St. Charles County, MO
 
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Table of Contents
Table of Contents
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Editor’s Note: Former Article III, Electrical Code, containing Sections 500.030 through 500.040, was repealed 7-5-2017 by § 3 of Ord.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.
[Ord. No. 17-061 § 3, 7-5-2017; Ord. No. 19-035, 5-13-2019]
St. Charles County hereby adopts the 2015 International 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 E, G, I, J, K, M, and P, with the following amendments by additions, insertions, deletions and changes to read as follows:
(CHAPTER 1 ADMINISTRATION)
(SECTION R101 GENERAL)
R101.1 Title. These provisions 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."
(SECTION R103 DEPARTMENT OF BUILDING SAFETY)
R103.1 Creation of enforcement agency. The Division of Building and Code Enforcement of the Department of Community Development shall be the enforcement agency for this code and the Division's director shall be the building official or code official referred to in this code.
(SECTION R105 PERMITS)
R105.2 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 this jurisdiction. Permits shall not be required for the following:
Building:
1.
One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed one hundred twenty (120) square feet (11.15 m2) or two hundred (200) square feet (19 m2) for portable structures.
2.
Fences not over six (6) feet high; and, fences located in the agricultural district as defined in Section 405.060, excluding platted subdivisions in said district.
3.
Retaining walls that are not over four (4) feet (1,219 mm) in height measured from the adjacent grade 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 two (2) to one (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 forty (40) feet or less in height.
12.
Replacement of doors and 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 kW) 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, not including water heaters, where plumbing connections are not relocated.
(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 application for a permit. 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 reviewing of construction documents is not necessary to obtain compliance with this code.
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 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.
R106.90 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 building 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.
(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 R109 INSPECTIONS)
R109.90 Workmanship. All work shall be executed in a workmanlike and skilled manner so that, for example, floors are level, walls are plumb and square, windows and doors are plumb, square and easily operable, exterior building envelopes are weather-tight and exclude the elements, building materials are undamaged, and surfaces are unmarred. All work performed shall be in compliance with this code, per industry standards, and in accordance with the manufacturer's installation instructions.
(SECTION R112 BOARD 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 500.100.
(Sections 112.2, 112.3, & 112.4 are deleted in their 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 erects, constructs, alters or repairs 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)
R114.1 Notice to owner or the owner's authorized agent. For the purposes of this code, all Stop Work Orders shall be in accordance with the procedure established for the Building Code of St. Charles County, Missouri, in Section 115 of 500.100.
(Section 114.2 is deleted in its entirety.)
(CHAPTER 2 DEFINITIONS)
(SECTION R202 DEFINITIONS)
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.
More than six (6) feet (1,829 mm) above the finished ground level for more than 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.
(CHAPTER 3 BUILDING PLANNING)
(SECTION R301 DESIGN CRITERIA)
TABLE R301.2(1)
CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
GROUND SNOW LOAD
20 PSF
WIND DESIGN
Speed (MPH)
115 MPH
Topographic effects
No
Special wind region
No
Wind-borne debris
No
SEISMIC DESIGN CATEGORY
SDC C
SUBJECT TO DAMAGE FROM
Weathering
Severe
Frost line depth
30 inches
Termite
Moderate to Heavy
WINTER DESIGN TEMP
6° F.
ICE BARRIER UNDERLAYMENT
No
FLOOD HAZARDS
(See Floodplain Administrator)
AIR FREEZING INDEX
963
MEAN ANNUAL TEMP
55° F.
For SI: 1 pound per square foot = 0.0479 kPa, 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 C 34, C 55, C62, C73, C90, C129, C 145, C 216 or C 652.
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 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 97 1/2-percent 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.
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 one-hundred-year return period air freezing index (BF-days) from Figure R403.3(2) or from the one-hundred-year (ninety-nine percent (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(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.
m.
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.
(SECTION R302 FIRE-RESISTANT CONSTRUCTION)
R302.1 Exterior walls. Construction, projections, openings and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table R302.1(1); 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 five (5) feet 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 meeting the requirements of the Unified Development Ordinance (UDO) of St. Charles County and protected with 5/8 Type X gypsum.
7.
Uncovered decks meeting the requirements of the Unified Development Ordinance (UDO) of St. Charles County.
R302.2 Townhouses. Common walls separating townhouses shall be assigned a fire-resistance rating in accordance with Section R302.2, Item 1 or 2. The common wall shared by two (2) townhouses shall be constructed without plumbing or mechanical equipment, ducts or vents in the cavity of the common wall. The wall shall be rated for fire exposure from both sides and shall extend to and be tight against exterior walls and the underside of the roof sheathing. Electrical installations shall be in accordance with Chapters 34 through 43. Penetrations of the membrane of common walls for electrical outlet boxes shall be in accordance with Section R302.4.
