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AG105.1 Application. The provisions of this chapter shall control the design of barriers for residential swimming pools, spas and hot tubs. These design controls are intended to provide protection against potential drownings and near drowning by restricting access to swimming pools, spas and hot tubs. AG105.2 Outdoor swimming pool. Whenever a building permit is issued for construction of a new swimming pool or spa, or any building permit is issued for remodeling of an existing pool or spa, at a private, single-family home, it shall be surrounded by a barrier which shall comply with the following: 1 . The pool shall be isolated from access to a home by an enclosure that meets the requirements of AG105.5.1. 2. Solid barriers which do not have openings, such as a masonry or stone wall, shall not contain indentations or protrusions, cavities or other physical characteristics that would serve as handholds or footholds that could enable a child below the age of five years to climb over. 3. Where the barrier is composed of horizontal and vertical members and the distance between the tops of the horizontal members is less than 45 inches (1143 mm), the horizontal members shall be located on the swimming pool side of the fence. Spacing between vertical members shall not exceed 13/4 inches (44 mm) in width. Where there are decorative cutouts within vertical members, spacing within the cutouts shall not exceed 13/4 inches (44 mm) in width. 4. Where the barrier is composed of horizontal and vertical members and the distance between the tops of the horizontal members is 45 inches (1143 mm) or more, spacing between vertical members shall not exceed 4 inches (102 mm). Where there are decorative cutouts within vertical members, spacing within the cutouts shall not exceed 13/4 inches (44 mm) in width. 5. Maximum mesh size for chain link fences shall be a 21/4-inch (57 mm) square unless the fence has slats fastened at the top or the bottom which reduce the openings to not more than 13/4 inches (44 mm). 6. Where the barrier is composed of diagonal members, such as a lattice fence, the maximum opening formed by the diagonal members shall not be more than 13/4 inches (44 mm). 7. Access gates shall comply with the requirements of Section AG105.2, Items 1 through 6, and shall be equipped to accommodate a locking device. Pedestrian access gates shall open outward away from the pool and shall be self-closing and have a self-latching device. Gates other than pedestrian access gates shall have a self-latching device. Where the release mechanism of the self-latching device is located less than 60 inches (1372 mm) from the bottom of the gate, the release mechanism and openings shall comply with the following: 7.1.The release mechanism shall be located on the pool side of the gate at least 3 inches (76 mm) below the top of the gate; and 7.2.The gate and barrier shall have no opening larger than 1/2 inch (12.7 mm) within 18 inches (457 mm) of the release mechanism. 8. Where a wall of a dwelling serves as part of the barrier, one of the following conditions shall be met: