St. Charles County, MO Article III Residential Code For One- And Two-Family Dwellings [1]

[1] Editor’s Note: Former Article III, Electrical Code, containing Sections 500.030 through 500.040, was repealed 7-5-2017 by § 3 of Ord. No. 17-061. See now Section 500.260.

Section 500.150 Adoption Of Residential Code For One- And Two-Family Dwellings Of St. Charles County.

[Ord. No. 17-061 § 3, 7-5-2017; Ord. No. 19-035, 5-13-2019; Ord. No. 22-034, 6-13-2022; Ord. No. 23-102, 11-13-2023]

St. Charles County hereby adopts the 2021 St. Charles County Residential Code for One- and Two-Family Dwellings, a copy of which shall be deposited in the Office of the County Registrar with this ordinance, including Appendices AE, AG, AI, AJ, AK, AM, AP and AQ, with the following amendments by additions, insertions, deletions and changes to read as follows:

(CHAPTER 1 SCOPE AND ADMINISTRATION)
(SECTION R101 SCOPE AND GENERAL REQUIREMENTS)
R101.1 Title. These regulations shall be known as the Residential Code for One- and Two-Family Dwellings of St. Charles County, Missouri, and shall be cited as such and will be referred to herein as “this code.”
R101.2 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal and demolition of detached one- and two-family dwellings and townhouses not more than three (3) stories above grade plane in height with a separate means of egress and their accessory structures not more than three (3) stories above grade plane in height.
Exceptions: The following shall be permitted to be constructed in accordance with this code:
1.	Live/work units located in townhouses and complying with the requirements of Section 508.5 of the Building Code of St. Charles County, codified in Section 500.100 OSCCMo., when provided with an automatic sprinkler system complying with Section P2904.
2.	Owner-occupied lodging houses with five (5) or fewer guestrooms.
3.	A care facility with eight (8) or fewer persons receiving custodial care within a dwelling unit.
4.	A care facility with eight (8) or fewer persons receiving medical care within a dwelling unit.
5.	A care facility with eight (8) or fewer persons receiving care that are within a single-family dwelling.
(SECTION R103 CODE COMPLIANCE AGENCY)
R103.1 Creation of enforcement agency. The Division of Building and Code Enforcement within the Department of Community Development is hereby created and the official in charge thereof shall be known as the Building Official. The function of the agency shall be the implementation, administration and enforcement of the provisions of this code.
R103.2 Appointment. The Building Official shall be appointed as provided by ordinance.
(SECTION R105 PERMITS)
R105.2 Work exempt from permits. Exemptions 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 this jurisdiction. Permits shall not be required for the following:
Building:
1.	Other than storm shelters, one-story detached accessory structures, provided that the floor area does not exceed one hundred twenty (120) square feet (11.15 m2) or two hundred (200) square feet (18.58 m2) for portable structures.
2.	Fences not over seven (7) feet (2,134 mm) high.
3.	Retaining walls that are not over four (4) feet (1,219 mm) in height measured from the bottom of the footing to the top of the wall, unless supporting a surcharge.
4.	Water tanks supported directly on grade if the capacity is not greater than five thousand (5,000) gallons (18,925 L) and the ratio of height to diameter or width does not exceed 2:1.
5.	Sidewalks and driveways.
6.	Painting, papering, tiling, carpeting, cabinets, counter tops 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 one hundred twenty (120) square feet (11.15 m2) in area, that are not more than thirty (30) inches (762 mm) above grade at any point, are not attached to a dwelling, and do not serve the exit door required by Section R311.4.
11.	Flag poles less than forty (40) feet in height.
12.	Replacement of three (3) or less doors and/or windows where the opening size is not increased or decreased.
Electrical:
1.	Listed cord-and-plug connected temporary decorative lighting.
2.	Reinstallation of attachment plug receptacles but not the outlets therefor.
3.	Replacement of branch circuit overcurrent devices of the required capacity in the same location.
4.	Electrical wiring, devices, appliances, apparatus or equipment operating at less than twenty-five (25) volts and not capable of supplying more than fifty (50) watts of energy.
5.	Minor repair work, including the replacement of lamps or the connection of approved portable electrical equipment to approved permanently installed receptacles.
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; provided, however, that if any concealed trap, drainpipe, water, soil, waste or vent pipe becomes defective and it becomes necessary to remove and replace the same with new material, such work shall be considered as new work, and a permit shall be obtained and inspection made as provided in this code.
2.	The clearing of stoppages or the repairing of leaks in pipes, valves, or fixtures, and the removal and reinstallation of water closets, provided such repairs do not involve or require the replacement or rearrangement of valves, pipes, or fixtures.
3.	Fixture replacement with similar fixtures where plumbing connections are not relocated, and new fittings and valves are not installed.
R105.5.1 Reinstatement. A permit that has expired may be reinstated where approved by the Building Official. The request for reinstatement shall be in writing and justifiable cause demonstrated.
(SECTION R106 CONSTRUCTION DOCUMENTS)
R106.1 Submittal documents. Submittal documents consisting of construction documents, and other data shall be submitted as required by the Building Official, with each permit application. The construction documents shall be prepared by a registered design professional where required by the statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the Building Official is authorized to require additional construction documents to be prepared by a registered design professional.
Exception: The Building Official is authorized to waive the submission of construction documents and other data not required to be prepared by a registered design professional if it is found that the nature of the work applied for is such that review of construction documents is not necessary to obtain compliance with this code.
R106.1.6 Electronic submission. Where design documents, including, but not limited to, plot plans, site plans, design drawings, specifications, etc., are originally created electronically, the Building Official is authorized to require electronic submittal of documents in a portable document format (PDF) or similar format for review. Where design documents were originally prepared on paper and are submitted in a paper form, the Code Official is authorized to charge a fee for converting those drawings to PDF equal to the cost incurred by County staff recreating the document and not to exceed more than one dollar ($1.00) per page.
Exception:
Where submittal documents were originally prepared by hand and are eleven (11) inches by seventeen (17) inches or less, the fee for document conversion shall not be charged.
R106.3.1 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 shall be returned to the applicant, may be kept at the site of work or made available at time of inspection, and shall be open to inspection by the Building Official or a duly authorized representative.
(SECTION R108 FEES)
R108.6 Work commencing before permit issuance. Any person who commences work requiring a permit on a building, structure, electrical, gas, mechanical or plumbing system before obtaining the necessary permits shall be subject to a fee established by the applicable governing authority that shall be in addition to the required permit fees.
Exceptions:
1.	Rough grading less than five thousand (5,000) square feet, not to include excavating for basements.
2.	Stakeouts and other similar preparatory actions.
(SECTION R112 MEANS OF APPEALS)
R112.1 General. For the purposes of this code, all appeals shall be in accordance with the procedure established for the Building Code of St. Charles County, Missouri, in Section 113 of Section 500.100.
R112.2 Limitations on authority. Delete in its entirety.
R112.3 Qualifications. Delete in its entirety.
R112.4 Administration. Delete in its entirety.
(SECTION R113 VIOLATIONS)
R113.4 Violation penalties. Any person who violates a provision of this code or fails to comply with any of the requirements thereof or who repairs or alters or changes the occupancy of a building or structure in violation of the approved construction documents or directive of the Building Official, or of a permit or certificate issued under the provisions of this code, shall be guilty of a misdemeanor and upon conviction thereof shall be punishable by a fine of not more than five hundred dollars ($500.00), and each day's continuance of a violation shall be deemed a separate offense
(SECTION R114 STOP WORK ORDER)
R114.2 Issuance. The stop work order shall be in writing and shall be given to the owner of the property involved, the owner’s authorized agent or the person performing the work. Upon issuance of a stop work order, the cited work shall immediately cease. The stop work order shall state the reason for the order and the conditions under which the cited work will be authorized to resume. Any person served with a stop work order shall pay an administrative penalty of up to two hundred fifty dollars ($250.00).

