- (1) All weather-exposed surfaces must have a weather resistive barrier. Such barrier must be of waterproof building paper or asphalt saturated felt. Building paper, felt, or equivalent materials must be covered with siding as a protection against damage. Weatherproof sheathing may be used to meet this requirement.
- (2) When weatherproof sheathing is used for the weather resistive barrier protection, it must be of the exterior type not less than three-eighths inch thick. Joints must occur over framing members and must be protected by built-in edge laps, a continuous wood batten, caulking, flashing, or by an equivalent material installed per the manufacturer's specifications.
- (3) All wood siding and trim must be painted to protect from weather damage.
- (4) Flashing. All exterior openings exposed to the weather must be flashed in such a manner as to make them weatherproof.
[Statutory Authority: RCW 70.114A.081. WSR 99-03-065, § 246-359-240, filed 1/18/99, effective 2/18/99.]