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The contact surface area of the block shall be 8 square inches (51.61 square cm) to simulate the ball of the foot (reference (d) of § 1207.11).

A wooden block shall be prepared in accordance with figure C. The tread and the foot shall be wet for this test. The angle of repose is the angle formed by the intersection of the ladder rails and the line connecting the user's feet and center of gravity. The performance test is designed to insure that all tread slip-resistant surfaces shall have the ability to maintain a barefooted 50-percentile adult male (reference (d) of § 1207.11) at an angle of repose of 33° ☑° without movement with a safety factor of 2.0. The tread surface of all swimming pool slide ladders shall have a slip-resistant surface that is either an integral part of or permanently attached to the ladder steps. If slide ladder tread surfaces are curved, they shall not have a radius of curvature less than seven times the tread width. If stairs or ramps are used to ascent to the top of the slide, they shall be designed in accordance with reference (c) of § 1207.11, pages 457-463. When tread design ladders are used, the minimum installed angle shall be not less than 15° from a plumbline dropped from a ladder step as shown in figure A. Swimming pool slide ladders not using rungs shall be designed and installed in such a manner that the user's center of gravity will be approximately positioned directly over each step during the use of the ladder. Swimming pool slide ladders, steps, stairs, or ramps shall have treads, not rungs, if the angle of the incline is 15° or greater from a plumbline.

If edge guards are used, they shall be permanently affixed to the structure in a tamper-proof fashion.

Edges of swimming pool slide runways, ladders, handrails, and deck anchor flanges shall be designed, finished (deburred, polished, etc.), or protected in such a manner as to prevent cutting human tissue on casual contact and intended use.

The strength of the assembled and installed swimming pool slide shall be such that no structural failures of any component part shall cause failures of any other component part of the slide as described in the performance tests in paragraphs (d)(4) and (f)(9) of this section.