Solid barriers, which do not have openings, such as a masonry or stone wall, should not contain indentations or protrusions except for normal construction tolerances and tooled masonry joints.Openings in the barrier should not allow passage of a 4-inch diameter sphere. Where the barrier is mounted on top of the pool structure, the maximum vertical clearance between the top of the pool structure and the bottom of the barrier should be 4 inches. Where the top of the pool structure is above grade or surface, such as an above ground pool, the barrier may be at ground level, such as the pool structure, or mounted on top of the pool structure.In the case of a non-solid surface, grass or pebbles, the distance should be reduced to 2 inches. The maximum vertical clearance between the surface and the bottom of the barrier should be 4 inches measured on the side of the barrier which faces away from the swimming pool.The top of the barrier should be at least 48 inches above the surface measured on the side of the barrier which faces away from the swimming pool.
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