City of St. Charles, MO
St. Charles County
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Table of Contents
Table of Contents
[R.O. 2009 §150.020; Ord. No. 97-152, 5-8-1997; Ord. No. 02-46, 3-5-2002; Ord. No. 05-152, 5-27-2005; Ord. No. 10-152 §6, 7-21-2010; Ord. No. 15-102 §2, 5-19-2015]
A. 
The 2015 International Residential Code for One- and Two-Family Dwellings, including Appendices A, B, C, D, G, H, J, K, N, and P, except as otherwise provided in this Chapter, as published by the International Code Council, Inc., is adopted by reference as the One- and Two-Family Dwelling Code of the City and made a part of this Section as if fully set forth herein.
B. 
Wherever the phrase "Name of Jurisdiction" appears in the 2015 Edition of the International Residential Code for One- and Two-Family Dwellings, it shall be deemed to mean the City.
C. 
Nothing in Sections 500.070 and 500.080 or in the One- and Two-Family Dwelling Code hereby adopted shall be construed to affect any suit or proceeding pending in any court, or any rights acquired, or liability incurred, or any cause or causes of action acquired or existing under any act or ordinance hereby amended by Section 500.070 and 500.080. No just or legal right or remedy of any character shall be lost, impaired or affected by Sections 500.070 and 500.080.
D. 
One (1) copy of Sections 500.070 and 500.080, the 2015 Edition of the International Residential Code for One- and Two-Family Dwellings and the proposed amendments have been on file in the City Clerk's office at least ninety (90) days prior to the adoption of Sections 500.070 and 500.080.
[R.O. 2009 §150.021; Ord. No. 97-152, 5-8-1997; Ord. No. 98-494, 11-19-1998; Ord. No. 02-46, 3-5-2002; Ord. No. 05-152, 5-27-2005; Ord. No. 10-152 §6, 7-21-2010; Ord. No. 15-102 §2, 5-19-2015]
A. 
The code adopted by Section 500.070 of this Chapter is hereby amended as follows:
1. 
Section R102.4, Referenced codes and standards, is amended to read as follows:
R102.4 Referenced codes and standards. If a referenced standard is in conflict with a code independently and specifically adopted by the City, the standard in the code specifically adopted by the City shall prevail over the referenced standard.
2. 
Section R103, Department of Building Safety, is deleted.
3. 
In Section R105.2, Work exempt from permit, the following sections are amended to read as follows:
R105.2 Work exempt from permit.
Building:
1.
One-story detached accessory structures, provided that the floor area does not exceed one hundred forty-four (144) square feet, or decks/porches, provided that the floor area does not exceed twenty-five (25) square feet.
3.
Retaining walls that are not over four (4) feet (1,219 mm) in height measured from finished grade to the top of the wall, unless supporting a surcharge.
5.
Sidewalks and driveways not more than thirty (30) inches (762 mm) above adjacent grade and not over any basement or story below.
8.
Swings and other playground equipment accessory to a one- or two-family dwelling.
4. 
Section R106.3.1, Approval of construction documents, is amended to read as follows:
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 may be kept at the site of work or made available at the time of inspection and shall be open to inspection by the building official or a duly authorized representative.
5. 
Section R112, Board of Appeals, is deleted.
6. 
Section R113.4, Violation penalties, is deleted.
7. 
In Section R202, Definitions, the definitions of "Rough-In" and "Story Above Grade Plane" are amended to read as follows:
ROUGH-IN. The installation of all parts of the plumbing system that must be completed prior to the installation of fixtures. This includes DWV, water supply and built-in fixture supports. In unfinished areas, rough-ins will require waste lines only.
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 either of the following:
1.
More than six (6) feet (1,829 mm) above grade plane.
2.
More than twelve (12) feet (3,658 mm) above the finished ground level at any point.
Exception: When a crawl space or supporting wall is below a walkout basement, that supporting wall is to be engineered but will not be considered a story.
8. 
Table R301.2(1), Climatic and Geographic Design Criteria.
a. 