(CHAPTER 3 BUILDING PLANNING)

(SECTION R301 DESIGN CRITERIA)

Table R301.2 shall have the required information inserted to read as follows:

(TABLE R301.2) Climatic And Geographic Design Criteria
Ground Snow Loado	Wind Design				Seismic Design Categoryf	Subject to Damage From			Ice Barrier Under-Layment Requiredh	Flood Hazardsg	Air Freezing Indexi	Mean Annual Tempj
	Speedd (mph)	Topog raphic Effectsk	Special Wind Region1	Wind-Borne Debris Zonem		Weatheringa	Frost Line Depthb	Termitec
20	107(48)	No	No	No	C	Severe	30	Moderate to Heavy	No	9-15-1978 3-9-2021	1,000	55

(TABLE R301.2) Manual J Design Criterian
Elevation	Altitude correction factore	Coincident wet bulb	Indoor winter design dry-bulb temperature	Indoor winter design dry-bulb temperature	Outdoor winter design dry-bulb temperature	Heating temperature difference
—	—	—	—	—	—	—
Latitude	Daily range	Indoor summer design relative humidity	Indoor summer design relative humidity	Indoor summer design dry-bulb temperature	Outdoor summer design dry-bulb temperature	Cooling temperature difference
—	—	—	—	—	—	—

For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s.
a.	Where weathering requires a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code, the frost line depth strength required for weathering shall govern. The weathering column shall be filled in with the weathering index, "negligible," "moderate" or "severe" for concrete as determined from Figure R301.2(1). The grade of masonry units shall be determined from ASTM C34, ASTM C55, ASTM C62, ASTM C73, ASTM C90, ASTM C129, ASTM C145, ASTM C216 or ASTM C652.
b.	Where the frost line depth requires deeper footings than indicated in Figure R403.1(1), the frost line depth strength required for weathering shall govern. 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(2)]. Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4.
e.	The jurisdiction shall fill in this part of the table to establish the design criteria using table 10A from ACCA Manual J or established criteria determined by the jurisdiction.
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: 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); and the title and date of the currently effective Flood Insurance Study or other flood hazard study.
h.	In accordance with Sections R905.1.2, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, where there has been a history of local damage from the effects of ice damming, the jurisdiction shall fill in this part of the table with "YES." Otherwise, the jurisdiction shall fill in this part of the table with "NO."
i.	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.)."
j.	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.)."
k.	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.
l.	In accordance with Figure R301.2(2), 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.
m.	In accordance with Section R301.2.1.2, the jurisdiction shall indicate the wind-borne debris wind zone(s). Otherwise the jurisdiction shall indicate "NO" in this part of the table.
n.	The jurisdiction shall fill in these sections of the table to establish the design criteria using Table 1a or 1b from ACCA Manual J or established criteria determined by the jurisdiction.
o.	The jurisdiction shall fill in this Section of the table using the Ground Snow Loads in Figure R301.2(3) and R301.2(4).

(SECTION R302 FIRE-RESISTANT CONSTRUCTION)
R302.5.1 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-eighths (1 3/8) inches (35 mm) in thickness, solid or honeycomb-core steel doors not less than one and three-eighths (1 3/8) inches (35 mm) thick, or 20-minute fire-rated doors.
R302.13 Fire protection of floors. Floor assemblies that are not required elsewhere in this code to be fire-resistance rated, shall be provided with a 1/2-inch (12.7 mm) gypsum wallboard membrane, 5/8-inch (16 mm) wood structural panel membrane, or equivalent on the underside of the floor framing member. Penetrations or openings for ducts, vents, electrical outlets, lighting, devices, luminaires, wires, speakers, drainage, piping and similar openings or penetrations shall be permitted. Fire blocking, draft stopping, fire taping, and/or additional framing is not required.
Exceptions:
1.	Floor assemblies located directly over a space protected by an automatic sprinkler system in accordance with Section P2904, NFPA 13D, or other approved equivalent sprinkler system.
2.	Floor assemblies located directly over a crawl space not intended for storage or for the installation of fuel-fired or electric-powered heating appliances.
3.	Portions of floor assemblies shall be permitted to be unprotected where complying with the following:
	a.	The aggregate area of the unprotected floor assembly does not exceed 100 square feet per HVAC zone.
	b.	Areas of the floor assembly covered by HVAC metal plenum, trunk lines, and steel structural beams shall be considered protected. Gypsum wallboard membrane shall be within two (2) inches of all previously listed items.
4.	Wood floor assemblies using dimension lumber or structural composite lumber equal to or greater than 2-inch by 10-inch (50.8 mm by 254 mm) nominal dimension, or other approved floor assemblies demonstrating equivalent fire performance.

(SECTION R303 LIGHT, VENTILATION AND HEATING)

R303.1.2 Unfinished basements. Unfinished basements shall have an aggregate glazing area of not less than one percent (1%) of the floor area and shall be openable to the outdoors.

