ventilation. The building may be provided with ventilation that meets the requirements of Section M1507 of this code or the International Mechanical Code, as applicable, or with other approved means of ventilation. Outdoor air intakes and exhausts may have automatic or gravity dampers that close when the ventilation system is not operating.

Exception: Existing mechanical systems being replaced do not require mechanical ventilation.

N1103.6.1 (R403.6.1). Delete entire section.

TABLE N1103.6.1 (R403.6.1). Delete entire table.

N1103.7 (R403.7). Delete and insert in lieu thereof the following: Equipment sizing and efficiency rating (Mandatory). Heating and cooling equipment shall be sized in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. New or replacement heating and cooling equipment shall have an efficiency rating equal to or greater than the minimum required by Federal law for the geographic location where the equipment is installed.

N1104 (R404). Delete entire section.

N1104.1 (R404.1). Delete entire section.

N1104.1.1 (R404.1.1). Delete entire section.

Table N1105.5.2(1) [R405.5.2(1)]. Delete and insert in lieu thereof the following:

Table N1105.5.2(1) [R405.5.2(1)]
Specifications for the Standard Reference and Proposed Designs
Building Component	Standard Reference Design	Proposed Design
Above-grade walls	Type: mass walls if proposed wall is mass; otherwise wood frame	As proposed
	Gross area: same as proposed	As proposed
	U-factor: as specified in Table N1102.1.4	As proposed
	Solar absorptance = 0.75	As proposed
	Remittance = 0.90	As proposed
Basement and crawl space walls	Type: same as proposed	As proposed
	Gross area: same as proposed	As proposed
	U-factor: from Table N1102.1.4, with insulation layer on interior side of walls	As proposed
Above-grade floors	Type: wood frame	As proposed
	Gross area: same as proposed	As proposed
	U-factor: as specified in Table N1102.1.4	As proposed
Ceilings	Type: wood frame	As proposed
	Gross area: same as proposed	As proposed
	U-factor: as specified in Table N1102.1.4	As proposed
Roofs	Type: composition shingle on wood sheathing	As proposed
	Gross area: same as proposed	As proposed
	Solar absorption = 0.75	As proposed
	Emittance = 0.90	As proposed
Attics	Type: vented with aperture = 1 ft² per 300 ft² ceiling area	As proposed
Foundations	Type: same as proposed	As proposed
Foundations	Foundation wall area above and below grade and soil characteristics: same as proposed	As proposed
Opaque doors	Area: 40 ft²	As proposed
	Orientation: North	As proposed
	U-factor: same as fenestration from Table N1102.1.4	As proposed
Vertical fenestration other than opaque doors	Total area^b = a) fifteen percent (15%) of the conditioned floor area.	As proposed
	Orientation: equally distributed to four cardinal compass	As proposed orientations (N, E, S & W)
	U-factor: as specified in Table N1102.1.4	As proposed
	SHGC: as specified in Table N1102.1.2 except that for climates with no requirement (NR) SHGC = 0.40 shall be used	As proposed
	Interior shade fraction: 0.92 - (0.21 x SHGC for the standard reference design)	0.92 - (0.21 x SHGC as proposed)
	External shading: none	As proposed
Skylights	None	As proposed
Thermally isolated sunrooms	None	As proposed
Air exchange rate	Air leakage rate of five (5) air changes per hour in Climate Zone 4. The mechanical ventilation rate shall be in addition to the air leakage rate and the same as in the proposed design, but no greater than 0.01 x CFA + 7.5 x (N_br + 1) where: CFA = conditioned floor area N_br = number of bedrooms Energy recovery shall not be assumed for mechanical ventilation	For residences that are not tested, the same air leakage rate as the standard reference design. For tested residences, the measured air exchange rate^a. The mechanical ventilation rate^b shall be in addition to the air leakage rate and shall be proposed.
Mechanical ventilation	None, except where mechanical ventilation is specified by the proposed design, in which case: Annual vent fan energy use: kWh/yr = 0.03942 x CFA + 29.565 x (N_br + 1) where: CFA = conditioned floor area N^br = number of bedrooms	As proposed
Internal gains	1 Gain = 17,900 + 23.8 x CFA + 4104 x N_br (Btu/day per dwelling unit)	Same as standard reference design.
Internal mass	An internal mass for furniture and contents of 8 pounds per square foot of floor area	Same as standard reference design, plus any additional mass specifically designed as a thermal storage element^c but not integral to the building envelope or structure.
Structural mass	For masonry floor slabs, 80% of floor area covered by R-2 carpet and pad, and 20% of floor directly exposed to room air	As proposed
	For masonry basement walls, as proposed, but with insulation required by Table R402.1.4 located on the interior side of the walls	As proposed
	For other walls, for ceilings, floors, and interior walls, wood frame construction	As proposed
Heating systems^{d, e}	Fuel type: same as the proposed design Efficiencies: Electric: air-source heat pump with prevailing Federal minimum standards Nonelectric Furnaces: natural gas furnace with prevailing Federal minimum standards Nonelectric boilers: natural gas boiler with prevailing Federal minimum standards Capacity: sized in accordance with Section N1103.7	As proposed
Cooling systems^{d, f}	Fuel type: electric Efficiency: in accordance with prevailing Federal minimum standards Capacity: sized in accordance with Section N1103.7
Service water heating^{d, e, f}	Fuel type: same as proposed design Efficiency: in accordance with prevailing Federal minimum standards Use: gal/day = 30 + 10 x N_br Tank temperature: 120° F.	As proposed standard reference
Thermal distribution systems	Duct insulation: from Section N1103.2.1 A thermal distribution system efficiency (DSE) of 0.88 shall be applied to both the heating and cooling system efficiencies for all systems other than tested duct systems. For tested duct systems, the leakage rate shall be 4 cfm (113.3 L/min) per 100 ft² (9.29 m²) of conditioned floor area at a pressure of differential of one tenths (0.1) inches w.g. (25 Pa)	As tested or specified in Table R405.5.2(2) if not tested. Duct insulation shall be as proposed.
Thermostat	Type: Manual, cooling temperature set point = 75° F.; Heating temperature set point = 72° F.	Same as standard reference