The following values shall be entered into the table, and Footnotes b and h to the table are amended as follows:
Ultimate Wind Speed: 115 (51)
Ground Snow Load: 20 psf
Wind Design Speed: 90 mph
Wind Topographical Effect: No
Seismic Design Category: C (unless indicated otherwise in a soils evaluation report from an approved geotechnical agency)
Weathering: Severe
Frost Line Depth: 30 inches
Termite: Heavy to Severe
Winter Design Temp: 6
Ice Barrier Underlayment Required: No
Flood Hazards: (a) 4-9-1977, (b) 8-2-1996
Air Freezing Index: 1000
Special Wind Region: No
Windborne Debris Zone: No
Mean Annual Temp: 55.2
b. 
Footnotes b and h are amended to read as follows:
b.
The frost line depth may require deeper footings than indicated in Figure R403.1(1). The jurisdiction shall fill in the frost line depth column with 30 inches, the minimum depth of footing below finish grade.
h.
The jurisdiction shall fill in this part of the table with "No."
9. 
In Section R302.1, Exterior walls, the following exceptions are added to the list of exceptions to read as follows:
6.
Cantilevered manufactured fireplaces.
7.
Roof eave overhangs.
8.
Uncovered decks.
10. 
Section R302.2, Townhouses, is amended to read as follows:
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 townhouses shall be constructed without plumbing or mechanical equipment, ducts or vents in the envity 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.
Each townhouse shall be considered a separate building and shall be separated by fire-resistance-rated wall assemblies meeting the requirements of Section R302.1 as amended for exterior walls.
Each townhouse may be separated with two (2) one-hour fire-resistant exterior walls or a common two-hour fire-resistant-rated wall. The two-hour fire-resistant common wall shall not be used for any plumbing or mechanical equipment, including duels or vents. Electrical outlet box penetrations of the common two-hour fire-resistant assembly shall be installed in accordance with Section R302.4. A parapet is required above the two-hour common wall or two (2) one-hour fire-resistant exterior walls constructed in accordance with Section R302.2.3.
11. 
Section R302.5.2, Duct penetration, is amended to read as follows:
R302.5.2 Duct penetration. Ducts in the garage and ducts penetrating the walls or ceilings separating the dwelling from the garage shall be constructed of a minimum No. 28 gauge (0.48 mm) sheet steel or other approved material and shall not have openings into the garage.
12. 
Section R302.11, Fireblocking required, is amended by amending Section 7 to read as follows:
7.
Open web or perforated truss floor joists must be covered by one (1) sheet of five-eighths-inch Type X fire-rated gypsum board (or equivalent), or a NFPA 13D or a NFPA 13R sprinkler system must be installed in the basement.
13. 
In Section R303.1, Habitable rooms, the following exception is added to the list of exceptions to read as follows:
4.
Unfinished basements and utility rooms require natural ventilation (net openable area) at the ratio of one percent (1%) of the square footage floor area served. Mechanical ventilation with outdoor air (not recirculated air) in accordance with the Mechanical Code may be substituted at a rate of .05 cfm/sq. ft. of area.
14. 
In Section R303.3, Bathrooms, the exception is amended to read as follows:
Exception: The glazed areas shall not be required where artificial light and a local exhaust system are provided. The minimum local exhaust rates shall be determined in accordance with Section M1507. Exhaust air from the space shall be exhausted directly to the outdoors or to an attic gable vent or ventilated soffit.
15. 
Section R303.4, Mechanical ventilation, is amended to read as follows:
Where the air infiltration rate of a dwelling unit is three (3) air changes per hour or less where tested with a blower door at a pressure of 0.2 inch w.c. (50 Pa) in accordance with Section N1102.4.1.2, the dwelling unit shall be provided with whole-house mechanical ventilation in accordance with Section M1507.3.
16. 
Section R303.5.2, Exhaust openings, is amended to read as follows:
Exhaust air shall not be directed below six (6) feet eight (8) inches onto public walkways.