1.
Where a fire sprinkler system in accordance with Section P2904 is provided, the common wall shall be not less than a one-hour fire-resistance-rated wall assembly tested in accordance with ASTM E 119 or UL 263.
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 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 eights (1 3/8) inches (35 mm) thick, or twenty-minute fire-rated doors.
R302.13 Fire protection of floors. This Section has been deleted in its entirety.
(SECTION R303 LIGHT, VENTILATION AND HEATING)
R303.1.90 Basements and cellars. The glazing area in basements and cellars shall not be less than one percent (1%) of the floor area served and shall be openable for natural ventilation.
R303.4 Mechanical ventilation. Where the air infiltration rate of a dwelling unit is less than five (5) air changes per hour where tested with a blower door at a pressure of two tenths (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 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 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.
(SECTION R306 SANITATION)
R306.90 Hose bibb. Every dwelling shall be equipped with two (2) remote outside frost-proof hose bibbs which shall be protected from backflow in accordance with Section P2902.4.3 of this code.
R306.91 Floor drain. All basements shall be equipped with a floor drain within twenty (20) feet of heating/cooling system(s) and water heaters and which shall comply with Chapter 27, Section P2719 of this code.
(SECTION R309 GARAGES AND CARPORTS)
R309.5 Fire sprinklers. Private garages shall be protected by fire sprinklers where the garage wall has been designed based on Table R302.1(2), Footnote a, and the homeowner has opted to purchase a fire sprinkler system for their residence in accordance with Section 67.281, RSMo. Sprinklers in garages shall be connected to an automatic sprinkler system that complies with Section P2904. Garage sprinklers shall be residential sprinklers or quick-response sprinklers, designed to provide a density of five hundredths (0.05) gpm/ft2. Garage doors shall not be considered obstructions with respect to sprinkler placement.
(SECTION R310 EMERGENCY ESCAPE AND RESCUE OPENINGS)
R310.1 Emergency escape and rescue opening required. Basements, habitable attics and every sleeping room shall have not less than one (1) operable emergency escape and rescue opening. Where basements contain one (1) or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room. Emergency escape and rescue openings shall open directly into a public way, or to a yard or court that opens to a public way.
Exceptions:
1.
Storm shelters and basements used only to house mechanical equipment not exceeding a total floor area of two hundred (200) square feet (18.58 m2).
2.
Emergency escape and rescue openings are not required in basements (other than sleeping rooms) provided the basement was built prior to January 1, 2016.
(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 two percent (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 three (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 fourth (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.
R311.7.6 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 that 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 be not less than thirty-six (36) inches (914 mm).
Exception:
1.
A floor or landing is not required at the top of an interior flight of stairs, including stairs in an enclosed garage, provided that a door does not swing over the stairs.
2.
Where not required by Section R311.3 and Section R311.3.2.
(SECTION R313 AUTOMATIC FIRE SPRINKLER SYSTEMS)
R313.1 Townhouse automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed in townhouses, in accordance with R313.90.
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. An automatic residential fire sprinkler system shall be installed in one- and two-family dwellings, in accordance with R313.90.
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.
R313.90 Sprinklers in Residential Structures. Notwithstanding the provisions of the Building Code and International Residential Code, as amended and adopted by St. Charles County, Missouri, and in accordance with Section 67.281, RSMo., a builder of one- or two-family dwellings 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 one- or two-family dwelling shall be denied the right to choose or decline to install a fire sprinkler system in such dwelling or residence being purchased.
(CHAPTER 4 FOUNDATIONS)
(SECTION R403 FOOTINGS)
Section R403.1.1 Minimum size. The minimum width, W, and thickness, T, for concrete footings shall be in accordance with Tables R403.1(1), through R403.1(4) and Figure R403.1(1) or R403.1.3, as applicable. The footing width shall be based on the load-bearing value of the soil in accordance with Table R401.4.1. Footing projections, P, shall be not less than two (2) inches (51 mm) and shall not exceed the thickness of the footing. Footing thickness and projection for fireplaces shall be in accordance with Section R1001.2. The size of footings supporting piers and columns shall be based on the tributary load and allowable soil pressure in accordance with Table R401.4.1. Footings for wood foundations shall be in accordance with the details set forth in Section R403.2, and Figures R403.1(2) and R403.1(3).
Table R403.1(4)
MINIMUM WIDTH AND THICKNESS OF CONCRETE, PRECAST AND MASONRY FOOTINGS (inches)
LOAD BEARING VALUE OF SOIL (psf)
1,500
2,000
3,000
>=4,000
Conventional light-frame construction
1-story
17
16
16
16
2-story
20
16
16
16
3-story
23
17
16
16
Masonry veneer over light frame
1-story
21
16
16
16
2-story
26
20
16
16
3-story
32
24
16
16
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
R403.1.4.1 Frost protection. Except where otherwise protected from frost, foundation walls, piers and other permanent supports of buildings and structures shall be protected from frost by one (1) or more of the following methods:
1.