For SI:1 square foot = 0.93 m², 1 British thermal unit = 1055 J, 1 pound per square foot = 4.88 kg/m², 1 gallon (US) = 3.785 L, ° C. = (° F.-32)/1.8, 1 degree = 0.79 rad
	a.	Where required by the code official, testing shall be conducted by an approved party. Hourly calculations as specified in the ASHRAE Handbook of Fundamentals, or the equivalent shall be used to determine the energy loads resulting from infiltration.
	b.	The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with Equation 43 of 2001 ASHRAE Handbook of Fundamentals, page 26.24 and the "Whole-House Ventilation" provisions of 2001 ASHRAE Handbook of Fundamentals, page 26.19 for intermittent mechanical ventilation.
	c.	Thermal storage element shall mean a component not part of the floors, walls or ceilings that is part of a passive solar system, and that provides thermal storage such as enclosed water columns, rock beds, or phase-change containers. A thermal storage element must be in the same room as fenestration that faces within fifteen degrees (15°) (0.26 rad) of true south, or must be connected to such a room with pipes or ducts that allow the element to be actively charged.
	d.	For a proposed design with multiple heating, cooling or water heating systems using different fuel types, the applicable standard reference design system capacities and fuel types shall be weighted in accordance with their respective loads as calculated by accepted engineering practice for each equipment and fuel type present.
	e.	For a proposed design without a proposed heating system, a heating system with the prevailing Federal minimum efficiency shall be assumed for both the standard reference design and proposed design.
	f.	For a proposed design home without a proposed cooling system, an electric air conditioner with the prevailing Federal minimum efficiency shall be assumed for both the standard reference design and the proposed design.
	g.	For a proposed design with a non-storage-type water heater, a 40-gallon storage-type water heater with the prevailing Federal minimum energy factor for the same fuel as the predominant heating fuel type shall be assumed. For the case of a proposed design without a proposed water heater, a 40-gallon storage-type water heater with the prevailing Federal minimum efficiency for the same fuel as the predominant heating fuel type shall be assumed for both the proposed design and standard reference design.

M1301.2. Delete entire section.

M1301.3. Delete entire section.

M1301.4. Delete entire section.

M1301.5. Delete entire section.

M1305.1.4.1. Delete and insert in lieu thereof the following: Ground clearance. Equipment and appliances supported from the ground shall be level and firmly supported on a concrete slab or other approved material extending not less than two (2) inches (50.8 mm) above the adjoining ground. Such support shall be in accordance with the manufacturer's installation instructions. Appliances suspended from the floor shall have a clearance of not less than six (6) inches (152 mm) from the ground.

M1305.1.4.3. Delete and insert in lieu thereof the following: Electrical requirements. A luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be installed at or near the appliance location in accordance with Chapter 39. Exposed lamps shall be protected from damage by location or lamp guards.
	Exception: Basements

M1307.2. Delete and insert in lieu thereof the following: Anchorage of appliances. Appliances designed to be fixed in position shall be fastened or anchored in an approved manner. In Seismic Design Categories D0, D1 and D2, water heaters and thermal storage units shall be anchored or strapped to resist horizontal displacement caused by earthquake motion in accordance with one (1) of the following:
	1.	Anchorage and strapping shall be designed to resist a horizontal force equal to one-third (1/3) of the operating weight of the water heater storage tank, acting in any horizontal direction. Strapping shall be at points within the upper one-third (1/3) and lower one-third (1/3) of the appliance's vertical dimensions. At the lower point, the strapping shall maintain a minimum distance of four (4) inches (102 mm) above the controls.
	2.	The anchorage strapping shall be in accordance with the appliance manufacturer's recommendations.
		Exception: Furnaces and air conditioners replaced in existing structures that were not built to seismic codes are not required to be seismically anchored.

