(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.