17. 
Section R303.8, Exterior stairway illumination, is amended by adding an exception to read as follows:
Exception: Illumination is not required on residential decks that are not part of the required of egress path.
18. 
Section R306.5, Hose bibb, the following section is added to read as follows:
R306.5 Hose Bibb. Every dwelling shall provide one (1) outside frost-proof hose bibb. The hose bibb shall be protected from backflow per Section P2902.
19. 
Section R306.6, Floor Drain, the following section is added to read as follows:
R306.6 Floor Drain. All basements shall have a floor drain within twenty (20) feet of the heating/cooling system(s) and water heaters. The floor drain shall comply with Chapter 27 of the International Residential Code for One- and Two-Family Dwellings.
20. 
Section R309.5, Fire sprinklers, is amended to read as follows:
R309.5 Fire sprinklers. Private garages shall be protected by fire sprinklers where the garage wall has been designed based on Table 302.1(2), Footnote a, and the homeowner has opted to purchase a fire sprinkler system for his or her residence, as per 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 0.05 gpm/ft2. Garage doors shall not be considered obstructions with respect to sprinkler placement.
21. 
Section R310.1, Emergency escape and rescue opening required, is amended by amending the exceptions to read as follows:
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.
Habitable spaces in basements, in existing dwelling units, which are not used for sleeping rooms, are not required to have emergency escape and rescue openings when the basement is equipped with a NFPA 13D or NFPA 13R sprinkler system.
22. 
Section R311.3, Floors and landings at exterior doors, is amended to read as follows:
R311.3 Floors and landings at exterior doors. There shall be a landing or floor at each required egress 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.
Non-required means of egress doors with no landing for future deck/balcony shall be protected with a mechanical fastened thirty-six-inch tall guardrail if/when the door sill height exceeds twenty-three and one-fourth (23 1/4) inches above grade.
23. 
Section R311.3.2, Floor elevations for other exterior doors, is amended by amending the exceptions to read as follows.
Exceptions:
1.
A top landing is not required where a stairway of three (3) or fewer risers is located on the exterior side of the door, provided that the door does not swing over the stairway.
2.
Doors with no landing for future deck/balcony shall be protected by an approved guard if the door threshold is more than three (3) risers twenty-three and one-fourth (23 1/4) inches above grade.
3.
Exterior balconies less than sixty (60) square feet and only accessible from a door are permitted to have a landing less than thirty-six (36) inches measured in the direction of travel.
24. 
Section R403.1.4.1, Frost protection, is amended by amending the exceptions to read as follows:
Exceptions:
1.
Freestanding accessory structures with an area not exceeding one hundred forty-four (144) square feet and an eave height of ten (10) feet or less shall not be required to be protected.
2.
Decks not supported by a dwelling, not exceeding one hundred forty-four (144) square feet, need not be provided with footings that extend below the frost line. Footings shall not bear on frozen soil unless such frozen condition is of a permanent character.
25. 
Section R403.1.7, Footings on or adjacent to slopes, is amended to read as follows:
The placement of buildings and structures on or adjacent to slopes steeper than one (1) unit vertical in three (3) units horizontal [slope of thirty-three percent (33%)] shall conform to Sections R403.1.7.1 through R403.1.7.4 or plans as signed and sealed by a registered structural engineer.
26. 
Section R405.1, Concrete and masonry foundations, is amended by amending the exceptions to read as follows:
Exceptions:
1.
A drainage system is not required where the foundation is installed on well-drained ground or sand-gravel mixture soils according to the Unified Soil Classification System, Group I soils, as detailed in Table R405.1.
2.
Drains provided as detailed in Section R405.1.2 are approved as an alternative method to meet the requirements of this section.
27. 
Section R405, Foundation drainage, is amended to add five (5) new subsections to read as follows:
R405.1.2 Soil evaluations. An evaluation of the soil by a geotechnical engineer for the presence or absence of groundwater is required. The evaluation report shall be based on either a subsurface soil investigation or satisfactory data from adjacent areas together with an inspection of the excavation prior to pouring concrete.