M1401.3. Delete and insert in lieu thereof the following: Equipment and appliance sizing. Heating and cooling equipment and appliances shall be sized in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies.
	Exception: Heating and cooling equipment and appliance sizing shall not be limited to the capacities determined in accordance with Manual S where either of the following conditions applies:
	1.	The specified equipment or appliance utilizes multistage technology or variable refrigerant flow technology and the loads calculated in accordance with the approved heating and cooling calculation methodology is within the range of the manufacturer's published capacities for that equipment or appliance.
	2.	The specified equipment or appliance manufacturer's published capacities cannot satisfy both the total and sensible heat gains calculated in accordance with the approved heating and cooling calculation methodology and the next larger standard size unit is specified.

M1411.3.1. Delete and insert in lieu thereof the following: Auxiliary and secondary drain systems. In addition to the requirements of Section M1411.3, a secondary drain or auxiliary drain pan shall be required for each cooling or evaporator coil where damage to any building components will occur as a result of overflow from the equipment drain pan or stoppage in the condensate drain piping. Such piping shall maintain a minimum horizontal slope in the direction of discharge or not less than 1/8-unit vertical in twelve (12) units' horizontal (one-percent slope). Drain piping shall be not less than 3/4-inch (19 mm) nominal pipe size. One (1) of the following methods shall be used:
	1.	An auxiliary drain pan with a separate drain shall be installed under the coils on which condensation will occur. The auxiliary pan drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The pan shall have a minimum depth of one and five tenths (1.5) inches (38 mm), shall be not less than three (3) inches (76 mm) larger than the unit or the coil dimensions in width and length and shall be constructed of corrosion-resistant material. Galvanized sheet steel pans shall have a minimum thickness of not less than (No. 26 Gage). Non-metallic pans shall have a minimum thickness of not less than 0.0625 inch (1.6 mm).

M1501.1. Delete and insert in lieu thereof the following: Outdoor discharge. The air removed by every mechanical exhaust system shall be discharged to the outdoors in accordance with Section M1506.2. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
	Exceptions:
	1.	Whole-house ventilation-type attic fans that discharge into the attic space of dwelling units having private attics shall be permitted.
	2.	Bathroom exhaust may discharge to an attic gable vent or ventilated soffit.

M1502.4.1. Delete and insert in lieu thereof the following: Material and size. Exhaust ducts be constructed of metal having a minimum thickness of 0.0157 inch (0.3950 mm) (No. 30 gage). The duct shall be four (4) inches (102 mm) nominal in diameter.

M1502.4.2. Delete and insert in lieu thereof the following: Duct installation. Exhaust ducts shall be supported at intervals not to exceed twelve (12) feet (3,658 mm) and shall be secured in place. The insert end of the duct shall extend into the adjoining duct or fitting in the direction of airflow. Exhaust duct joints shall be sealed in accordance with Section M1601.4.1.

M1502.4.5.1. Delete and insert in lieu thereof the following: Specified length. The maximum length of the exhaust duct shall be thirty five (35) feet (10,688 mm) from the connection to the transition duct from the dryer to the outlet terminal. Where fittings are used, the maximum length of the exhaust duct shall be reduced in accordance with Table M1502.4.5.1. The maximum length of the exhaust duct does not include the transition duct.

Exception: The maximum developed length may be extended to fifty-five (55) feet if clearly labeled cleanouts are provided within twelve (12) inches of the second elbow, at every elbow thereafter, and at least every fifteen (15) feet of developed length thereafter.

M1503.4. Delete and insert in lieu thereof the following: Makeup air required. Exhaust hood systems capable of exhausting in excess of six hundred (600) cubic feet per minute shall be mechanically or naturally provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.

M1506.3. Delete entire section.

M1507.2. Delete and insert in lieu thereof the following: Recirculation of air. Exhaust air from bathrooms and toilet rooms shall not be recirculated within a residence or to another dwelling unit and shall be exhausted in accordance with Section M1501.1.

M1601.1.1. Delete and insert in lieu thereof the following: Above-ground duct systems. Above-ground duct systems shall conform to the following:
	1.	Equipment connected to duct systems shall be designed to limit discharge air temperature to not greater than 250° F. (121° C.).
	2.	Fibrous glass duct construction shall conform to the SMACNA Fibrous Glass Duct Construction Standards or NAIMA Fibrous Glass Duct Construction Standards.
	3.	Field-fabricated and shop-fabricated metal and flexible duct constructions shall conform to the SMACNA HVAC Duct Construction Standards - Metal and Flexible except as allowed by Table M1601.1.1. Galvanized steel shall conform to ASTM A 653.
	4.	The use of gypsum products to construct return air ducts or plenums is permitted, provided that the air temperature does not exceed 125° F. (52° C.) and exposed surfaces are not subject to condensation.
	5.	Duct systems shall be constructed of materials having a flame spread index of not greater than two hundred (200).
	6.	Stud wall cavities and the spaces between solid floor joists to be used as non-ducted air plenums shall comply with the following conditions:
	6.1.	These cavities or spaces shall not be used as a plenum for air supply.
	6.2.	These cavities or spaces shall not be a part of required fire-resistance-rated assembly.
	6.3.	Stud wall cavities and joist-space plenums shall be isolated from adjacent concealed spaces by tight-fitting fire blocking in accordance with Section R602.8.
	6.4.	Stud wall cavities in the outside walls of building envelope assemblies shall not be utilized as air plenums.