R303.5.2 Exhaust openings. Exhaust air shall not be directed below six (6) feet and eight (8) inches onto public walkways.

R303.8 Exterior stairway illumination. Exterior stairways shall be provided with an artificial light. 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.

(SECTION R311 MEANS OF EGRESS)
R311.3 Floors and landings at exterior doors. There shall be a landing or floor on each side of each exterior door. The width of each landing shall not be less than the door served. Every landing shall have a dimension of not less than thirty-six (36) inches (914 mm) measured in the direction of travel. The slope at exterior landings shall not to exceed one-fourth (1/4) unit vertical in twelve (12) units horizontal (2%).
Exceptions:
1.	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.
2.	Doors that are not required egress doors and are served by a stairway with no more than 3 risers.
3.	Doors protected by a guard in accordance with this code.
4.	Doors protected in a manner approved by the Building Official.
R311.3.2 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 not more than three (3) risers is located on the exterior side of the door, provided that the door does not swing over the stairway.

(SECTION R313 AUTOMATIC FIRE SPRINKLER SYSTEMS)

R313.1 Townhouse automatic fire sprinkler systems. Any builder of a townhouse shall offer to any purchaser the option to install or equip such townhouse with an automatic sprinkler system at the purchaser's cost in accordance with the latest version of Section 67.281, RSMo.

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.

R313.2 One- and two-family dwellings automatic fire systems. Any builder of a one- or two-family dwellings shall offer to any purchaser the option to install or equip such one- or two-family dwellings with an automatic sprinkler system at the purchaser's cost in accordance with the latest version of Section 67.281, RSMo.

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.

(SECTION R314 SMOKE ALARMS)
R314.2.2 Alterations, repairs and additions. Where alterations, repairs or additions requiring a permit occur, the individual dwelling unit shall be equipped with smoke alarms located as required for new dwellings.
Exceptions:
1.	Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, or the addition of a porch or deck.
2.	Installation, alteration or repairs of plumbing or mechanical systems.
R314.4 Interconnection. Where more than one (1) smoke alarm is required to be installed within an individual dwelling unit in accordance with Section R314.3, the alarm devices shall be interconnected in such a manner that the actuation of one (1) alarm will activate all of the alarms in the individual dwelling unit. Physical interconnection of smoke alarms shall not be required where listed wireless alarms are installed and all alarms sound upon activation of one (1) alarm.
Exception: Interconnection is not required in buildings which are only receiving the addition or replacement of windows or doors.

(SECTION R315 CARBON MONOXIDE ALARMS)
R315.2.2 Alterations, repairs and additions. Where alterations, repairs or additions requiring a permit occur, the individual dwelling unit shall be equipped with carbon monoxide alarms located as required for new dwellings.
Exceptions:
1.	Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, or the addition of a porch or deck.
2.	Installation, alteration or repairs of plumbing systems.
3.	Installation, alteration or repairs of mechanical systems that are not fuel fired.

(CHAPTER 4 FOUNDATIONS)

(SECTION R404 FOUNDATION AND RETAINING WALLS)

R404.1.3.2 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(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 building 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, as indicated by a provided soils report or letter sealed by a registered engineer licensed in the State of Missouri, concrete foundation walls may be constructed in accordance with Table R404.1.2(10).

Table R404.1.2(10) Concrete Foundation Walls
Maximum Wall Height	Maximum Depth of Unbalanced Backfill	Minimum Nominal Wall Thickness
8'-0"	7'-^" or less	8" (Note a)
9'-0"	8'-6" or less	10" (Note b)
10'-0"	9'-6" or less	12" (Note c)

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 (2) #4 reinforcing bars shall be placed horizontally in the top and bottom of the foundation wall. A minimum of two (2) #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 (2) #5 reinforcing bars shall be placed horizontally in the top, middle, and bottom of the foundation wall. A minimum of two (2) #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 c: Concrete foundation walls may be constructed a minimum of nominal twelve (12) inches thick. A minimum of three (3) #5 reinforcing bars shall be placed horizontally in the top, middle, and bottom of the foundation wall. A minimum of two (2) #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 d: The concrete minimum wall thickness shall be eight (8) inches for foundation walls in soil classes SC, MH, ML-CL and inorganic CL when maximum wall height is eight (8) feet.

Note e: 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.

Note f: 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.

(SECTION R405 FOUNDATION DRAINAGE)
R405.1 Concrete or masonry foundations. Drains shall be provided around concrete or masonry foundations that retain earth and enclose habitable or usable spaces located below grade. Drainage tiles, gravel or crushed stone drains, perforated pipe or other approved systems or materials shall be installed at or below the area to be protected and shall discharge by gravity or mechanical means into an approved drainage system. Gravel or crushed stone drains shall extend not less than one (1) foot (305 mm) beyond the outside edge of the footing and six (6) inches (152 mm) above the top of the footing and be covered with an approved filter membrane material. The top of open joints of drain tiles shall be protected with strips of building paper. Except where otherwise recommended by the drain manufacturer, perforated drains shall be surrounded with an approved filter membrane or the filter membrane shall cover the washed gravel or crushed rock covering the drain. Drainage tiles or perforated pipe shall be placed on a minimum of two (2) inches (51 mm) of washed gravel or crushed rock not less than one (1) sieve size larger than the tile joint opening or perforation and covered with not less than six (6) inches (152 mm) of the same material.
Exceptions:
1.	A drainage system is not required where the foundation is installed on well-drained ground or sand-gravel mixture soils according to the Unified Soil Classification System, Group I soils, as detailed in Table R405.1.
2.	Drains provided as detailed in Section R405.1.2 are approved as an alternative method to meet the requirements of this Section.
R405.1.2 Soil evaluations. 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.
R405.1.2.1 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 and inside the foundation. Drain discharge shall be by gravity to daylight or be connected to a basement floor sump.
R405.1.2.2 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.
R405.1.2.3 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 6-inch minimum cover.
R405.1.2.4 Drainage system. Drainage system shall discharge by gravity to daylight or be connected to an approved sump [eighteen (18) inches in diameter x twenty-four (24) inches deep with fitted cover] with pump. A sump pump shall be provided if the basement is finished or partially finished with pump discharge by an approved method

(CHAPTER 5 FLOORS)

(SECTION R506 CONCRETE FLOORS (ON GROUND))

R506.2.3 Vapor Retarder. A minimum six (6) mil (0.006 inch; 0.152 mm) vapor retarder conforming to ASTM E1745 Class A requirements with joints lapped not less than six (6) inches (152 mm) shall be placed between the concrete floor slab and the base course or the prepared subgrade where a base course does not exist.