Extended below the frost line specified in Table R301.2.(1).
2.
Constructed in accordance with Section R403.3.
3.
Constructed in accordance with ASCE 32.
4.
Erected on solid rock.
Exceptions:
1.
Protection of freestanding accessory structures with an area of two hundred (200) square feet (18.5 m2) or less, of light-frame construction, with an eave height of ten (10) feet (3,048 mm) or less shall not be required.
2.
Protection of freestanding accessory structures with an area of two hundred (200) square feet (18.5 m2) or less, of other than light-frame construction, with an eave height of ten (10) feet (3,048 mm) or less shall not be required.
3.
Decks not supported by a dwelling and not more than four (4) feet (1.22 m) above the surrounding grade need not be provided with footings that extend below the frost line.
R403.1.7 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 designed and sealed by a registered engineer licensed in the State of Missouri with approval from the Building Official.
(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(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) Concrete Foundation Walls
Maximum Wall Height
Maximum Depth of Unbalanced Backfill
Minimum Nominal Wall Thickness
8'-0"
7'-6" or less
8" (Note a)
9'-0"
8'-6" or less
10" (Note b)
10'0"
9'-6" or less
12" (Note c)
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.
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.
c.
Concrete foundation walls may be constructed a minimum of nominal twelve (12) inches thick. A minimum of three #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.
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.
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.
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.
Exception:
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 R405.1.90 are approved as an alternative method to meet the requirements of this Section.
R405.1.90 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.
R405.1.90.1 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.
R405.1.90.2 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.
R405.1.90.3 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 six-inch minimum cover.
R405.1.90.4 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 pit shall be provided in each basement with pump discharge by an approved method, exception may be granted by a code official.
R507.2.4 Deck lateral load connection.
The lateral load connection required by Section R507.1 shall be one (1) of the following methods:
1.
In accordance with Figure R507.2.3(1) with hold-down tension devices installed in not less than two (2) locations per deck, within twenty-four (24) inches of each end of the deck. Each device shall have an allowable stress design capacity of not less than one thousand five hundred (1,500) pounds (6,672 N).
3.
In accordance with Figure R507.2.3(2) with hold-down tension devices installed in not less than four (4) locations per deck, and each device shall have an allowable stress design capacity of not less than seven hundred fifty (750) pounds (3,336 N).
4.
Using knee braces extending from the floor system to the posts.
5.
Using a diagonal brace across the floor system installed below the floor system and attached using (2) 10d nails through the brace into each joist, or by a metal diagonal brace "cut-in" and attached to the top chords of the joist.
(CHAPTER 6 WALL CONSTRUCTION)
(SECTION R602 WOOD WALL FRAMING)
R602.7.5: Delete in its entirety and replace with the following table:
Table R602.7.5
MINIMUM NUMBER OF FULL HEIGHT STUDS AT EACH END OF HEADERS IN EXTERIOR WALLSa
MAXIMUM HEADER SPAN
(feet)
ULTIMATE DESIGN WIND SPEED AND EXPOSURE CATEGORY
<140 mph, Exposure B or < 130 mph, Exposure C
<115 mph, Exposure Bb
4
1
1
6
2
1
8
2
1
10
3
2
12
3
2
14
3
2
16
4
2
18
4
2
a.
For header spans between those given above, use the minimum number of full-height studs associated with the larger header span.
b.
The tabulated minimum number of full-height studs is applicable where jack studs are provided to support the header at each end in accordance with Table R602.7(1). Where framing anchors are used to support the header in lieu of a jack stud in accordance with footnote "d" of Table R602.7(1), the minimum number of full-height studs at each end of a header shall be in accordance with requirements for wind speed <140 mph, Exposure B.
R602.10.5.90 Tall wall areas. Provided the required number and size of brace wall panels is provided for each story in accordance with this code, and the requirements for walls in R602 are followed, additional engineered design for tall wall areas such as atriums, foyers, stairs, great rooms, etc. shall not be required.
(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 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 (2) ply of fifteen (15) pound 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 or 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 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 underlayment along rake edges.
Exception: Unless drip edge specifically is required by the Manufacturer's Installation Instructions of the roofing, 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 10 CHIMNEYS AND FIREPLACES)
(SECTION R1004 FACTORY-BUILT FIREPLACES)
R1004.90 Required fire separation enclosure. All prefabricated metal chimneys shall be enclosed in a fire-resistant shaft with one (1) layer of five-eighths (5/8) inch type "X" gypsum board from the fireplace connector to the underside of the roof sheathing, securely attached with framing material. When the chimney chase is located on an exterior wall of the structure, it need only be separated by lining the wall between the chimney chase and the exterior wall with five-eighths (5/8) type "X" inch gypsum board. All joints are to be tight within one-eighth (1/8) of an inch or tape with joint compound. Required clearances shall be maintained between the chimney and the gypsum board per chimney manufacturer's specifications.