TABLE M1601.1.1. Delete and insert in lieu thereof the following:

Duct Construction Association Of St Louis & Eastern Missouri
Table M1601.1.1
Duct Construction Minimum Sheet Metal Thickness for Single Dwelling Units^a
		Static Pressure
		Thickness (inches)		Thickness (inches)
		Galvanized	Aluminum	Galvanized	Aluminum
Round Duct Diameter (inches)		1/2 inch water gage		1-inch water gage
<12		0.013	0.018	0.013	0.018
12 to 14		0.013	0.018	0.016	0.023
15 to 17		0.016	0.023	0.019	0.027
18		0.016	0.023	0.024	0.034
19 to 20		0.019	0.027	0.024	0.034
		Static Pressure
Rectangular Duct Dimension (largest dimension)		1/2 inch water gage		1-inch water gage
		Thickness (inches)		Thickness (inches)
		Galvanized	Aluminum	Galvanized	Aluminum
<8		0.013	0.018	0.013	0.018
9 to 10		0.013	0.018	0.016	0.023
11 to 12		0.016	0.023	0.019	0.027
13 to 16		0.016	0.027	0.019	0.027
17 to 18		0.019	0.027	0.024	0.034
19 to 20		0.019	0.034	0.024	0.034
For SI: 1 inch = 25.4 mm, 1-inch water gage = 249 Pa.
a.	Ductwork that exceeds twenty (20) inches by dimension or exceeds a pressure of 1-inch water gage (250 Pa) shall be constructed in accordance with SMACNA HVAC Duct Construction Standards Metal and Flexible.

M1601.4.1. Delete and insert in lieu thereof the following: Joints, seams and connections. Joints of duct systems shall be made substantially airtight in an unconditioned area by means of tapes, mastics, liquid sealants, gasketing or other approved closure systems. Closure systems used with rigid fibrous glass ducts shall comply with UL181A and shall be marked 181A-P for pressure-sensitive tape, 181A-M for mastic or 181A-H for heat-sensitive tape. Closure systems used with flexible air ducts and flexible air connectors shall comply with UL 181B and shall be marked 181B-FX for pressure-sensitive tape or 181B-M for mastic. Duct connections to flanges of air distribution system equipment or sheet metal fittings shall be mechanically fastened. Mechanical fasteners for use with flexible non-metallic air ducts shall comply with UL 181B and shall be marked 181B-C. Crimp joints for round metal ducts shall have a contact lap of at least one (1) inch and shall be mechanically fastened with at least three (3) sheet metal screws or rivets equally spaced around the joint. Closure systems used to seal metal ductwork shall be installed in accordance with the manufacturer's installation instructions.
	Exceptions:
	1.	Spray polyurethane foam shall be permitted to be applied without additional joint seals.
	2.	Where a duct connection is made that is partially inaccessible, three (3) screws or rivets shall be equally spaced on the exposed portion of the joint so as to prevent a hinge effect.
	3.	Continuously welded and locking-type longitudinal joints and seams in ducts operating at static pressure less than two (2) inches of water column (500 Pa) pressure classification shall not require additional closure systems.

M1602.2. Delete and insert in lieu thereof the following: Return air openings. Return air openings for heating, ventilation and air conditioning systems shall comply with all of the following:
	1.	Openings shall not be located less than ten (10) feet (3,048 mm) measured in any direction from an open combustion chamber or draft hood of another appliance located in the same room or space.
	2.	Return and transfer openings shall be sized in accordance with the appliance or equipment manufacturers' installation instructions, Manual D or the design of the registered design professional.
	3.	Return air shall not be taken from a bathroom, toilet room, kitchen, garage, mechanical room, boiler room, furnace room or unconditioned attic.
	Exceptions:
		1.	Taking return air from a kitchen is not prohibited where such return air openings serve the kitchen only, and are located not less than ten (10) feet (3,048 mm) from the cooking appliances.
		2.	Dedicated forced-air systems serving only the garage shall not be prohibited from obtaining return air from the garage.
		3.	Taking return air from an unconditioned crawl space shall not be accomplished through a direct connection to the return side of a forced-air furnace. Transfer openings in the crawl space enclosure shall not be prohibited.
		4.	Return air from one (1) dwelling unit shall not be discharged into another dwelling unit.