R405.1.2.1 Groundwater present. Provide drain tile, perforated pipe or other approved foundation drainage systems (such as water channel system) around perimeter of the outside of the foundation and inside the foundation. Drain discharge shall be by gravity to daylight or be connected to a basement floor sump.
R405.1.2.2 No groundwater 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 pit/pump.
R405.1.2.3 Filter membranes. An approved filter membrane shall be placed over the top of the joints/pipe perforations. The tile/pipe shall be placed on two (2) inches minimum of gravel or crushed stone and have six (6) inches of minimum cover.
R405.1.2.4 Drainage system. A drainage system shall discharge by gravity to daylight or be connected to an approved sump [eighteen (18) inches in diameter by twenty-four (24) inches deep with fitted cover]. A sump pump shall be provided if the basement is finished or partially finished with pump discharge by an approved method.
28. 
Table R502.2.2.1, Deck Ledger Connection to Band Joist, is amended to read as follows:
Table R507.2
Deck Ledger Connection to Band Joist
(Deck Live Load = 40 psf; Deck Dead Load = 10 psf; Snow Load < 40 psf)
Joist Span
6'-0" and Less
6'-1" to 8'-0"
8'-1" to 10'-0"
10'-1" to 12'-0"
12'-1" to 14'-0"
14'-1" to 16'-0"
16'-1" to 18'-0"
Connection details
On-center spacing of fastenersd, e
1/2" diameter lag screw with 1/2" maximum sheathing
16
16
16
15
13
11
10
1/2" diameter bolt with 1/2" maximum sheathing
24
24
24
24
24
21
19
1/2" diameter bolt with 1" maximum sheathing
24
24
24
24
21
18
16
29. 
Section R905.2.8.2, Valleys, is amended to read as follows:
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 be 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) plies of No. 15 felt complying with ASTM D 226 Type 1, ASTM D 4869 Type 1, or ASTM D 6757, or valley lining as described in Item 1 and 2 shall be permitted. Self-adhering polymer modified bitumen underlayment complying with ASTM D 1970 shall be permitted in lieu of the lining material.
30. 
Section R905.2.8.5, Drip edge, is amended to read as follows:
R905.2.8.5 Drip edge. A drip edge or equivalent 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.
31. 
Section R1005.7, Factory-built chimney offsets, is amended to add an exception to read as follows:
Exception: When chimneys are installed per manufacturer's installation instructions.
32. 
Section R1005.8, Installation, is added, which shall read as follows:
R1005.8 Installation. Factory-built chimneys shall be installed in accordance with the manufacturer's installation instructions. The flue chase for a factory-built chimney shall have a minimum of one (1) thickness of five-eighths-inch. Type X drywall or its equivalent extending to the roof sheathing of the structure applied to the inside of every portion of the flue chase that abuts a structure.
33. 
Section 1005.9, Required Fire Separation Enclosures, is added, which shall read as follows:
R1005.9 Required fire separation enclosures. All prefabricated metal chimneys shall be enclosed in a shaft with one (1) layer of five-eighths-inch, Type X drywall or equivalent from the fireplace connector to the underside of the roof sheathing securely attached with framing material. When the chimney is located on the exterior of the structure, it need only be separated by lining the exterior wall adjacent to the shaft with one (1) layer of five-eighths-inch, Type X drywall or equivalent. All joints are to be tight within one-eighth (1/8) inch or taped with a layer of joint compound. Required clearances shall be maintained between chimney and the drywall per the chimney manufacturer's specifications.
34. 
Section N1101.13 (R401.2), Compliance, is amended to read as follows:
N1101.13 (R401.2) Compliance. Projects shall comply with one 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.
35. 
Section N1102.14 (R401.3), Certificate (Mandatory), is amended to read as follows:
N1101.14 (R401.3) Certificate (Mandatory). Unless otherwise presented to the home owner 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.
36. 
