Wildland-Urban Interface

Richland’s building code includes special requirements for wildland areas (§21.01.030). It requires noncombustible siding or soffit material for the downhill side(s) of a building/structure which is present within 30 feet of a grade that is 15 percent or greater in steepness. The grade is determined based on the predominant slope on the downhill side measured from the structure or building and extending a maximum of 300 feet.