M2105.4. Delete and insert in lieu thereof the following: Piping and tubing materials standards. Ground-source heat-pump ground-loop pipe and tubing shall conform to the standards listed in Table M2105.4. However, polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) shall not be used on geothermal ground loops both inside and underground.

M2105.9. Delete entire section.

M2105.9.1. Delete entire section.

M2105.14. Delete entire section.

M2105.15.6. Delete entire section.

M2105.19. Delete and insert in lieu thereof the following: Pipe penetrations. Openings for pipe penetrations in walls, floors and ceilings shall be larger than the penetrating pipe. Openings in the foundation wall underground shall be sealed to not allow groundwater into a building.

M2105.28. Delete and insert in lieu thereof the following: Testing. The assembled loop system shall be pressure tested with water at forty-five (45) psi for fifteen (15) minutes without observed leaks. Flow and pressure loss testing shall be performed and the actual flow rates and pressure drops shall be compared to the calculated design values. If actual flow rate or pressure drop values differ from calculated design values by more than ten percent (10%), the cause shall be identified and corrective action taken.

G2408.4 (305.7). Delete and insert in lieu thereof the following: Clearances from grade. Equipment and appliances installed at grade level shall be supported on a level concrete slab or other approved material extending not less than two (2) inches (50.8 mm) above adjoining grade or shall be suspended not less than six (6) inches (152 mm) above adjoining grade. Such supports shall be installed in accordance with the manufacturer's installation instructions.

G2409.1(308.1). Delete and insert in lieu thereof the following: Scope. This Section shall govern the reduction in required clearances to combustible materials, and combustible assemblies for chimneys, vents, appliances, devices and equipment. Clearance requirements for air-conditioning equipment and central heating boilers and furnaces shall comply with Sections G2409.3 and G2409.4.

G2412.9 (401.9). Delete entire section.

G2412.10 (401.10). Delete entire section.

G2415.3 (404.3). Delete and insert in lieu thereof the following: Prohibited locations. Piping shall not be installed in or through a ducted supply, return or exhaust, or a clothes chute, chimney or gas vent, dumbwaiter or elevator shaft.

G2439.7.4.1 (614.8.4.1). Delete and insert in lieu thereof the following: Specified length. The maximum length of the exhaust duct shall be thirty-five (35) feet (10 688 mm) from the connection to the transition duct from the dryer to the outlet terminal. Where fittings are used, the maximum length of the exhaust duct shall be reduced in accordance with Table G2439.7.4.1. The maximum length of the exhaust duct does not include the transition duct.

Exception: The maximum developed length may be extended to fifty-five (55) feet of rigid pipe if clearly labeled cleanouts are provided within twelve (12) inches of the second elbow, at every elbow thereafter, and at least every fifteen (15) feet of developed length thereafter.

G2442.4 (618.4). Delete and insert in lieu thereof the following: Prohibited sources. Outdoor or return air for forced-air heating and cooling systems shall not be taken from the following locations:
	1.	Closer than ten (10) feet (3,048 mm) from an appliance vent outlet, a vent opening from a plumbing drainage system or the discharge outlet of an exhaust fan, unless the outlet is three (3) feet (914 mm) above the outside air inlet.
	2.	Where there is the presence of objectionable odors, fumes or flammable vapors; or where located less than ten (10) feet (3,048 mm) above the surface of any abutting public way or driveway; or where located at grade level by a sidewalk, street, alley or driveway.
	3.	A hazardous or insanitary location or a refrigeration machinery room as identified in the International Mechanical Code.
	4.	A room or space, the volume of which is less than twenty-five percent (25%) of the entire volume served by such system. Where connected by a permanent opening having an area sized in accordance with Section G2442.2, adjoining rooms or spaces shall be considered as a single room or space for the purpose of determining the volume of such rooms or spaces.
	Exception: The minimum volume requirement shall not apply where the amount of return air taken from a room or space is less than or equal to the amount of supply air delivered to such room or space.
	5.	A room or space containing an appliance where such a room or space serves as the sole source of return air.
	Exception: This shall not apply where:
		1.	The appliance is a direct-vent appliance or an appliance not requiring a vent in accordance with Section G2425.8.
		2.	The room or space complies with the following requirements:
		2.1.	The return air shall be taken from a room or space having a volume exceeding 1 cubic foot for each 10 Btu/h (9.6L/W) of combined input rating of all fuel-burning appliances therein.
		2.2.	The volume of supply air discharged back into the same space shall be approximately equal to the volume of return air taken from the space.
		2.3.	Return-air inlets shall not be located within ten (10) feet (3,048 mm) of a draft hood in the same room or space or the combustion chamber of any atmospheric burner appliance in the same room or space.
		3.	Rooms or spaces containing solid fuel-burning appliances, provided that return-air inlets are located not less than ten (10) feet (3,048 mm) from the firebox of such appliances.
	6.	A closet, bathroom, toilet room, kitchen, garage, boiler room, furnace room or unconditioned attic.
	Exceptions:
		1.	Where return air intakes are located not less than ten (10) feet (3,048 mm) from cooking appliances and serve only the kitchen area, taking return air from a kitchen area shall not be prohibited.
		2.	Dedicated forced air systems serving only a garage shall not be prohibited from obtaining return air from the garage.
		3.	Where a closet is provided with a supply register, taking return air from the closet shall not be prohibited.
	7.	A crawl space by means of direct connection to the return side of a forced-air system. Transfer openings in the crawl space enclosure shall not be prohibited.