Table N1102.1.2 (R402.1.2), Insulation and Fenestration Requirements by Component, is amended to read as follows:
Table N1102.1.2 (R402.1.2)
Insulation and Fenestration Requirements by Componenta
Climate Zone
Fenestration U-Factorb
Skylightb
U-Factor
Glazed
Fenestration
SHGCb, e
Ceiling R-Value
1
NR
0.75
0.25
30
2
0.40
0.65
0.25
38
3
0.35
0.55
0.25
38
4 except Marine
0.40
0.55
NR
38
5 and Marine 4
0.32
0.55
NR
49
6
0.32
0.55
NR
49
7 and 8
0.32
0.55
NR
49
Insulation and Fenestration Requirements by Componenta (Continued)
Climate Zone
Wood Frame
Wall
R-Value
Mass Wall
R-Valuei
Floor
R-Value
Basementc
Wall
R-Value
Slabd
R-Value and Depth
Crawl
Spacec Wall
R-Value
1
13
3/4
13
0
0
0
2
13
4/6
13
0
0
0
3
20 or 13 + 5h
8/13
19
5/13f
0
5/13
4 except Marine
13l, m
8/13
19
0j, k
10, 2 ft
10/13
5 and Marine 4
20 or 13 + 5h
13/17
30g
15/19
10, 2 ft
15/19
6
20 + 5
or 13 + 10h
15/20
30g
15/19
10, 4 ft
15/19
7 and 8
20 + 5
or 13 + 10h
19/21
38g
15/19
10, 4 ft
15/19
For SI: 1 foot = 304.8mm.
a.
R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed R-value of the insulation shall not be less than the R-value specified in the table.
b.
The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. Exception: Skylights may be excluded from glazed fenestration SHGC requirements in Climate Zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.
c.
"15/19" means R-15 continuous insulation on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. "15/19" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the home. "10/13" means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.
d.
R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or two (2) feet, whichever is less in Zones 1 through 3 for heated slabs.
e.
There are no SHGC requirements in the Marine Zone.
f.
Basement wall insulation is not required in warm-humid locations as defined by Figure N1101.10 or Table N1101.10.
g.
Or insulation sufficient to fill the framing cavity, R-19 minimum.
h.
The first value is cavity insulation, the second value is continuous insulation, so "13+5" means R-13 cavity insulation plus R-5 continuous insulation.
i.
The second R-value applies when more than half of the insulation is on the interior of the mass wall.
j.
Exception: Unfinished basements may have up to a maximum of twenty percent (20%) of the total basement wall area exposed above the outside finished grade/ground level as uninsulated concrete foundation walls. The foundation wall area above the outside grade/ground level that may be uninsulated is determined by the formula [.20 times the basement wall height of all walls (including insulated exterior frame walls for walkout basements and walls common to both basement and attached garages) times the perimeter of these basement walls]. In unfinished areas, the basement foundation wall insulation shall extend down to the basement floor slab or to a minimum of twenty-four (24) inches below outside finished grade when the grade is above the floor slab elevation.
k.
Basement blankets will be required only to depth of the frost line.
l.
Low expansive foam shall be used around doors and windows. Foam insulations shall be applied around all exterior wall penetrations and electrical boxes, and caulking shall be applied at the top and bottom of wall plates.
m.
Exhaust systems shall be installed in the home and designed to have the capacity to exhaust a minimum air flow rate of 50 cfm intermittent or 20 cfm continuous to help provide outside air through typical home use and passive air infiltration.
37. 
Section N1102.1.3 (R402.1.3), R-value computation, is amended to read as follows:
N1102.1.3 (R402.1.3) R-value computation. Insulation material used in layers, such as framing cavity insulation, or continuous insulation shall be summed to compute the corresponding component R-value. The manufacturer's settled R-value shall be used for blown insulation. Computed R-values may include an R-value for other building materials or air films. Where insulated siding is used for the purpose of complying with the continuous insulation requirements of Table N1102.1.2, the manufacturer's labeled R-Value for insulated siding shall be reduced by R-0.6.
