Building Codes & Design Criteria

Adopted Building Codes

2006 International Building Code (IBC)
2006 International Residential Code (IRC)
2006 International Mechanical Code (IMC)
2021 International Plumbing Code (IPC)
2021 International Fuel Gas Code (IFGC)
2006 International Energy Conservation Code (IECC)
2006 International Fire Code (IFC)

Adopted amendments to these codes are available on the County website: www.rbc.us

Roof Snow Load by Elevation (for reference only)

ELEVATIONMINIMUM ROOF SNOW LOADMINIMUM FROST DEPTH
Below 6,000 ft40 psf36 inches
6,000 to 6,500 ft50 psf42 inches
6,501 to 7,000 ft60 psf42 inches
7,001 to 7,500 ft70 psf42 inches
7,501 to 8,000 ft80 psf48 inches
8,001 to 9,000 ft90 psf48 inches
above 9,000 ft115 psf48 inches


Actual roof snow load will be determined by the RBC Building Official

Climate Zone-6
Wind design 90 mph (3 sec) Exposure B or C
Seismic Design Category - TBD per site
Weathering probability for concrete - Severe
Ice barrier underlayment required
Floodplain (Section 245 RBC Land Use Resolution)