P2503.5.1. Delete and insert in lieu thereof the following: Rough plumbing. DWV systems shall be tested on completion of the rough piping installation by water or by air without evidence of leakage. Either test shall be applied to the drainage system in its entirety or in sections after rough-in piping has been installed, as follows:
	1.	Water test. Each section shall be filled with water to a point not less than five (5) feet (1,524 mm) above the highest fitting connection in that section, or to the highest point in the completed system. Water shall be held in the section under test for a period of fifteen (15) minutes. The system shall prove leak free by visual inspection.
	2.	Air test. The portion under test shall be maintained at a gauge pressure of five (5) pounds per square inch (psi) (34kPa) or ten (10) inches of mercury column (34 kPa). This pressure shall be held without introduction of additional air for a period of fifteen (15) minutes.

P2503.6. Delete entire section.

P2603.4. Delete and insert in lieu thereof the following: Pipes through foundation walls. A pipe that passes through a foundation wall shall be provided with a relieving arch, or a pipe sleeve shall be built into the foundation wall.

P2603.5.1. Delete and insert in lieu thereof the following: Sewer depth. Building sewers that connect to private sewage disposal systems shall be not less than eighteen (18) inches below finished grade at the point of septic tank connection. Building sewers shall be not less than eighteen (18) inches below grade.

P2609.1. Delete entire section.

P2609.2. Delete entire section.

P2609.3. Delete entire section.

P2609.4. Delete entire section.

P2706.3. Delete and insert in lieu thereof the following: Prohibited waste receptors. Plumbing fixtures that are used for washing or bathing shall not be used to receive the discharge of indirect waste piping.
	Exceptions:
	1.	A kitchen sink trap is acceptable for use as a receptor for a dishwasher.
	2.	A laundry tray is acceptable for use as a receptor for a clothes washing machine.
	3.	A drain or waste pipe above a trap is acceptable for use as a receptor for mechanical equipment condensate drains.

P2801.8. Delete and insert in lieu thereof the following: Water heater seismic bracing. In Seismic Design Categories D0, D1 and D2, water heaters shall be anchored or strapped in the upper one-third (1/3) and in the lower one-third (1/3) of the appliance to resist a horizontal force equal to one-third (1/3) of the operating weight of the water heater, acting in any horizontal direction, or in accordance with the appliance manufacturer's recommendations.

P2903.4.3. Insert the following: P2903.4.3. Expansion Tanks. Any system with a new or a replacement water heating apparatus shall be provided with an approved, listed and adequately sized thermal expansion device (expansion tank), installed within ten (10) feet of and on the cold water supply to the water heater. The tank may be installed in a vertical up, vertical down, or horizontal position in accordance with the manufacturer's recommendation.
Exception:
1)	Listed non-storage instantaneous heaters having an inside diameter of not more than three (3) inches. Water heaters, thirty (30) gallons or less, installed under counter or in confined spaces in multi-family units, may use adequately sized mechanical water hammer arrestors to provide for thermal expansion with the approval of the authority having jurisdiction or his/her representative.
2)	One- and two-family residences served by private well.

P2903.5. Delete and insert in lieu thereof the following: Water hammer. The flow velocity of the water distribution system shall be controlled to reduce the possibility of water hammer. A water-hammer arrestor shall be installed where quick-closing valves are used. Water-hammer arrestors shall be installed in accordance with the manufacturer's installation instructions. Water-hammer arrestors shall conform to ASSE 1010.

P2904.1. Delete and insert in lieu thereof the following: General. When installed, the design and installation of residential fire sprinkler systems shall be in accordance with NFPA 13D or Section 2904, which shall be considered equivalent to NFPA 13D. Partial residential sprinkler systems shall be permitted to be installed only in buildings not required to be equipped with a residential sprinkler system. Section P2904 shall apply to stand-alone and multipurpose wet-pipe sprinkler systems that do not include the use of antifreeze. A multipurpose fire sprinkler system shall provide domestic water to both fire sprinklers and plumbing fixtures. A stand-alone sprinkler system shall be separate and independent from the water distribution system. A backflow preventer shall not be required to separate a stand-alone system from the water distribution system.

P3003.9.2. Delete the following word: Purple.

P3005.2. Insert the following: Cleanout must be a minimum of thirty six (36) inches off the finished floor.