38. 
Section N1102.2.1 (R402.2.1), Ceilings with attic spaces, is amended to read as follows:
N1102.2.1 (R402.2.1) Ceilings with attic spaces. Where Section R1102.1.2 would require R-38 insulation in the ceiling, installing R-30 over one hundred percent (100%) of the ceiling area requiring insulation shall be deemed to satisfy the requirement for R-38 wherever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves using averaging computation method (ACM). Similarly, where Section R1102.1.2 would require R-49 insulation in the ceiling, installing R-38 over one hundred percent (100%) of the ceiling area requiring insulation shall be deemed to satisfy the requirement for R-49 insulation wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves using averaging computation method (ACM). This reduction shall not apply to the U-factor alternative approach in Section R1102.1.4 and the total UA alternative in Section R1102.1.5.
39. 
Section N1102.4 (R402.4), Air leakage, is amended to read as follows:
N1102.4 (R402.4) Air leakage. The building thermal envelope may be designed and constructed to limit air leakage in accordance with the requirements of Sections R1102.4.1 through R1102.4.4.
40. 
Table N1102.4.1.1 (R402.4.1.1), Air Barrier and Insulation, is amended to read as follows:
Table N1102.4.1.1 (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 the exterior walls shall be sealed.
Knee walls shall be sealed.
Cavities within corners and headers of frame walls shall be insulated by completely filling the cavity with a material having a thermal resistance 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 Class I vapor retarder with overlapping joists taped.
Where provided instead of floor insulation, insulation shall be permanently attached to the crawl space walls.
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.
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 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.
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.
a. 
In addition, inspection of log walls shall be in accordance with the provisions of ICC 400.
41. 
Section N1102.4.1.2 (R402.4.1.2), Testing, is amended to read as follows:
N1102.4.1.2 (R402.4.1.2) Testing. Any building or dwelling unit when constructed substantially above the standards set forth in Table N1102.1.2 shall be tested and verified as having an air leakage rate of not exceeding five (5) air changes per hour in Climate Zone 4. Testing shall be conducted in accordance with ASTM E 779 or ASTM E 1827 and reported at a pressure of 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 weatherstripping or other infiltration control measures.
2.
Dampers, including exhaust, intake, makeup air, backdraft and flue dampers, shall be closed, but not sealed beyond intended infiltration control measures.
3.
Interior doors, 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.
42. 
Section N1102.4.5 (R402.4.5), Recessed lighting, is amended to read as follows:
N1102.4.5 (R402.4.5) Recessed lighting. Recessed luminaires penetrating the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as having an air leakage rate not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires shall be sealed with a gasket or caulk between the housing and interior wall or ceiling covering.
43. 
Section N1103.7 (R403.7), Equipment sizing and efficiency rating (Mandatory), is amended to read as follows:
N1103.7 (R403.7) Equipment sizing and efficiency rating (Mandatory). Heating and cooling equipment shall be sized in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. New or replacement heating and cooling equipment shall have an efficiency rating equal to or greater than the minimum required by federal law for the geographic location where the equipment is installed.
44. 
Section N1104.1 (R404.1), Lighting equipment (Mandatory), is amended to read as follows:
N1104.1 (R404.1) Lighting equipment (Mandatory). When provided by the builder, not less than seventy-five percent (75%) of the supplied 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.
45. 
Section N1104.1.1 (R404.1.1), Lighting equipment (Mandatory), is deleted.
46. 
Table N1105.5.2(1), Specifications for the Standard Reference and Proposed Designs, is amended to read as follows:
Table N1105.5.2(1) [R405.5.2(1)]
Specifications for the Standard Reference and Proposed Designs
Building Component
Standard Reference Design
Proposed Design
Above-grade walls
Type: mass 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 in Climate Zones 1 and 2, and 3 air changes per hour in Climate Zones 3 through 8 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 ventilation.
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.
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 Sl: 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 15 degrees (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.
47. 
