Prior to the adoption of Ord. 20910 on 03/21/2011, Section 6-66 read as follows.

    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.”

R103.1 Creation of enforcement agency:  Delete

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.

R104.10.1 Areas prone to flooding:  Delete

R105.2, No. 2: Fences not over twelve (12) feet high.

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.

R112.2.1 Determination of substantial improvements in areas prone to flood:  Delete

R112.2.2 Criteria for issuance of a variance for areas prone to flooding:  Delete

R112.3 Qualifications:  Delete

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.

Table 301.2 (1):  The following values shall be inserted into Table R301.2 (1):

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).

R311.5.3.1 Riser height and R311.5.3.2 Tread depth.  Delete

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. #1. Configurations where thrust from the joists is transferred to the foundation by direct bearing on the foundation, see drawing 1 for example.

    Alt. #2. A steel angle attached to the bottom of each joist as shown in drawing 2.

    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.

NOTE:  Drawings as stated above are on file in the office of the Building Official.

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.

NOTE:  Table as stated above is on file in the office of the Building Official.     

R404.5 Retaining Walls: Change 24-inches (610 mm) to read 48-inches (1219 mm); rest of paragraph remains as stated.

R613.2 Window sills:  Delete

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.

Chapter 11 Energy Efficiency section N1101.2 Compliance:  Add to paragraph:  Compliance with this section shall be obtained by the following requirements:


        Ceiling or roof -- R-38

Exterior wall -- R-15.5 for the assembly

Floor above unheated area or crawl space and ducts in ventilated attic or crawl space -- R-19

Walls separating one and two-family dwellings from garage areas, walls facing ventilated attic spaces and finished exterior basement walls -- R-13

Ducts in unheated area not exposed to outside ventilation -- R-4

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.

All windows shall have a maximum Thermal Transmittance (U) value of 0.55.

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.
G2414.5.2 Copper tubing:  Replace second paragraph with:  Copper pipe and copper tubing shall not be allowed for fuel gas piping systems.

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).

G2428.3.9.1 Tee and wye fittings:  Delete

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.”

P2602.1.1 Individual water supply:  Where a potable public water supply is not available, individual sources of potable water supply shall be utilized.

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.

P2603.2.1 Protection against physical damage:  Delete

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.”

P2903.5 Water hammer: Delete

P2904.4 Water service pipe:  Where this section references 160 pounds per square inch replace with 200 pounds per square inch.

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).

P3008.1 Backwater valves:  General: Delete

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.

P3201.2 Trap seals and trap seal protection:  delete

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 not 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.

E3509.7 Bonding other metal piping:  Delete “including gas piping” from section.

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.
    2. through 10.  Same as stated in International Residential Code.  

(Ord. No. 14119 § 1, 7-5-94; Ord. No. 15397, § 1, 10-20-97; Ord. No. 15629, § 1, 6-1-98; Ord. No. 17501, § 1, 11-4-02; Ord. No. 19355, § 1, 1-2-07; Ord. No. 19767, § 1, 12-17-07)