(CHAPTER 9 ROOF ASSEMBLIES)
(SECTION R905 REQUIREMENTS FOR ROOF COVERINGS)
R905.2.8.2 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 (2) plies of mineral-surfaced roll roofing, complying with ASTM D3909 or ASTM D6380 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 one (1) ply of smooth roll complying with ASTM D 6380 and not less than thirty-six (36) inches wide (914 mm) or valley lining as described in Item 1 and 2 shall be permitted. Self-adhering polymer modified bitumen underlayment complying with ASTM D1970 shall be permitted in lieu of the lining material.
4.	For closed valleys and where not specified by the manufacturer, valley lining of two (2) ply of No. 15 felt complying with ASTM D226 Type I, ASTM D4869 Type I, or ASTM D6757, or valley lining as described in Item 3 shall be permitted.
R905.2.8.5 Drip Edge. A drip edge shall be provided at eaves and rake edges of shingle roofs. Adjacent segments of drip edge shall be overlapped not less than two (2) inches (51 mm). Drip edges shall extend not less than one-fourth (1/4) inch (6.4 mm) below the roof sheathing and extend up back onto the roof deck not less than two (2) inches (51 mm). Drip edges shall be mechanically fastened to the roof deck at not more than twelve (12) inches (305 mm) o.c. with fasteners as specified in Section R905.2.5. Underlayment shall be installed over the drip edge along eaves and under the drip edge along rake edges.
Exception: Unless the drip edge is specifically required by the manufacturer's installation instructions, metal wrapped fascia extending one (1) inch under the roof covering with the underlayment installed over it shall be deemed to meet the requirements of this Section.

(CHAPTER 11 ENGERY EFFICENCY)
(SECTION N1101 GENERAL)
N1101.5 (R103.2) Information on construction documents. Construction documents shall be drawn to scale on suitable material. Electronic media documents are permitted to be submitted when approved by the Code Official. Construction documents and supporting secondary documentation shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include the following as applicable:
1.	Energy compliance path.
2.	Insulation materials and their R-values.
3.	Fenestration, U-factors and solar heat gain coefficients (SHGC).
4.	Area-weighted U-factor and solar heat gain coefficient (SHGC) calculations.
5.	Mechanical system design criteria.
6.	Mechanical and service water heating systems and equipment types, sizes and efficiencies.
7.	Equipment and system controls.
8.	Duct sealing, duct and pipe insulation and location.
9.	Air sealing details.
N1101.6 Defined terms.
	RESIDENTIAL BUILDING. For this code, includes detached one- and two-family dwellings and multiple single-family dwellings (townhouses) three (3) stories or less in height above grade.
	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) Application. Residential buildings shall comply with Section N1101.13.1, N1101.13.2, N1101.13.3 or N1101.13.4.
N1101.13.5 (R401.2.5) Additional energy efficiency. Delete in its entirety.
N1101.14 (R401.3) Certificate. Unless otherwise presented to the homeowner and Building Official, in writing, a permanent certificate shall be completed by the builder or other approved party and posted on a wall in the space where the furnace is located, a utility room or an approved location inside the building. Where located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label or other required labels. The certificate shall indicate the following:
1.	The predominant R-values of insulation installed in or on ceilings, roofs, walls, foundation components such as slabs, basement walls, crawl space walls and floors, and ducts outside conditioned spaces.
2.	U-factors of fenestration and the solar heat gain coefficient (SHGC) of fenestration. Where three (3) is more than one (1) value for any component of the building envelope, the certificate shall indicate both the value covering the largest area and the area weighted average value if available.
3.	The results from any required duct system and building envelope air leakage testing performed on the building.
4.	The types, sizes and efficiencies of heating, cooling and service water heating equipment. Where a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, the certificate shall indicate "gas-fired unvented room heater," "electric furnace" or "baseboard electric heater," as appropriate. An efficiency is not required to be indicated for gas-fired unvented room heaters, electric furnaces and electric baseboard heaters.
5.	Where on-site photovoltaic panel systems have been installed, the array capacity, inverter efficiency, panel tilt and orientation shall be noted on the certificate.
6.	For buildings where an Energy Rating Index score is determined in accordance with Section N1106, the Energy Rating Index score, both with and without any on-site generation, shall be listed on the certificate.
7.	The code edition under which the structure was permitted and the compliance path used.

(SECTION N1102 (R402) BUILDING THERMAL ENVELOPE)

Replace Table N1102.1.3 (R402.1.3) entitled "Insulation Minimum R-Values And Fenestration Requirements By Component" with the table provided below:

Table N1102.1.3 (R402.1.3)
Insulation Minimum R-Values And Fenestration Requirements By Componenta
Climate Zone	Fenestration U-Factorb, i	Skylightb U-Factor	Glazed Fenestration SHGCb, e	Ceiling R-Value	Wood Frame Wall R-Valueg	Mass Wall R-Valueh	Floor R-Value	Basementc, g Wall R-Value	Slabd R-Value & Depth	Crawl Spacec, g Wall R-Value
4A	.35	.60	NR	38	13	5/10	19	10ci or 13j	10, 2 ft	10/13

