Section 108-019; Ord. 19355; Repealing Article VI of Chapter 6 of the City Code and enacting a new Article VI adopting the 2006 Edition of the International Residential Code for One- and Two-Family Dwellings

repealing Article VI of Chapter 6 of the City Code relating to the 2000 Edition of the International Residential Code for One- and Two-Family Dwellings and enacting in lieu thereof a new Article VI adopting the 2006 Edition of the International Residential Code for One- and Two-Family Dwellings; and fixing the time when this ordinance shall become effective.

SECTION 1. Article VI of Chapter 6 of the Code of Ordinances, City of Columbia, Missouri, relating to the 2000 Edition of the International Residential Code for One and Two-Family Dwellings is hereby repealed and in lieu thereof a new Article VI, relating to the 2006 Edition of the International Residential Code for One and Two-Family Dwellings, is hereby enacted reading in words and figures as follows:

The 2006 Edition of the International Residential Code for One- and Two-Family Dwellings, published by The International Code Council, including Appendices A, B, C, E, G, H, and N, three copies of which have been on file with the city clerk for a period of ninety (90) days prior to the adoption of this article, is hereby adopted by reference and made a part of the Code of Ordinances, City of Columbia, Missouri as fully as if set forth in its entirety. At least three (3) copies of the 2006 Edition of the International Residential Code for One- and Two-Family Dwellings shall remain on file in the office of the city clerk and shall be kept available for public use, inspection and examination.

The code adopted by this article is here by amended by substituting the following sections in lieu of these sections with corresponding numbers in the code, or, where there is no corresponding section in the code, the following sections shall be enacted as additions to the code:

R101.1 Title: These provisions shall be known as the Residential Code for One and Two-Family Dwellings of The City of Columbia, and shall be cited as such and will be referred to herein as “this code.”

R103.2 General: The building official is hereby authorized and directed to administer and enforce all provisions of this code. The building official shall be the director of public works.

R112.1 General: Any aggrieved person shall have the right to appeal a decision of the code official to the building construction codes commission. Applications for appeal shall be filed in accordance with the procedures set out in Section 112 of the Building Code of Columbia, Missouri.

R113.4 Violation penalties: Any person who shall violate a provision of this code or shall fail to comply with any of the requirements thereof, shall be guilty of a misdemeanor and upon conviction thereof, shall be punished by a fine of not more than one thousand dollars ($1000.00) or by imprisonment not exceeding one year, or by both such fine and imprisonment. Each day that a violation continues shall be deemed a separate offense.

R202 Definitions: Accessory Structure. In one and two-family dwellings not more than three stories high with separate means of egress, a building, the use of which is incidental to that of the main building and which is located on the same lot.

Ground Snow Load - 20; Wind Speed (mph) - 90; Seismic Design Category - B; Weathering - Yes, Severe; Frost Line Depth - Yes, 30-inches; Termite - Moderate to Heavy; Winter Design Temperature - +4 Degrees Fahrenheit; Ice Barrier Underlayment Required - No; Flood Hazards - As regulated by City of Columbia Ordinance; Air Freezing Index - 0 to 1000; Mean Annual Temperature - 55 degrees Fahrenheit.

R307.3 Water closet: All water closets shall be spaced at least fifteen (15) inches from the centerline of the fixture to any wall or plumbing fixture, except the centerline of the water closet may be spaced twelve (12) inches if located next to a bathtub.

R309.2 Separation required: The garage shall be completely separated from the residence and its attic area by means of 5/8-inch gypsum board or equivalent applied to the garage side.

R311.5.3 Stair treads and risers: The maximum riser height shall be 8¼-inches (20.96 cm) and the minimum tread depth shall be 9-inches (22.86 cm). The riser height shall be measured vertically between leading edges of the adjacent treads. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’ s leading edge. The walking surface of treads and landings of a stairway shall be sloped no steeper than one unit vertical in 48 units horizontal (2-percent slope). The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8-inch (9.5mm).

R311.5.8 Winders: Winders are permitted; provided that the width of the tread at a point not more than 12-inches (305 mm) from the side where the treads are narrower is not less than 9-inches, and the minimum width of any tread is not less than 6-inches (153mm). The continuous handrail required by Section R311.5.6 shall be located on the side where the tread is narrower.

R311.5.8.1 Circular stairways: Circular stairways shall have a minimum tread depth and a maximum riser height in accordance with Section 311.5.3 and the smaller radius shall not be less than twice the width of the stairway. The minimum tread depth of 9-inches shall be measured from the narrower end.

R321.1 Premises identification: Add sentence to paragraph: Arabic numerals are required and shall be a minimum height of 4-inches with ½ inch stroke of contrasting color.

Table R401.4.1 Load-Bearing pressure (pounds per square foot) column, change value for clay, sandy clay, silty clay, clayey silt, silt and sandy silt (CL, ML, MH, and CH) from 1,500 to 2,000 leaving footnote b.

R404.1 Concrete and masonry foundation walls: Add the following exceptions: Provisions 2 and 3 above shall be considered satisfied by any of the following alternatives provided the joists are toe nailed to the plate in accordance with fastener schedule table R602.3(1).

Alt. #3. A type C connection to one joist at least every four feet maximum is acceptable for 8 and 9 foot walls with not more than 8½ feet of unbalanced backfill see drawing 3.

Alt. #4. Corners, perpendicular concrete walls, and foundation offsets of at least six feet in plan length provide lateral support at those points. If such support is provided at least every 15 feet along the length of the wall in plan, soil pressure from unbalanced backfill can be transferred to those supports by providing adequate horizontal reinforcement in the foundation wall. For up to 7½ feet of unbalanced backfill on an 8-inch thick wall, horizontal reinforcement must consist of at least 2, steel #4 grade 60 reinforcement bars for every 2 feet of wall height. For up to 9 feet of unbalanced fill on an 8-inch thick wall, horizontal reinforcement must consist of at least 3, steel #4 grade 60 reinforcement bars for every 2 feet of wall height. See drawing 4 for details.