(SECTION R1005 FACTORY-BUILT CHIMNEYS)
R1005.7 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 elbows.
Exception: When allowed by the manufacturer's installation instructions.
(CHAPTER 11 ENERGY EFFICIENCY)
(SECTION N1101 GENERAL)
N1101.6 (R202) Defined terms.
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) 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) Certificate (Mandatory). Unless otherwise presented to the homeowner and building official in writing, a permanent certificate shall be completed by the builder or registered design professional 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 list the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawl space wall and/or floor) and ducts outside conditioned spaces; U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration, and the results from any required duct system and building envelope air leakage testing done on the building. Where there is more than one (1) value for each component, the certificate shall list the value covering the largest area. The certificate shall list the types 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 list "gas-fired unvented room heater," "electric furnace" or "baseboard electric heater," as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces or electric baseboard heaters.
(SECTION N1102 BUILDING THERMAL ENVELOPE)
Table N1102.1.2 (R402.1.2) Delete in its entirety and insert the following table:
TABLE N1102.1.2 (R402.1.2)
INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT
CLIMATE ZONE
4
FENESTRATION U-FACTOR
0.35
SKYLIGHT U-FACTOR
0.60
See Note B
GLAZED FENESTRATION SHGC
NR
CEILING R-VALUE
38
WOOD FRAME WALL R-VALUE
13
MASS WALL R-VALUE
8/13
See Note I
FLOOR R-VALUE
19
BASEMENT WALL R-VALUE
0
See Note J
SLAB R-VALUE AND DEPTH
10,2 ft
See Note D
CRAWL SPACE WALL R-VALUE
10/13
See Note C
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.
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.
f.
g.
h.
i.
The second R-value applies when more than half (1/2) the insulation is on the interior of the mass wall.
j.
Band boards and cripple walls shall be insulated to R-13.
Section N1102.1.5 (R402.1.5) Total UA alternative. If the total building thermal 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 area 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: 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 degrees or 0.79 rad) for purposes of calculations and demonstrating compliance.
TABLE N1102.1.5
MINIMUM PROJECTION FACTOR REQUIRED BY ORIENTATION FOR SHGC
ORIENTATION
PROJECTION FACTOR
North
>0.40a
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 requirements.
N1102.2.4.90 Doors (except overhead garage doors). All metal doors shall be insulated.
Table N1102.4.1.1.1 (402.4.1.1)
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. The exterior thermal envelope contains a continuous air barrier. 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/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 sealed
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. The junction of the top plate and the top of exterior walls shall be sealed. Knee walls shall be sealed.
Cavities within comers and headers of frame walls shall be insulated by completely filling the cavity with a material having a thermal resistance of R-3 per inch minimum. 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 window/door jambs and framing, and skylights and framing shall be sealed.
Rim joists
Rim joists shall include the air barrier
Rim joists shall be insulated.
Floors (including above garage and cantilevered floors)
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, or floor framing cavity insulation shall be permitted to be in contact with the top side of sheathing, or continuous insulation installed on the underside of floor framing; and extends from the bottom to the top of all perimeter floor framing members.
Crawl space walls
Exposed earth in unvented crawl spaces shall be covered with a Class I vapor retarder with overlapping joints taped.
Where provided instead of floor insulation, insulation shall be permanently attached to the crawl space walls.
Shafts, penetrations
Duct shafts, utility penetrations, and flue shafts opening to exterior or unconditioned space shall be sealed.
Narrow cavities
Batts in narrow cavities shall be cut to fit, or narrow cavities shall be filled by insulation that on installation readily conforms to the available cavity space.
Garage separation
Air sealing shall be provided between the garage and conditioned spaces.
Recessed lighting
Recessed light fixtures installed in the building thermal envelope shall be sealed to the drywall
Recessed light fixtures installed in the building thermal envelope shall be sealed to the drywall by means such as, but not limited to, a gasketed fixture.
Plumbing and wiring
Batt insulation shall be cut neatly to fit around wiring and plumbing in exterior walls, or insulation that on installation readily conforms to available space shall extend behind piping and wiring.
Shower/tub on exterior wall
The air barrier installed at exterior walls adjacent to showers and tubs shall separate them from the showers and tubs.
Exterior walls adjacent to showers and tubs shall be insulated.
Electrical/phone box on exterior walls
The air barrier shall be installed behind electrical or communication boxes or air-sealed boxes shall be installed.