Section M1301.2, Identification, is amended to read as follows:
M1301.2 Identification. Each ten-foot length of pipe and tubing and each pipe fitting utilized in a mechanical system shall bear the identification of the manufacturer.
48. 
Section M1301.5, Third party testing and certification, is deleted.
49. 
Section M1305.4.1, Ground clearance, is amended to read as follows:
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.
50. 
Section M1305.1.4.3, Electrical requirements, is amended to add one exception to read as follows:
Exception: Basements.
51. 
Section M1401.3, Equipment and appliance sizing, is amended to read as follows:
M1401.3 Equipment and appliance sizing. Heating and cooling equipment and appliances shall be sized in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies.
Exception: Heating and cooling equipment and appliance sizing shall not be limited to the capacities determined in accordance with Manual S where either of the following conditions applies:
1.
The specified equipment or appliance utilizes multistage technology or variable refrigerant flow technology, and the loads calculated in accordance with the approved heating and cooling calculation methodology are within the range of the manufacturer's published capacities for that equipment or appliance.
2.
The specified equipment or appliance manufacturer's published capacities cannot satisfy both the total and sensible heat gains calculated in accordance with the approved heating and cooling calculation methodology and the next larger standard size unit is specified.
52. 
Section M1501.1, Outdoor discharge, is amended to read as follows:
M1501.1 Outdoor discharge. The air removed by every mechanical exhaust system shall be discharged to the outdoors in accordance with Section M1506.2. Air shall not be exhausted into an attic or crawl space.
Exception: Whole-house ventilation-type attic fans that discharge into the attic space of dwelling units having private attics shall be permitted.
53. 
Section M1502.4.1, Material and size, is amended to read as follows:
M1502.4.1 Material and size. Exhaust ducts shall have a smooth interior finish and be constructed of metal having a minimum thickness of 0.0157 inch (0.3950 mm) (No. 30 gage). The duct shall be four (4) inches (102 mm) nominal in diameter.
54. 
Section M1502.4.2, Duct installation, is amended to read as follows:
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 and shall be mechanically fastened, i.e., foil tape or equivalent. Ducts shall not be joined with screws or similar fasteners that protrude more than one eighth (1/8) inch (3.2 mm) into the inside of the duct.
55. 
Section M1503.4, Make up air required, is amended to read as follows:
M1503.4 Makeup air required. Exhaust hood systems capable of exhausting in excess of 600 cubic feet per minute shall be mechanically or naturally provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.
56. 
Section M1506.3, Exhaust openings, is amended to read as follows:
M1506.3 Exhaust openings. Air exhaust openings shall terminate not less than three (3) feet (914 mm) from property lines; three (3) feet (914 mm) from operable and nonoperable openings into the building and six (6) feet (1,828 mm) from mechanical air intakes except where the opening is located three (3) feet (914 mm) above the air intake. Openings shall comply with Sections R303.5.2 and R303.6.
57. 
Section M1601.4.1, Joints, seams and connections, is amended to read as follows:
M1601.4.1 Joints, seams and connections. Joints of duct systems shall be made substantially airtight in an unconditioned area by means of tapes, mastics, liquid sealants, gasketing or other approved closure systems. Closure systems used with rigid fibrous glass ducts shall comply with UL 181A and shall be marked 181A-P for pressure-sensitive tape, 181A-M for mastic or 181A-H for heat-sensitive tape. Closure systems used with flexible air ducts and flexible air connectors shall comply with UL 181B and shall be marked 181B-FX for pressure-sensitive tape or 181B-M for mastic. Duct connections to flanges of air distribution system equipment or sheet metal fittings shall be mechanically fastened. Mechanical fasteners for use with flexible non-metallic air ducts shall comply with UL 181B and shall be marked 181B-C. Crimp joints for round metal ducts shall have a contact lap of at least 1 1/2 means of 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.
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 snap-lock and button-lock types.
58. 
