2018 Washington State Energy Code – (International Energy Conservation Code) - WAC 51-11
2018 International Existing Building Code-WAC 51-50
Design Wind Speed: 110 mph (Exposure B or C depending on location)
Ground Snow Load: 25 psf (Uniform, non-reducible)
Snowdrift: 25 psf ground snow loads shall be considered
Seismic Zone: D, E
Rainfall: 2 inches/hour for roof drainage design
Frost Line Depth: 18 inches
Where can I view/purchase these codes?
A variety of sources to purchase these codes are available online. They are also available for purchase directly through the Washington Association of Building Officials bookstore. Copies of the codes are always available for viewing at City Hall. Also, many libraries keep copies of current "standard codes" (though they may not include local amendments).