HVAC register boots
HVAC register boots that penetrate building thermal envelope shall be sealed.
Concealed sprinklers
When 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.
N1102.4.1.2 (R402.4.1.2) Testing Option. If testing is elected, the building or dwelling unit shall be tested and verified as having an air leakage rate of less than five (5) air changes per hour. 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.
N1102.4.1.90 Inspection option. The items listed in Table N1102.4.1.1 (402.4.1.1), applicable to the method of construction, are field verified.
N1102.4.4 (R402.4.4) 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.
(SECTION N1103 SYSTEMS)
N1103.1.1 (R403.1.1) Programmable thermostat. Delete in its entirety.
N1103.3.2 (R403.3.2) Sealing (Mandatory). 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.
For ducts having a static pressure classification of less than two (2) inches of water column (500 Pa), additional closure systems shall not be required for continuously welded joints and seams, and locking-type joints and seams of other than the snap-lock and button-lock types.
3.
Sealing is not required where the air handler and ducts are located within conditioned space as determined by the Building Code Official.
N1103.3.3 (R403.3.3) Duct testing (Optional). Ducts may be pressure tested to determine air leakage by one (1) of the following methods:
N1103.3.5 (R403.3.5) Building cavities (Mandatory). Delete in its entirety.
N1103.4.1 (R403.4.1) Protection of piping insulation. Piping insulation exposed to weather shall be protected from damage, including that caused by sunlight, moisture, equipment maintenance and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Adhesive tape shall not be permitted.
Exception: Line sets between the structure and the condensing unit.
N1103.5.3 (R403.5.3) 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 fourth (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) Mechanical ventilation. Mandatory where required by N1102.4.1.2. If, in accordance with N1102.4.1.2, the resulting air changes per hour (ACH) at fifty (50) Pascals is less than five (5) air changes per hour, the building shall 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 shall have automatic or gravity dampers that close when the ventilation system is not operating.
(SECTION N1104 ELECTRICAL POWER AND LIGHTING SYSTEMS)
N1104.1 (R404.1) Lighting equipment (Optional). Not less than seventy-five percent (75%) of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or not less than seventy-five percent (75%) of the permanently installed lighting fixtures shall contain only high-efficacy lamps.
Exception: Low-voltage lighting.
(SECTION N1105 SIMULATED PERFORMANCE ALTERNATIVE)
TABLE N1105.5.2(1) [R405.5.2(1)]
SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS
BUILDING COMPONENT
STANDARD REFERENCED DESIGN
PROPOSED DESIGN
Above-grade walls
Type: mass wall 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 absorptance = 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
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 areab = 15% of the conditioned floor area
As proposed
Orientation: equally distributed to 4 cardinal compass orientations (N, E, S and W)
As proposed
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 5 air changes per hour at a pressure of 0.2 inches w.g. (50 Pa). 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 (Nbr + 1)
where:
CFA = conditioned floor area
Nbr = number of bedrooms
Energy recovery shall not be assumed for mechanical
For residences that are not tested, the same air leakage rate as the standard reference design. For tested residences, the measured air exchange ratea. The mechanical ventilation rateb 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 (Nbr + 1)
Where:
CFA = conditioned floor area
Nbr = number of bedrooms
As proposed
Internal gains
IGain = 17,900 + 23.8 x CFA + 4104 x Nbr (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 elementc 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 systemsd, e
Fuel type: same as the proposed design
Efficiencies:
Electric: air-source heat pump with prevailing Federal minimum standards.
Non-electric furnaces: natural gas furnace with prevailing Federal minimum standards.
Non-electric boilers: natural gas boiler with prevailing Federal minimum standards.
Capacity: sized in accordance with Section N1103.7.
As proposed
Cooling systemsd, f
Fuel type: electric
Efficiency: in accordance with prevailing Federal minimum standards
Capacity: sized in accordance with Section N1103.7
As proposed
Service water heatingd, e, f
Fuel type: same as proposed design
Efficiency: in accordance with prevailing Federal minimum standards
Use: gal/day = 30 + 10 x Nbr
Tank temperature: 120° F.
Where:
Nbr = number of bedrooms
As proposed
Same as 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 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 setpoint = 75° F. Heating temperature setpoint = 72° F.
Same as standard reference
For SI: 1 square foot = 0.93 m2; 1 British thermal unit = 1055J; 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 forty-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 forty-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.
(CHAPTER 13 GENERAL MECHANICAL SYSTEM REQUIREMENTS)
(SECTION M1301 GENERAL)
M1301.2 Identification. Each length of pipe and tubing as produced by the manufacturer and prior to use in the field, and each pipe fitting utilized in a mechanical system shall bear the identification of the manufacturer.
Exception: Line sets and similar materials, provided the installer can provide documentation related to the material used such as, but not limited to, a receipt, invoice, or container.