For SI: 1 foot = 304.8 mm.
NR = Not Required.
ci = continuous insulation.
a.	R-values are minimums. U-factors and SHGC are maximums. Where insulation is installed in a cavity that is less than the label or design thickness of the insulation, the installed R-value of the insulation shall be not 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: In Climate Zones 0 through 3, skylights shall be permitted to be excluded from glazed fenestration SHGC requirements provided that the SHGC for such skylights does not exceed 0.30.
c.	"5ci or 13" means R-5 continuous insulation (ci) on the interior or exterior surface of the wall or R-13 cavity insulation on the interior side of the wall. "10ci or 13" means R-10 continuous insulation (ci) on the interior or exterior surface of the wall or R-13 cavity insulation on the interior side of the wall. "15ci or 19 or 13 & 5ci" means R-15 continuous insulation (ci) on the interior or exterior surface of the wall; or R-19 cavity insulation on the interior side of the wall; or R-13 cavity insulation on the interior of the wall in addition to R-5 continuous insulation on the interior or exterior surface of the wall.
d.	R-5 insulation shall be provided under the full slab area of a heated slab in addition to the required slab edge insulation R-value for slabs. as indicated in the table. The slab-edge insulation for heated slabs shall not be required to extend below the slab.
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 R301.1 and Table R301.1.
g.	The first value is cavity insulation; the second value is continuous insulation. Therefore, as an example, "13 & 5" means R-13 cavity insulation plus R-5 continuous insulation.
h.	Mass walls shall be in accordance with Section R402.2.5. The second R-value applies where more than half of the insulation is on the interior of the mass wall.
i.	A maximum U-factor of 0.32 shall apply in Climate zones 3 through 8 to vertical fenestration products installed in buildings located either:
	1.	Above 4,000 feet in elevation; or
	2.	In windborne debris regions where protection of openings is required by Section R301.2.1.2 of the International Residential Code.
j.	Unfinished basements may have up to a maximum of twenty percent (20%) of the total basement wall area exposed above the outside finished grade/ground level as uninsulated concrete foundation walls. The foundation wall area above the outside grade/ground level that may be uninsulated is determined by the formula [.20 times the basement wall height of all walls (including insulated exterior frame walls for walkout basements and walls common to both basement and attached garages) times the perimeter of these basement walls]. In unfinished areas, the basement foundation wall insulation shall extend down to the basement floor slab or to a minimum of twenty-four (24) inches below outside finished grade when the grade is above the floor slab elevation.

N1102.1.5 (R402.1.5) Total UA alternative. Where the total building thermal envelope UA, the sum of U-factor times assembly area, is less than or equal to the Total UA resulting from multiplying the U-factors in Table N1102.1.2 by the same assembly area as in the proposed building, the building shall be considered to be in compliance with Table N1102.1.2. The UA calculation shall be performed using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. In addition to UA compliance, the SHGC requirements of Table N1102.1.2 and the maximum fenestration U-factors of Section N1102.5 shall be met.

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 N1102.2.2.1 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° or 0.79 rad) for purposes of calculations and demonstrating compliance.

Table N1102.1.5 Minimum Projection Factor Required by Orientation for SHGC Exception
Orientation	Projection Factor
North	>=0.40a
South	>=0.20
East	>=0.50
West	>=0.50
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.

N1102.4 (R402.4) Air leakage. The building thermal envelope may be designed and constructed to limit air leakage in accordance with the requirements of Sections N1102.4.1 through N1102.4.5.

Modify Table N1102.4.1.1 (R402.4.1.1) Entitled "Air Barrier and Insulation Installation" to read as follows:

Table N1102.4.1.1 (R402.4.1.1)a Air Barrier and Insulation Installation
Component	Air Barrier Criteria	Insulation Installation Criteria
General Requirements	A continuous air barrier shall be installed in the building envelope. Breaks or joints in the air barrier shall be sealed.	Air-permeable insulation shall not be used as a sealing material.
Ceiling/attic	The air barrier in any dropped ceiling or soffit shall be aligned with the insulation and any gaps in the air barrier sealed. Access openings, drop-down stairs or knee wall doors to unconditioned attic spaces shall be weatherstripped.	The insulation in any dropped ceiling/soffit shall be aligned with the air barrier.
Walls	The junction of the foundation and sill plate shall be sealed.	Cavities within corners and headers of frame walls shall be insulated by completely filling the cavity with a material having a thermal resistance, R-value, of not less than R-3 per inch. Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and continuous alignment with the air barrier.
Windows, skylights and doors	The space between framing and skylights, and the jambs of windows and doors, shall be sealed.	—
Rim joists	Rim joists shall include an exterior air barrier.b	Rim joists shall be insulated.
Floors, including cantilevered floors and floors above garages	The air barrier shall be installed at any exposed edge of insulation.	Floor framing cavity insulation shall be installed to maintain permanent contact with the underside of subfloor decking. Alternatively, floor framing cavity insulation shall be in contact with the top side of sheathing, or continuous insulation installed on the underside of floor framing and extending from the bottom to the top of all perimeter floor framing members.
Basement crawl space, and slab foundations	Exposed earth in unvented crawl spaces shall be covered with Class I vapor retarder/air barrier in accordance with Section N1102.2.10 (R402.2.10). Penetrations through concrete foundation walls and slabs shall be air sealed. Class 1 vapor retarders shall not be used as an air barrier on below-grade walls and shall be installed in accordance with Section R702.7	Crawl space insultation, where provided instead of floor insulation, shall be installed in accordance with Section N1102.2.10 (R402.2.10).
Shafts, penetrations	Duct and flue shafts and other similar penetrations to exterior or unconditioned space shall be sealed to allow for expansion, contraction and mechanical vibration. Utility penetrations of the air barrier shall be caulked, gasketed or otherwise sealed and shall allow for expansion, contraction of materials and mechanical vibration.	Insulation shall be fitted tightly around utilities passing through shafts and penetrations in the building thermal envelope to maintain required R-value.
Narrow cavities	Narrow cavities of 1 inch or less that are not able to be insulated shall be air sealed.	Batts to be installed in narrow cavities shall be cut to fit or narrow cavities shall be filled with insulation that on installation readily conforms to the available cavity space.
Garage separation	Air sealing shall be provided between the garage and conditioned spaces.	Insulated portions of the garage separation assembly shall be installed in accordance with Sections R303 and N1102.2.7 (R402.2.7).
Recessed lighting	Recessed light fixtures installed in the building thermal envelope shall be sealed in accordance with Section N1104.4.5 (R402.4.5).	Recessed light fixtures installed in the building thermal envelope shall be airtight and IC rated, and shall be buried or surrounded with insulation.
Plumbing, wiring or other obstructions	All holes created by wiring, plumbing or other obstructions in the air barrier assembly shall be air sealed.	Insulation shall be installed to fill the available space and surround wiring, plumbing, or other obstructions, unless the required R-value can be met by installing insulation and air barrier systems completely to the exterior side of the obstructions.
Shower/tub on exterior wall	The air barrier installed at exterior walls adjacent to showers and tubs shall separate the wall from the shower or tub.	Exterior walls adjacent to showers and tubs shall be insulated.
Electrical/phone box on exterior walls	The air barrier shall be installed behind electrical and communication boxes. Alternatively, air-sealed boxes shall be installed.	—
HVAC register boots	HVAC supply and return register boots that penetrate building thermal envelope shall be sealed to the subfloor, wall covering or ceiling penetrated by the boot.	—
Concealed sprinklers	Where required to be sealed, concealed fire sprinklers shall only be sealed in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings.	—

For SI: 1 inch = 25.4 mm.
a.	Inspection of log walls shall be in accordance with the provisions of ICC 400.
b.	Air barrier and insulation full enclosure is not required in unconditioned/ventilated attic spaces and at rim joists.