P3102.3. Insert the following: Stack required. Every building in which plumbing is installed shall have at least one (1) stack the size of which is not less than seventy-five percent (75%) of the required size of the building drain. Such stack shall run undiminished in size.

P3103.2. Delete and insert in lieu thereof the following: Frost closure. Where the 97.5-percent value for outside design temperature is 0° F. (-18° C.) or less, vent extensions through the roof or wall shall be not less than two (2) inches in diameter. Any increase in the size of the vent shall be made not less than one (1) foot (304.8 mm) inside the thermal envelope of the building.

P3201.2.1. Delete and insert in lieu thereof the following: Trap seal protection. Traps seals of emergency floor drain traps and traps subject to evaporation shall be protected by one (1) of the methods in Sections P3201.2.1.1 through P3201.2.1.4.
	Exception: Basement floor drains with a condensate line draining to it.

Chapters 34 — 43. Delete entire chapters.

Adopt Appendix G: Swimming Pools, Spas, and Hot Tubs.

Appendix E. Delete and insert in lieu thereof the following:

LOCAL MANUFACTURED HOUSING STANDARDS

Section AE101. New Installation: Placement of manufactured housing is subject to the Unified Development Order.

Section AE102. New Manufactured Housing Sites. On all new manufactured housing sites, the area of the unit plus eight (8) foot surrounding the unit must be graded level, or fill may be used to level the site. All supports must go through fill into original soil, or fill may be compacted per the 2015 International Building Code requirements, Section 1802. A compaction report would be required from a soil engineer.

Section AE103. Manufactured units installed on foundations. Foundations are required to be poured concrete or concrete blocks with mortar designed to bear the weight of the unit. Footings are required to be installed with a dimension of eight (8) inches by sixteen (16) inches. The foundation walls shall extend a minimum of thirty (30) inches below the surface and eighteen (18) inches above the surface.

Section AE104. Manufactured units may be installed on a pad when approved in certain zone districts.

Section AE104.1. Types of supports.

Pad: The pad for all mobile homes, including double-wide mobile homes, must be a minimum width to cover the entire area underneath the mobile home including the skirting. The pad shall be a minimum six (6) inches thick concrete, reinforced with concrete wire mesh, minimum ten (10) gauge, six (6) by six (6) inch grid; or one-half (1/2) inch rebar twenty-four (24) inches on center both ways no more than one (1) foot in eighty-foot slope.

Section AE104.2. Other requirements for securing manufactured units not on foundations. Tie down requirement — All manufactured homes shall be tied down in accordance with the manufacturer's specifications. The applicant shall submit the tie down requirements, as specified by the manufacturer, with the application for the building permit. A system designed to withstand a ninety (90) mile per hour wind velocity shall be a minimum approved system. Ground anchors must be used when installing mobile units on pier footings or runners. Each anchor shall have a registered holding strength of four thousand eight hundred (4,800) pounds. Where the manufacturer does not provide specifications or the specifications are less stringent, the following standards shall apply:

Mobile Home Size	No. of Diagonal Ties Per Side	No of Vertical Ties Per Side
10' — 12' Wide by 30' — 50' Long	3	2
10' — 12' Wide by 50' — 60' Long	4	2
12' — 16' Wide by 60' — 80' Long	4	2
* Note: Where a unit is not designed for vertical ties, six (6) diagonal ties per side are required*

Section AE105. Type, Location, and Maximum Height of Blocking at Support Points. A minimum of eight (8) inches by eight (8) inches by sixteen (16) inches concrete block shall be used with the open cells placed vertically; all blocks capped with solid oak or yellow pine wood, a minimum of one and one-half (1 1/2) inches thick, or two (2) inch by sixteen (16) inch solid concrete block. A maximum of two (2) cappings per stack of blocks can be used. All blocks must be located on the supports so there is a minimum of one (1) foot of concrete exposed beyond the outer side or end of the block. All blocks must be set so the length of the block is perpendicular to the length of the beams. Maximum height of all blocking shall be five (5) blocks.

Section AE106. Stairs, Landings, or Decks for Manufactured Homes. At each door, there must be a set of stairs, landing or deck constructed in compliance with the 2015 International Residential Code, Section R312 and the 2015 Jefferson County Local Amendments to the 2015 International Residential Code. All stairs and landings must be set on a level, stabilized base consisting of either a minimum three (3) inch by three (3) foot by four (4) inch deep concrete pad; or a set of four (4) four by four treated posts, two (2) feet deep into the ground, lag bolted to two (2) two by six treated boards across the post at grade level. All stairs and landings must be permanently bolted to either the home or the stabilized base. If a landing is constructed, it must be a minimum of three (3) feet square. All decks, guardrails and handrails must be constructed in compliance with this code. The base of all stairs and/or edge of landings or decks cannot extend over the required setback lines. All doors shall have decks or landings.