(SECTION M1305 APPLIANCE ACCESS)
M1305.1.4.1 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.
M1305.1.4.3 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
(SECTION M1307 APPLIANCE INSTALLATION)
M1307.2 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 lover 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.
(CHAPTER 14 HEATING AND COOLING EQUIPMENT AND APPLIANCES)
(SECTION M1411 HEATING AND COOLING EQUIPMENT)
M1411.3.1 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 of not less than one eighths (1/8) unit vertical in twelve (12) units horizontal (one-percent slope). Drain piping shall be not less than three fourth (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 six hundred twenty-five ten-thousandths (0.0625) inch (1.6 mm).
2.
A separate overflow drain line shall be connected to the drain pan installed with the equipment. This overflow drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The overflow drain line shall connect to the drain pan at a higher level than the primary drain connection.
3.
An auxiliary drain pan without a separate drain line shall be installed under the coils on which condensation will occur. This pan shall be equipped with a water level detection device conforming to UL 508 that will shut off the equipment served prior to overflow of the pan. The pan shall be equipped with a fitting to allow for drainage. The auxiliary drain pan shall be constructed in accordance with Item 1 of this Section.
4.
A water level detection device conforming to UL 508 shall be installed that will shut off the equipment served in the event that the primary drain is blocked. The device shall be installed in the primary drain line, the overflow drain line or the equipment supplied drain pan, located at a point higher than the primary drain line connection and below the overflow rim of such pan.
M1411.8 Locking access port caps. Delete in its entirety.
(CHAPTER 15 EXHAUST SYSTEMS)
(SECTION M1502 CLOTHES DRYER EXHAUST)
M1502.4.1 Material and size. Exhaust ducts shall have a smooth interior finish and be constructed of metal having a minimum thickness of one hundred fifty-seven ten-thousandths (0.0157) inches (0.3950 mm). The duct shall be four (4) inches (102 mm) nominal in diameter.
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 eighths (1/8) inch (3.2 mm) into the inside of the duct.
(SECTION M1503 RANGE HOODS)
M1503.4 Makeup air required. Exhaust hood systems capable of exhausting in excess of six hundred (600) cubic feet per minute (0.285m3/s) 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 not less than one (1) damper. Each damper shall be a gravity damper or an electrically operated damper that automatically opens when the exhaust system operates. Dampers shall be accessible for inspection, service, repair and replacement without removing permanent construction or any other ducts not connected to the damper being inspected, serviced, repaired or replaced.
(SECTION M1601 DUCT SYSTEMS)
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.) (one hundred twenty-one degrees Celsius (121° C.)).
2.
Factory-made ducts shall be listed and labeled, as produced by the manufacturer and prior to use in the field, 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 or 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.) (fifty-two degree Celsius (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 air plenums shall comply with the following conditions:
7.1.
These cavities or spaces shall not be used as a plenum for supply air.
7.2.
These cavities or spaces shall not be part of a required fire-resistance-rated assembly.
7.3.
Stud wall cavities shall not convey air from more than one (1) floor level. Stud wall cavities shall be sealed at the floor to not draft air from the living space between the flooring and drywall.
7.4.
Stud wall cavities and joist-space plenums shall be isolated from adjacent concealed spaces by tight-fitting fireblocking in accordance with Section R602.8.
7.5.
Stud wall cavities in the outside walls of building envelope assemblies shall not be utilized as air plenums.
M1601.4.1 Joints, seams and connections. Longitudinal and transverse joints, seams and connections in metallic and non-metallic ducts shall be constructed as specified in SMACNA HVAC Duct Construction Standards - Metal and Flexible and NAIMA Fibrous Glass Duct Construction Standards. 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 nonmetallic 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 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.
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.
5.
Return air may be taken from a bedroom closet over sixty-four (64) square feet in area.
CHAPTER 21 HYDRONIC PIPING)
(SECTION G2105 GROUND-SOURCE HEAT-PUMP SYSTEM LOOP PIPING)
M2105.19 Pipe penetrations. Openings for pipe penetrations in walls, floors and ceilings shall be larger than the penetrating pipe. Openings through concrete or masonry building elements shall be sleeved, except where a drilled hole provides a natural and sufficient relieving arch as determined by the code official. The annular space surrounding pipe penetrations shall be protected in accordance with Section VP2606.1.
(CHAPTER 24 FUEL GAS)
(SECTION G2408 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 instructions.
G2409.1 (308.1) Scope. This Section shall govern the reduction in required clearances to combustible materials, including gypsum board, 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.
Exception:
Where allowed by the Manufacturer's Installation Instructions and approved by the Building Official.