N1102.4.1.2 (R402.4.1.2) Testing. Any building or dwelling unit may be tested for air leakage. The maximum design air leakage rate for any building or dwelling unit under any compliance path shall not exceed 5.0 air changes per hour or 0.28 cubic feet per minute (CFM) per square foot [0.0079 m3/(s x m2)] of dwelling unit enclosure area. For any building or dwelling unit designed for 3.0 or less air changes per hour, testing shall be conducted in accordance with ANSI/RESNET/ICC 380, ASTM E779 or ASTM E1827 and reported at a pressure of 0.2 inch 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 have been sealed.
Exception: For heated, attached private garages and heated, detached private garages accessory to one- and two-family dwelling and townhouses not more than three (3) stories above grade plane in height, building envelope tightness and insulation installation shall be considered acceptable where the items in Table N1102.4.1.1, applicable to the method of construction, are field verified. Where required by the Code Official, an approved third party, independent from the installer shall inspect both the air barrier and insulation installation criteria. Heated, attached private garage space shall be thermally isolated from all other conditioned spaces in accordance with Sections N1102.2.12 and N1102.3.5, as applicable.
During testing:
1.	Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weatherstripping 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, where installed at the time of the test, shall be open.
4.	Exterior or interior terminations for continuous ventilation systems shall be sealed.
5.	Heating and cooling systems, where installed at the time of the test, shall be turned off.
6.	Supply and return registers, where installed at the time of the test, shall be fully open.
Exception: When testing individual dwelling units, an air leakage rate not exceeding 0.30 cubic feet per minute per square foot [0.008m3/(s x m2)] of the dwelling unit enclosure area, tested in accordance with ANSI/RESNET/ICC 380, ASTM E779 or ASTM E1827 and reported at a pressure of 0.2 inch water gauge (50 Pa), shall be permitted in all climate zones for:
1.	Attached single- and multiple-family building dwelling units.
2.	Buildings or dwelling units that are one thousand five hundred (1,500) square feet (139.4m2) or smaller.
Mechanical ventilation shall be provided in accordance with Section M1505 of this code or Section 403.3.2 of the International Mechanical Code, as applicable, or with other approved means of ventilation.
N1102.4.1.3 (R402.4.1.3) Leakage rate. Where complying with Section N1101.13.1. the building or dwelling unit shall have a design air leakage rate not exceeding 5.0 air changes per hour.
N1102.4.4 (R402.4.4) Rooms containing fuel-burning appliances. In Climate Zones 3 through 8, where open combustion airducts 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 that is isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table N1102.1.3, 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 an R-value of not less than 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.

(SECTION N1103 (R403) SYSTEMS)
N1103.3.4 (R403.3.4) 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.
3.	A duct air leakage test shall not be required where the ducts and air handlers are located entirely within the building thermal envelope.
N1103.3.5 (R403.3.5) Duct testing. Ducts shall be pressure tested in accordance with ANSI/RESNET/ICC 380 or ASTM E1554 to determine air leakage by one (1) of the following methods:
1.	Rough-in test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the system, including the manufacturer's air handler enclosure if installed at the time of the test. Registers shall be taped or otherwise sealed during the test.
2.	Postconstruction test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. Registers shall be taped or otherwise sealed during the test.
	Exceptions:
	1.	A duct air-leakage test shall not be required where the ducts and air handlers are located entirely within the building thermal envelope.
	2.	A duct air-leakage test shall not be required for ducts serving heating, cooling or ventilation systems that are not integrated with ducts serving heating or cooling systems.
N1103.3.7 (R403.3.7) Building cavities. Building framing cavities used as air plenums shall comply with Section M1601.1.1 #7.
N1103.5.2 (R403.5.2) Hot water pipe insulation. Insulation for service hot water piping with a thermal resistance, R-value, of not less than R-3 shall be applied to the following:
1.	Piping larger than three-fourths (3/4) inch (19 mm) in nominal diameter located inside the conditioned space.
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 piping.
7.	Supply and return piping in circulation and recirculation systems other than cold water pipe return demand recirculation systems.
N1103.6.1 (R403.6.1) Heat or energy recovery ventilation. Delete in its entirety.
N1103.6.2 (R403.6.2) Whole-dwelling mechanical ventilation system fan efficacy. Delete in its entirety.
Table N1103.6.2 (R403.6.2) "Whole-Dwelling Mechanical Ventilation System Fan Efficacya. Delete in its entirety.
N1103.6.3 (R403.6.3) Testing. Delete in its entirety.

(SECTION N 1104 (R404) ELECTRICAL POWER AND LIGHTING SYSTEMS)

N1104.2 (R404.2) Interior lighting controls. Delete in its entirety.

N1104.3 (R404.3) Exterior lighting controls. Delete in its entirety.

(CHAPTER 13 GENERAL MECHANICAL SYSTEM REQUIREMENTS)

(SECTION M1301 GENERAL)

M1301.2 Identification. Delete in its entirety.

M1301.3 Installation of materials. Delete in its entirety.

M1301.4 Plastic pipe, fittings and components. Delete in its entirety.

M1301.5 Third party testing and certification. Delete in its entirety.

(SECTION M1305 APPLIANCE ACCESS)

M1305.1.3.1 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.

(CHAPTER 15 EXHAUST SYSTEMS)

(SECTION M1502 CLOTHES DRYER EXHAUST)

M1502.4.2 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. Ducts shall not be joined with fasteners that protrude more than one-eighth (1/8) inch (3.2 mm) into the inside of the duct. Where dryer exhaust ducts are enclosed in wall or ceiling cavities, such cavities shall allow the installation of the duct without deformation.

(SECTION M1503 DOMESTIC COOKING EXHAUST EQUIPMENT)

M1503.6 Makeup air required. Where one (1) or more gas, liquid or solid fuel-burning appliance that is neither direct-vent nor uses a mechanical draft venting system is located within a dwelling unit's air barrier, each exhaust system capable of exhausting in excess of six hundred (600) cubic feet per minute (0.285m³/s) shall be mechanically or passively provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with not fewer than one (1) damper complying with Section M1503.6.2.