Table R404.1.1(5): Alternate concrete reinforcement equivalent table accepted by the Building Official may be used to comply with the minimum vertical reinforcement size and spacing as shown in this table, see equivalent table #1.

R802.3.1 Ceiling joist and rafter connections: Add last sentence to second paragraph: Rafter ties shall be spaced not more than four feet (1219 mm) on center.

Joints in the building conditioned envelope that are sources of air leakage, such as around window and door frames, between wall cavities and window or door frames, between wall assemblies or their sill plates and foundations, between utility service penetrations through the building envelope, shall be properly sealed with compatible and durable caulking, gasketing, weather-stripping or other materials in an approved manner.

All exterior walls shall have a vapor barrier, capable of reducing vapor transmission to less than 1 perm, installed on the inside of the warm surface side of the insulated wall or ceiling. Only those ceilings that are attached directly to the underside of the roof rafters, such as flat roofs or cathedral ceilings, are required to install the vapor barrier.

M1501.1 Outdoor discharge: List first exception as number 1. and add exception number 2.: Air may be exhausted into a soffit vent if composed of approved materials as determined by the Building Official.

M1506.2 Recirculation of air: Add exception: Air may be exhausted into a soffit vent if composed of approved materials as determined by the Building Official.

G2417.4.1 Test pressure: The test pressure to be used shall be not less than one and one-half times the proposed maximum working pressure, but not less than 30 psig, irrespective of design pressure. (Rest of section remains as stated).

G2428.3.15 Liner system sizing and connections: Delete from this section the last two sentences of paragraph which state, “Where double-wall connectors are required, tee and wye fittings used to connect to the common vent chimney liner shall be listed double-wall fittings. Connections between chimney liners and listed double-wall fittings shall be made with listed adapter fittings designed for such purpose.”

P2602.1.2 Availability: A potable public water supply system shall be considered available to a building when any portion of the property is located within two hundred twenty-five (225) feet of the public water main.

P2603.6 Freezing: A water, soil or waste pipe shall not be installed outside of a building, or concealed in outside walls, or in any place subjected to freezing temperature, unless adequate provision is made to protect such pipe from freezing by insulation, heat or both. Water pipes shall not be installed in an exterior wall cavity in one and two family dwellings. For purposes of this section exterior wall cavities shall mean all walls that rain can fall upon. Water service piping shall be installed below recorded frost penetration but not less than thirty (30) inches below grade.

P2603.7 Sewer depth: Building sewers that connect to private sewage disposal systems shall be a minimum of thirty (30) inches below finished grade at the point of septic tank connection. Building sewers shall be a minimum of thirty (30) inches below grade.

P2604.3 Backfilling: Delete last sentence from section which reads, “Loose earth shall be carefully placed in the trench in 6-inch (152mm) layers and tamped in place.”

P3005.2.4 Change of direction: Cleanouts shall be installed at each fitting with a change of direction more than 45 degrees (0.79 rad) horizontal to horizontal in the building sewer, (rest of paragraph remains as stated).

P3111.1 Type of fixtures: Add exception: Residential food waste grinders shall be allowed to discharge into a combination waste and vent system provided an air admittance valve is installed.

Except as stated in sections E3508.1.1 Exception, E3509.6.1 and E3509.7 of this ordinance, Chapters 33 through 42 of the 2006 International Residential Code are superseded by the requirements as stated in the 2005 National Electrical Code (NFPA 70-2005).

E3508.1.1 Exception: When a concrete-encased electrode and/or a ground ring are available for use in a grounding electrode system, a rod or other electrode as specified in E3508.1.4 Rod and pipe electrodes and E3508.1.5 Plate electrodes can be used as a substitute. The second rod electrode shall not be connected in series with the first rod electrode except where there exists a metal water pipe in contact with earth for ten (10) feet or more, for one- and two-family dwellings a single grounding electrode as required by the serving electrical utility shall be permitted to fill the requirements of this section.

E3509.6.1 Water Heater Jumper: The interior metal water piping bonding shall include a bonding jumper between the hot and cold waterlines at the water heater fixture if the entire system is copper excluding the service.

Appendix G, Swimming Pools, Spas and Hot Tubs, section AG105.2 Outdoor swimming pool: An outdoor swimming pool, including an in-ground, above-ground pool, hot tub or spa shall be surrounded by a barrier which shall comply with the following:

1. The top of the barrier shall be at least seventy-two (72) inches (1836 mm) above finished ground level measured on the side of the barrier which faces away from the swimming pool. The maximum vertical clearance between finished ground level and the barrier shall be two (2) inches (51 mm) measured on the side of the barrier which faces away from the swimming pool. Where the top of the pool structure is above grade, such as an above ground pool, the barrier may be at ground level, such as the pool structure, or mounted on top of the pool structure. Where the barrier is mounted on top of the pool structure, the maximum vertical clearance between the top of the pool structure and the bottom of the barrier shall be four (4) inches (102mm).

Exception: The top of the barrier shall be at least forty-eight (48) inches (1219mm) above ground level measured on the side of the barrier which faces away from the swimming pool provided the swimming pool is equipped with a rigid safety cover complying with ASTM F 1346-91.

SECTION 2. The repeal of Article VI of Chapter 6 of the Code of Ordinances, City of Columbia, Missouri, relating to the 2000 Edition of the International Residential Code for One and Two-Family Dwellings shall not affect any offense or act committed or done or any penalty or forfeiture incurred before the effective date of this ordinance.