(SECTION G2412 GENERAL)
G2412.9 (401.9) Identification. Each length of pipe and tubing, as produced by the manufacturer and prior to use in the field, and each pipe fitting, utilized in a fuel gas system, shall bear the identification of the manufacturer.
(SECTION G2439 CLOTHES DRYER EXHAUST)
G2439.7.4.1 (614.8.4.1) Specified length. The maximum length of the exhaust duct shall be thirty-five (35) feet (10,668 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.
(SECTION G2442 FORCED-AIR WARM-AIR FURNACES)
G2442.4 (618.4) 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 defined 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 2442.2, 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:
1.1.
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.
1.2.
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.
1.3.
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.
2.
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.
Return air may be taken from a bedroom closet over sixty-four (64) square feet in area.
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 25 PLUMBING ADMINISTRATION)
(SECTION P2503 INSPECTION AND TESTS)
P2503.5.1 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) (34 kPa) 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 Shower liner test. Delete in its entirety.
(CHAPTER 26 GENERAL PLUMBING REQUIREMENTS)
(SECTION P2602 INDIVIDUAL WATER SUPPLY AND SEWAGE DISPOSAL)
P2602.1 General. The water-distribution and drainage system of any building or premises where plumbing fixtures are installed shall be connected to a public water supply or sewer system, respectively, when these public utilities are within two hundred (200) feet of the nearest property line. Where either a public water-supply or sewer system, or both, are not available within two hundred (200) feet, or connection to them is not feasible-as determined by the Building Official, an individual water supply or individual (private) sewage-disposal system, or both, shall be provided.
(SECTION P2603 STRUCTURAL AND PIPING PROTECTION)
P2603.5 Freezing. Water, soil and waste pipes shall not be installed in exterior walls, crawl spaces or attics, unless approved by the Building Official upon a showing that such pipes installed in such locations are not at risk of freezing. Water service pipes shall be installed not less than thirty-six (36) inches (915 mm) below grade.
P2603.5.1 Sewer depth. Building sewers that connect to private sewage disposal systems shall be 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.
(SECTION P2609 MATERIALS EVALUATION AND LISTING)
P2609.1 Identification. Each length of pipe and tubing, as produced by the manufacturer and prior to use in the field, and each pipe fitting, trap, fixture, material and device utilized in a plumbing system shall bear the identification of the manufacturer and any markings required by the applicable referenced standards. Nipples created from the cutting and threading of approved pipe shall not be required to be identified.
Exception: Where the manufacturer identification cannot be marked on pipe fittings and pipe nipples because of the small size of such fittings, the identification shall be printed on the item packaging or on documentation provided with the item.
(CHAPTER 28 WATER HEATERS)
(SECTION P2801 GENERAL)
P2801.8 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.
(CHAPTER 29 WATER SUPPLY AND DISTRIBUTION)
(SECTION P2903 WATER SUPPLY SYSTEM)
P2903.5 Water hammer. The flow velocity of the water distribution system shall be controlled to reduce the possibility of water hammer. Water-hammer arrestors shall be installed in accordance with the manufacturer's instructions. Water-hammer arrestors shall conform to ASSE 1010. A water-hammer arrestor shall be installed where quick-closing valves are utilized.
(SECTION P2904 DWELLING UNIT FIRE SPRINKLER SYSTEMS)
P2904.1 General. These regulations are subject to Section R313 of this code as amended by St. Charles County. The design and installation of residential fire sprinkler systems shall be in accordance with NFPA 13D or Section P2904, 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 sprinkler system from the water distribution system.
P2904.1.1 Required sprinkler locations. If installed as allowed by Section R313 of this code as amended by St. Charles County, sprinklers shall be installed to protect all areas of a dwelling unit.
(CHAPTER 31 VENTS)
(SECTION P3103 VENT TERMINALS)
P3103.1 Roof extension. Open vent pipes that extend through a roof shall be terminated not less than twelve (12) inches (304 mm) above the roof or four (4) inches (102 mm) above the anticipated snow accumulation, whichever is greater. Where a roof is to be used for assembly, as a promenade, observation deck or sunbathing deck or for similar purposes, open vent pipes shall terminate not less than seven (7) feet (2,134 mm) above the roof.
(CHAPTER 32 TRAPS)
(SECTION P3201 FIXTURE TRAPS)
P3201.2.1 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 deep trap seal used as a condensate drain.
(CHAPTER 39 POWER AND LIGHT DISTRIBUTION)
(SECTION E902 GROUND-FAULT AND ARC-FAULT CIRCUIT-INTERRUPTER PROTECTION)
E3902.2 Garage and accessory building receptacles. 125-volt, single-phase, 15- or 20-ampere receptacles installed in garages and grade-level portions of unfinished accessory buildings used for storage or work areas shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(2)]
Exception: Fastened in place garage door openers.
