(1) The International Residential Code (IRC) is a nationally recognized model code setting forth minimum standards and requirements for detached one or two family dwellings and multiple single-family dwellings (townhouses) not more than three stories above grade in height, and their accessory structures. The IRC also provides a framework for program administration.

(2) The Department of Labor and Industry adopts and incorporates by reference the International Residential Code, 2006 Edition, referred to as the International Residential Code or IRC.

(3) Chapters 11 through 42, inclusive, are deleted in their entirety.

(4) Subsection R301.6, Roof Load, is deleted and replaced with the following: "Snow loads shall be determined by the building official. In areas of the state outside of certified city, county, or town jurisdictions, the design snow load shall be based on the ground snow loads developed in "Snow Loads for Structural Design in Montana", Civil Engineering Department, Montana State University, 2004 revised edition. The minimum design roof snow load after allowed reductions shall be 30 psf unless justified by a Montana licensed design professional to the satisfaction of the building official. Coefficients and factors other than those specified in the building code may be used when justified by a Montana licensed design professional to the satisfaction of the building official."

(5) Subsection R311.5.3.1, Riser Height, is amended to allow a maximum riser height of 8 1/4 inches.

(6) Subsection R311.5.3.2, Tread Depth, is amended to allow a minimum tread depth of nine inches (229 mm).

(7) Subsection R405.1 is amended by adding the following: "A drainage system is not required when continuous rain gutters are installed incorporating drain extensions which divert storm water a minimum of six feet (1.83 m) away from the foundation and grading is done in accordance with R401.3. A drainage system may be required where high water tables are known to exist or geological conditions which require a soils engineering report, performed in accordance with R401.4, specify the need for foundation drainage."

(8) Appendices do not apply unless specifically adopted by the department.

(9) A copy of the International Residential Code may be obtained from the Department of Labor and Industry, Bureau of Building and Measurement Standards, P.O. Box 200517, 301 South Park, Helena, MT 59620-0517, at cost plus postage and handling. A copy may also be obtained by writing to the International Code Council, 4051 West Flossmoor Road, Country Club Hills, IL 60478-5795.