Section G2408.4 (305.7), Clearances from grade, is amended to read as follows:
G2408.4 (305.7) Clearances from grade. Equipment and appliances installed at grade level shall be supported on a level concrete slab or other approved material extending not less than two (2) inches (50.8 mm) above adjoining grade or shall be suspended not less than six (6) inches (152 mm) above adjoining grade. Such supports shall be installed in accordance with the manufacturer's installation instructions.
59. 
Section P2503.5.1, Rough plumbing, is amended to read as follows:
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.
60. 
Section P2903.5, Water hammer, is amended to read as follows:
P2903.5 Water hammer. The flow velocity of the water distribution system shall be controlled to reduce the possibility of water hammer. A water-hammer arrestor shall be installed where quick-closing valves are used. Water-hammer arrestors shall be installed in accordance with the manufacturer's installation instructions. Water-hammer arrestors shall conform to ASSE 1010.
61. 
Section P2904.1, General, is amended to read as follows:
P2904.1 General. When installed, the design and installation of residential fire sprinkler systems shall be in accordance with NFPA 13D or Section 2904, which shall be considered equivalent to NFPA 13D. Partial residential sprinkler systems shall be permitted to be installed only in buildings not required to be equipped with a residential sprinkler system. Section P2904 shall apply to stand-alone and multipurpose wet-pipe sprinkler systems that do not include the use of antifreeze. A multipurpose fire sprinkler system shall provide domestic water to both fire sprinklers and plumbing fixtures. A stand-alone sprinkler system shall be separate and independent from the water distribution system. A backflow preventer shall not be required to separate a stand-alone system from the water distribution system.
62. 
Section R3201.2.1, Trap seal protection, is amended to add an exception to read as follows:
Exception: Basement floor drains will be allowed to have a deep seal.
63. 
Section E3902.2, Garage and accessory building receptacles, is amended to add an exception to read as follows:
Exception: Fastened in place garage door openers.
64. 
Section P3902.5, Unfinished basement receptacles, is amended to add exceptions to read as follows:
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 requirements of Section E3901.9.
2.
Sump pump: sump pump receptacles must be a single dedicated outlet (not a duplex) and only when a sump pump has been installed.
65. 
Section P3902.6, Kitchen receptacles, is amended to add an exception to read as follows:
Exception: Fastened-in-place appliances or outlets designated for refrigerators/freezers.
66. 
Section P3902.10, Kitchen dishwater branch circuit, is deleted.
67. 
Section P3902.14, Location of ground-fault circuit interrupters, is amended to read as follows:
E3902.14 Location of ground-fault circuit interrupters. Ground-fault circuit interrupters shall be installed only in a readily accessible location. [210.8(A)]
68. 
Section P3902.17, Arc-fault circuit interrupter protection for branch circuit extensions or modifications, is amended by amending the exception to read as follows:
Exception: AFCI protection shall not be required where the extension of the existing conductors is not more than thirty (30) feet (9.5 m) in length and does not include any additional outlets or devices. [210.12(B) Exception]
69. 
Section E4002.14, Tamper-resistant receptacles, is deleted.
70. 
Section 302.5.1 Opening protection, shall be amended to read as follows:
[Ord. No. 19-025, 2-5-2019]
302.5.1 Opening protection. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than one and three-eighths (1 3/8) inches (35 mm) in thickness, solid or honeycomb-core steel doors not less than one and three-eighths (1 3/8) inches (35 mm) thick, or twenty-minute fire-rated doors.
[1]
Note: The insulation shall be along the perimeter of the foundation wall downward from the slab a minimum distance of 24" or horizontally under the slab for a minimum of 24".
Any person who shall violate any provision of the code adopted in this Article or shall fail to comply with any of the requirements thereof or who shall erect, construct, alter or repair a building or structure in violation of an approved plan of or directive of the Code Official, or of a permit or certificate issued under the provision of this code, shall be guilty of an ordinance violation, punishable by a fine of not more than five hundred dollars ($500.00) or by imprisonment not exceeding three (3) months, or both such fine and imprisonment. Each day that a violation continues after due notice has been served shall be deemed a separate offense.