E3902.5 Unfinished basement receptacles. 125-volt, single-phase, 15- and 20-ampere receptacles installed in unfinished basements shall have ground-fault circuit-interrupter protection for personnel. For purposes of this Section, unfinished basements are defined as portions or areas of the basement not intended as habitable rooms and limited to storage areas, work areas, and similar areas. [210.8(A)(5)]
Exceptions:
1.
A receptacle supplying only a permanently installed fire alarm or burglar alarm system. Receptacles installed in accordance with this exception shall not be considered as meeting the requirement of Section E3901.9. [210.8(A)(5) Exception]
2.
Where a simplex receptacle is installed to serve an installed sump pump.
E3902.16 Arc-fault circuit-interrupter protection. Branch circuits that supply 120-volt, single-phase, 15- and 20-ampere outlets installed in bedrooms and sleeping areas shall be protected by any of the 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 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 fourteen (14) AWG conductors and seventy (70) feet (21.3 m) for twelve (12) AWG conductors.
3.3
The first outlet box on 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 first outlet shall not exceed fifty (50) feet (15.2 m) for fourteen (14) AWG conductors and seventy (70) feet (21.3 m) for twelve (12) AWG conductors.
4.3
The first outlet box on 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 outlet boxes and junction boxes and RMC, IMC, EMT, Type MC or steel-armored Type AC cables meeting the requirements of Section E3908.8, metal wireways or metal auxiliary gutters are installed for the portion of the branch circuit between the branch-circuit overcurrent device and the first outset, 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 is not required for an individual branch circuit supplying only a fire alarm system where the branch circuit is wired with metal outlet and junction boxes and RMC, IMC, EMT or steel-sheathed armored cable Type AC or Type MC meeting the requirements of Section E3908.8.
E3902.17 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 E3902.16, 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 conductors is not more than thirty (30) feet (9 m) in length and does not include any additional outlets or devices.
(CHAPTER 40 DEVICES AND LUMINAIRES)
(SECTION E4002 RECEPTACLES)
E4002.14 Tamper-resistant receptacles. Delete in its entirety.
(APPENDIX E 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 lot 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.
Exception: In addition to these provisions, new and replacement manufactured homes to be located in flood hazard areas as established in Table R301.2(1) of the International Residential Code shall meet the applicable requirements of Section R322 of the International Residential Code.
(SECTION AE304 FEES)
AE304.1 Permit fees. Fees shall be in accordance with Section R108 of the International Residential Code as adopted by St. Charles County, Missouri.
AE304.2 Plan review fees. Delete in its entirety.
AE304.3 Other provisions. Delete in its entirety.
AE304.3.1 Expiration of plan review. Delete in its entirety.
AE304.3.2 Investigation fees-work without a permit. Delete in its entirety.
AE304.3.2.1 Investigation. Delete in its entirety.
AE304.3.2.2 Fee. Delete in its entirety.
AE304.3.3 Fee refunds. Delete in its entirety.
AE304.3.3.1 Permit fee erroneously paid or collected. Delete in its entirety.
AE304.3.3.2 Permit fee paid when no work done. Delete in its entirety.
AE304.3.3.3 Plan review fee. Delete in its entirety.
(APPENDIX J EXISTING BUILDINGS AND STRUCTURES)
(SECTION AJ102 COMPLIANCE)
AJ102.3 Smoke detectors. Regardless of the category of work, smoke detectors shall be provided where required by Section R314.2.2.
(SECTION AJ501 ALTERATIONS)
AJ501.1 Newly constructed elements. Newly constructed elements, components and systems shall comply with the requirements of this code.
Exceptions:
1.
Openable windows may be added without requiring compliance with the light and ventilation requirements of Section R303.
2.
Newly installed electrical equipment shall comply with the requirements of Section AJ501.5.
3.
An existing stairway being rebuilt shall not be required to comply with the requirements of Section R311.7.5 if the existing space and construction does not allow for a reduction in pitch or slope.
AJ501.8 Stairs.
AJ501.8.1 Stair width. Existing stairs and handrails not otherwise being altered or modified shall be permitted to maintain their current clear width at, above and below existing handrails.
AJ501.8.2 Stair headroom. Headroom height on existing stairs being altered or modified shall not be reduced below the existing stairway finished headroom. Existing stairs not otherwise being altered shall be permitted to maintain the current finished headroom.
AJ501.8.3 Stair landing. Landings serving existing stairs being altered or modified shall not be reduced below the existing stairway landing depth and width. Existing stairs not otherwise being altered shall be permitted to maintain the current landing depth and width.
(APPENDIX M HOME DAY CARE - R-3 OCCUPANCY)
(SECTION AM101 GENERAL)
AM101.90 Sprinklers in existing buildings. Existing buildings used as a day care in accordance with this Appendix shall not be required to provide sprinkler systems.