Exception: Makeup air is not required for exhaust systems installed for the exclusive purpose of space cooling and intended to be operated only when windows or other air inlets are open.

(CHAPTER 16 DUCT SYSTEMS)
(SECTION M1601 DUCT CONSTRUCTION)
M1601.1.1 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 two hundred fifty degrees Fahrenheit (250° F.) (121° C.).
2.	Factory-made ducts shall be listed in accordance with UL 181 and installed in accordance with the manufacturer's instructions.
3.	Fibrous glass duct construction shall conform to the SMACNA Fibrous Glass Duct Construction Standards or NAIMA Fibrous Glass Duct Construction Standards.
4.	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.
5.	The use of gypsum products to construct return air ducts or plenums is permitted, provided that the air temperature does not exceed one hundred twenty-five degrees Fahrenheit (125° F.) (52° C.) and exposed surfaces are not subject to condensation.
6.	Duct systems shall be constructed of materials having a flame spread index of not greater than two hundred (200).
7.	Stud wall cavities and the spaces between solid floor joists to be used as non-ducted air plenums shall comply with the following conditions:
	7.1.	These cavities or spaces shall not be used as a plenum for air supply.
	7.2.	These cavities or spaces shall not be a part of required fire-resistance-rated assembly.
	7.3.	Stud wall cavities shall not convey air from more than one (1) floor level.
	7.4.	Stud wall cavities and joist-space plenums shall be isolated from adjacent concealed spaces by tight-fitting fireblocking in accordance with Section R302.11. Fire-blocking materials used for isolation shall comply with Section R302.11.1.
	7.5.	Stud wall cavities in the outside walls of building envelope assemblies shall not be utilized as air plenums.
	7.6.	Building cavities used as plenums shall be sealed.
8.	Volume dampers, equipment and other means of supply, return and exhaust air adjustment used in system balancing may be provided with access.
M1601.4.1 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 UL 181A 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 without access, 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.

(SECTION M1602 RETURN AIR)
M1602.2 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.	The amount of return air taken from any room or space shall be not greater than the flow rate of supply air delivered to such room or space.
3.	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.
4.	Return air shall not be taken from a closet, 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.	Closest of the walk-in type complying with the requirements of Section R304, and where no chimney, vent or appliance is located within.
5.	For other than dedicated HVAC systems, return air shall not be taken from indoor swimming pool enclosures and associated deck areas except where the air in such spaces is dehumidified.
6.	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.
7.	Return air from one (1) dwelling unit shall not be discharged into another dwelling unit.

(CHAPTER 21 HYDRONIC PIPING)

(SECTION M2101 HYDRONIC PIPING SYSTEMS INSTALLATION)

M2101.4 Pipe penetrations. Openings through concrete or masonry building elements shall be sleeved and/or sealed in accordance with Section P2606.1.

M2105.19 Pipe penetrations. Openings for pipe penetrations in walls, floors and ceilings shall be larger than the penetrating pipe. The annular space surrounding pipe penetrations shall be protected in accordance with Section P2606.1.

M2101.26 Pipe penetrations. Openings for pipe penetrations in walls, floors and ceilings shall be larger than the penetrating pipe. The annular space surrounding pipe penetrations shall be protected in accordance with Section P2606.1.

(SECTION M2105 GROUND-SOURCE HEAT-PUMP SYSTEM LOOP PIPING)

M2105.1 Plastic ground-source heat-pump loop piping. Plastic piping and tubing material used in water-based ground-source heat-pump ground-loop systems shall conform to the standards specified in this Section when outside the scope of Missouri Department of Natural Resources (10 CSR 23).

(CHAPTER 24 FUEL GAS)
(SECTION G2408 (305) INSTALLATION)
G2408.4 (305.7) 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.
(SECTION G2442 (618) FORCED-AIR WARM-AIR FURNACES)
G2442.3 (618.3) 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 this code, 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:
		a.	The return air shall be taken from a room or space having a volume exceeding one (1) cubic foot for each ten (10) Btu/h (9.6L/W) of combined input rating of all fuel-burning appliances therein.
		b.	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.
		c.	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 sixty-four (64) square feet or greater in size 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.

(CHAPTER 26 GENERAL PLUMBING REQUIREMENTS)

(SECTION P2602 INDIVIDUAL WATER SUPPLY AND SEWAGE DISPOSAL)

P2602.1 General. The water-distribution system of any building or premises where plumbing fixtures are installed shall be connected to a public water supply, if available. A public water supply shall be considered available when the nearest property line is located within two hundred (200) feet of a public water main. Where a public water-supply system is not available, or connection to the supply is not feasible, an individual water supply shall be provided. Individual water supplies shall be constructed and installed in accordance with the applicable State and local laws. Where such laws do not address the requirements set forth in NGWA-01, individual water supplies shall comply with NGWA-01 for those requirements not addressed by State and local laws.

Sanitary drainage piping from plumbing fixtures in buildings and sanitary drainage piping systems from premises shall be connected to a public sewer, if available. A public sewer shall be considered available when the nearest property line is located within two hundred (200) feet of a public sewer. Where a public sewer is not available, the sanitary drainage piping and systems shall be connected to a private sewage disposal system in compliance with state or local requirements.

Exception: Sanitary drainage piping and systems that convey only the discharge from bathtubs, showers, lavatories, clothes washers and laundry trays shall not be required to connect to a public sewer or to a private sewage disposal system provided that the piping or systems are connected to a system in accordance with Section P2910 or P2911.

(SECTION P2603 STRUCTURAL AND PIPING PROTECTION)

P2603.5.1 Sewer depth. Building sewers that connect to private sewage disposal systems shall be a not less than eighteen (18) inches (453 mm) below finished grade at the point of septic tank connection. Building sewers shall be not less than thirty (30) inches (762 mm) below grade.

(CHAPTER 31 VENTS)

(SECTION P3103 VENT TERMINALS)

P3103.1.1 Roof extension. Open vent pipes that extend through a roof that do not meet the conditions of Section P3103.1.2 or P3103.1.3 shall terminate not less than twelve (12) inches (304 mm) above the roof or six (6) inches (150 mm) above the anticipated snow accumulation, whichever is greater.

(CHAPTER 36 SERVICES)

(SECTION E3601 GENERAL SERVICES)

E3601.8 Emergency disconnects. Delete Section in its entirety.

