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2304.12.1.5 Add the following second paragraph:
Walls not accessible for maintenance shall have exterior covering of siding or plywood that are either treated wood or wood of natural resistance to decay. Plywood shall be exterior type, C-C Grade minimum, and not less than 1/2-inch (12.7 mm) thickness unless applied over sheathing. Plywood manufactured with redwood or cedar faces but with inner plys of other species conforming to DOC Standard PS1-95 may be used, provided the exposed outer face is plugged and not grooved or patterned.
Weather-exposed stairways constructed with concrete, masonry, brick, tile or terrazzo shall be supported on hot-dipped galvanized steel or reinforced concrete stringers.
EXCEPTION: In Group R, Division 3 Occupancies, wood construction on masonry or concrete foundations may be used as supports, and the area under the stair shall be ventilated in compliance with 2304.12.7.
Weather-exposed stairs of precast concrete or metal pan treads may be supported on wood stringers, provided the entire stairway is exposed and the treads are connected to the stringers by hot-dipped galvanized steel or other approved corrosion-resistant fasteners.
(Amended by Ord. 65-19, File No. 190136, App. 4/12/2019, Eff. 5/13/2019)
2304.12.3.2 Add the following section:
2304.12.3.2 Wood structural members. Wood structural members that support moisture permeable floors or roofs that are exposed to the weather, such as concrete or masonry slabs, shall be of naturally durable or preservative-treated wood unless separated from such floors or roofs by an impervious moisture barrier extending up the walls not less than 4 inches (101.6 mm) or shall otherwise be adequately flashed and counter flashed.
Regardless of finish flooring type or structural materials, the wood sub-floor of toilet rooms and bathrooms shall be protected by a waterproof membrane. Where a single ply sheet membrane is used, all adhesives shall be of a waterproof type and shall be applied so as to form a full unbroken coat between the backing and the membrane being applied. All seams and joints shall be thoroughly sealed.
Exception: Interior floors in Group R, Division 3 Occupancies.
(Amended by Ord. 65-19, File No. 190136, App. 4/12/2019, Eff. 5/13/2019)