WAC 296-150C-1040. Floors

(1) Wood floors or subfloors in kitchens, bathrooms (including toilet compartments), laundry rooms, water heater compartments, and any other areas subject to excessive moisture must be moisture resistant; or they must be made moisture resistant by sealing or by an overlay of nonabsorbent material applied with water-resistant adhesive. (2) Carpeting cannot be used under a heat producing appliance unless the appliance is listed for such use.