(CHAPTER 39 POWER AND LIGHTING DISTRIBUTION)
(SECTION E3902 GROUND-FAULT AND ARC-FAULT CIRCUIT-INTERRUPTER PROTECTION)
E3902.2 Garage and accessory building receptacles. 125-volt through 250-volt receptacles installed in garages and grade-level portions of unfinished accessory buildings used for storage or work areas and supplied by single-phase branch circuits rated one hundred fifty (150) volts or less to ground shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(2)]
Exception: Garage door opener receptacles not installed in a readily accessible location
E3902.17 Arc-fault circuit-interrupter protection. Branch circuits that supply 120-volt, single-phase, 15- and 20-ampere outlets installed in family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways shall be protected by any of following: [210.12(A)]
1.	A listed combination-type arc-fault circuit interrupter, installed to provide protection of the entire branch circuit. [210.12(A)(1)]
2.	A listed branch/feeder-type AFCI installed at the origin of the branch-circuit in combination with a listed outlet branch-circuit type arc-fault circuit interrupter installed at the first outlet box on the branch circuit. The first outlet box in the branch circuit shall be marked to indicate that it is the first outlet of the circuit. [210.12(A)(2)]
3.	A listed supplemental arc-protection circuit breaker installed at the origin of the branch circuit in combination with a listed outlet branch-circuit type arc-fault circuit-interrupter installed at the first outlet box on the branch circuit where all of the following conditions are met:
	3.1.	The branch-circuit wiring shall be continuous from the branch-circuit overcurrent device to the outlet branch-circuit arc-fault circuit interrupter.
	3.2.	The maximum length of the branch-circuit wiring from the branch-circuit overcurrent device to the first outlet shall not exceed fifty (50) feet (15.2 m) for 14 AWG conductors and seventy (70) feet (21.3 m) for 12 AWG conductors.
	3.3.	The first outlet box in the branch circuit shall be marked to indicate that it is the first outlet on the circuit. [210.12(A)(3)]
4.	A listed outlet branch-circuit-type arc-fault circuit interrupter installed at the first outlet on the branch circuit in combination with a listed branch-circuit overcurrent protective device where all of the following conditions are met:
	4.1.	The branch-circuit wiring shall be continuous from the branch-circuit overcurrent device to the outlet branch-circuit arc-fault circuit interrupter.
	4.2.	The maximum length of the branch-circuit wiring from the branch-circuit overcurrent device to the fist outlet shall not exceed fifty (50) feet (15.2 m) for 14 AWG conductors and seventy (70) feet (21.3 m) for 12 AWG conductors.
	4.3.	The first outlet box in the branch circuit shall be marked to indicate that it is the first outlet on the circuit.
	4.4.	The combination of the branch-circuit overcurrent device and outlet branch-circuit AFCI shall be identified as meeting the requirements for a system combination-type AFCI and shall be listed as such. [210.12(A)(4)]
5.	Where metal raceways, metal wireways, metal auxiliary gutters or Type MC or Type AC cable meeting the applicable requirements of Section E3908.9 with metal boxes, metal conduit bodies and metal enclosures are installed for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, a listed outlet branch-circuit type AFCI installed at the first outlet shall be considered as providing protection for the remaining portion of the branch circuit. [210.12(A)(5)]
6.	Where a listed metal or non-metallic conduit or tubing or Type MC cable is encased in not less than two (2) inches (50.8 mm) of concrete for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, a listed outlet branch-circuit type AFCI installed at the first outlet shall be considered as providing protection for the remaining portion of the branch circuit. [210.12(A)(6)]
Exception: AFCI protection shall not be required for an individual branch circuit supplying a fire alarm system where the branch circuit is installed in a metal raceway, metal auxiliary gutter, steel-armored cable, Type MC or Type AC, meeting the requirements of Section E3908.9, with metal boxes, conduit bodies and enclosures.
E3902.18. Arc-fault circuit interrupter protection for branch circuit extensions or modifications. Where branch-circuit wiring is modified, replaced, or extended in any of the areas specified in Section E3902.17, the branch circuit shall be protected by one (1) of the following:
1.	A combination-type AFCI located at the origin of the branch circuit.
2.	An outlet branch-circuit type AFCI located at the first receptacle outlet of the existing branch circuit. [210.12(B)]
Exception: AFCI protection shall not be required where the extension of the existing branch circuit conductors is not more than thirty (30) feet (9.5 m) in length and does not include any additional outlets or devices other than splicing devices. This measurement shall not include the conductors inside an enclosure, cabinet or junction box. [210.12(B) Exception]

(CHAPTER 40 DEVICES AND LUMINAIRES)

(SECTION E4002 RECEPTACLES)

E4002.14 Tamper resistant receptacles. Delete Section in its entirety.

(APPENDIX AE MANUFACTURED HOUSING USED AS DWELLINGS)
(SECTION AE101 SCOPE)
AE101.1 General. These provisions shall be applicable only to a manufactured home used as a single dwelling unit installed on any lots and shall apply to the following:
1.	Construction, alteration and repair of any foundation system that is necessary to provide for the installation of a manufactured home unit.
2.	Construction, installation, addition, alteration, repair or maintenance of the building service equipment that is necessary for connecting manufactured homes to water, fuel, or power supplies and sewage systems.
3.	Alterations, additions or repairs to existing manufactured homes. The construction, alteration, moving, demolition, repair and use of accessory buildings and structures, and their building service equipment, shall comply with the requirements of the codes adopted by this jurisdiction.
These provisions shall not be applicable to the design and construction of manufactured homes and shall not be deemed to authorize either modifications or additions to manufactured homes where otherwise prohibited.
(SECTION AE107 FEES)
AE107.1. Permit fees. Fees shall be in accordance with Section R108 of the International Residential Code as adopted by St. Charles County, Missouri.
AE107.2 Plan review fees. Delete in its entirety.
AE107.3 Other provisions. Delete in its entirety.
AE107.3.1 Expiration of plan review. Delete in its entirety.
AE107.3.2 Investigation fees — work without a permit. Delete in its entirety.
AE107.3.2.1 Investigation. Delete in its entirety.
AE107.3.2.2 Fee. Delete in its entirety.
AE107.3.3 Fee refunds. Delete in its entirety.
AE107.3.3.1 Permit fee erroneously paid or collected. Delete in its entirety.
AE107.3.3.2 Permit fee paid when no work done. Delete in its entirety.
AE107.3.3.3 Plan review fee. Delete in its entirety.

Section 500.160 through Section 500.190. (Reserved)