Section AE107. Unoccupied Manufactured Home Site or Manufactured Home Park. A manufactured home shall not be reinstalled or altered without first obtaining a permit from the Jefferson County Code Enforcement Division. Said installation must meet all current code requirements. In a manufactured home park, it shall be the duty of the park owner to apply for the building permit for each manufactured housing unit site. The installation shall meet all code requirements. Distance from road easements, lot lines, and distance between units may be waived whenever it is shown to the Building Official's satisfaction that the proposed installation sought in the permit will not encroach any further than that which previously existed.

Section AE108. Requirements for Plats or Diagram of Manufactured Home Parks. All owners of manufactured home parks shall submit a plat of their existing park within ninety (90) days showing the metes and bounds thereof and the location of each existing trailer or manufactured home thereupon, including the size of the units, proximity of such unit to other units in said court, proximity of such units to all roadways and rights-of-way both within and outside of said trailer court, and other landmarks or buildings located within said park or in the vicinity thereof. Such diagram or plat shall not be required to be drafted by a professional draftsman, but shall be done in an accurate manner utilizing accepted drafting and actual measurements on the premises of the distances set forth in said plat and providing an appropriate approved scale of measure in said plat.

Section AE109. Plans and Specifications. Plans drawn to scale and all specifications must be submitted and approved before construction can begin.

Section AE110. Gutters and Leaders. Modular and manufactured homes installed on foundations shall be provided with gutters and downspouts or leaders to dispose of roof drainage. These must be installed before final inspection.

RECREATIONAL VEHICLES

In compliance with the Flood Plain Damage Prevention Ordinance, adopted by Jefferson County, Missouri, Council.

Section AE111. Definition: Building Service Equipment. Refers to the plumbing, mechanical and electrical equipment including piping, wiring, fixtures and other accessories which provide sanitation, lighting, heating ventilation, cooling, fire protection and facilities essential for the habitable occupancy of a manufactured home or accessory building or structure for its designated use and occupancy.

Section AE112. Maintenance. All manufactured homes and the building service equipment, existing and new, and all parts thereof shall be maintained in a safe and sanitary condition. All devices or safeguards which are required by applicable codes or by the Manufactured Home Standards shall be maintained in conformance with the code or standard under which it was installed. The owner or the owner's designated agent shall be responsible for the maintenance of manufactured homes, accessory buildings, structures and their building service equipment. To determine compliance with this Subsection, the Code Official may cause any manufactured home, accessory building or structure to be reinspected.

Section AE113. Building Service Equipment. The installation, alteration, repair, replacement, addition to or maintenance of the building service equipment shall conform with the applicable codes set forth by Jefferson County.

Section AE114. Building Service Equipment Inspections. All building service equipment which is required as a part of a manufactured home installation, including accessory buildings and structures authorized by the same permit, shall be inspected by the Code Official. Building service equipment shall be inspected and tested as required by the applicable codes. Such inspections and testing shall be limited to site construction and shall not include building service equipment which is part of the manufactured home itself. No portion of any building service equipment intended to be concealed by any permanent portion of the construction shall be concealed until inspected and approved. Building service equipment shall not be connected to the water, fuel or power supply or sewer system until authorized by the Code Official.

Section RV101. General

Subsection RV101.1. Purpose. The provisions of the Recreational Vehicle Section shall be an addition to the local amendments of the 2015 International Residential Code for Jefferson County, Missouri to provide regulations and permitting requirements for the purpose of installing and occupying recreational vehicles.

Subsection RV101.2. Definition. A recreational vehicle as defined and derived from the Flood Plain Damage Prevention Ordinance means a vehicle which is: (a) built on a single chassis; (b) four hundred (400) square feet or less when measured at the largest horizontal projections; (c) designed to be self-propelled or permanently towable by a light-duty truck; and (d) designed primarily not for use as a permanent dwelling, but as temporary living quarters for recreational, camping, travel, or seasonal use.

Subsection RV101.3. Unless otherwise provided for in the Code of Ordinances of Jefferson County, Missouri, Recreational Vehicles may not be utilized as a residence.

Section RV102. Permit Application. A permit application must be made for the purpose of installing a recreational vehicle in an authorized recreational vehicle (RV) park. The permit will be valid for a period of one (1) year from the date of permit issuance.

Section RV103. Renewal of permit. The Code Official is authorized to issue an extension and renewal of the permit application for a period not to exceed sixty (60) days. The request for the extension and renewal of permit application must be made in writing and demonstrate justifiable cause to extend such permit. The date and time limits as set forth in this Code and as determined acceptable by the Code Official shall be monitored by the recreational vehicle park owner, with copies of such submitted to the Code Official at the end of each period.

Section RV104. Fee. Fees as related to recreational vehicles are hereby referenced in Section 500.250, Fee Schedule.

[1]

Editor's Note: By implication of the changes herein, the reference to the date for the code adopted herein in the title of this Article was changed from "2009" to "2015."

[2]

Editor's Note: Table 404.1.2(8) is included as an attachment to this Chapter.