Fencing (C-13) · Lesson 6 of 6

Pool Barrier Fence and Gate Rules (HSC §115923, 2025 CRC Appendix CI)

"Pool Barrier Fence and Gate Rules (HSC §115923, 2025 CRC Appendix CI)" is lesson 6 of 6 in the Fencing (C-13) Learning Hub. It opens with "Why Pool Fences Have Their Own Rules" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. Why Pool Fences Have Their Own Rules
  2. The Five Characteristics of an Enclosure
  3. Height and Ground Clearance
  4. Picket Spacing: The 4-Inch Sphere Rule
  5. The Pool Gate

The worked example in the course applies this lesson to a realistic job in 6 steps, from "Write the rule" through "Check height and clearance".

What you'll be able to do

  • Explain the main idea of "Pool Barrier Fence and Gate Rules (HSC §115923, 2025 CRC Appendix CI)" in plain language you can use on the exam.
  • Apply this step with confidence: "Height and Ground Clearance".
  • Apply this step with confidence: "Picket Spacing: The 4-Inch Sphere Rule".
  • Apply this step with confidence: "The Pool Gate".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Pool Barrier Fence: HSC §115923 (2025 CRC App. CI)The enclosure a fence contractor builds around a residential poolENCLOSURE REQUIREMENTS4 in. sphere may not pass any gapGRADE60 in.minimum2 in. max under fencePartial panel at 3 px per in.PICKET COUNT, 90 IN. PANELClear span between posts = 90 in.Pickets are 3/4 in. (0.75 in.) squaregap = (90 - 0.75 x n) / (n + 1)Every gap must be under 4 in.n = 18: (90 - 13.5) / 19 = 4.03 in.FAILn = 19: (90 - 14.25) / 20 = 3.79 in.PASSn = 20: (90 - 15) / 21 = 3.57 in.marginGate: opens away from the pool,self-closing and self-latching,latch no lower than 60 in. up.Outside face: no foot or hand holds.RESULT: 19 pickets minimum (3.79 in. gaps); 20 gives marginSource: HSC §115923, 2025 CRC Appendix CI (p. 2) and CBC §3109.2; §115922 lists the two-of-seven features.CC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: Why Pool Fences Have Their Own Rules

The Swimming Pool Safety Act (Health and Safety Code §§115920-115929) is printed in 2025 CRC Appendix CI (pp. 1-4) and again in 2025 CBC §3109.2 (Chapter 31 pp. 10-12). It exists to prevent child drownings. Under §115922(a), when a permit is issued for a new or remodeled pool or spa at a private single-family home, it must have at least two of seven drowning-prevention safety features, and an enclosure that meets §115923 is one of them. "Pool" means any structure with water over 18 inches deep, including in-ground and aboveground pools, hot tubs, and spas (§115921). When the owner picks the enclosure option, the fence contractor builds the part of the system that §115923 spells out.

Step 2: The Five Characteristics of an Enclosure

§115923 (2025 CRC Appendix CI, p. 2) requires an enclosure to have all of the following: access gates that open away from the pool and are self-closing with a self-latching device placed no lower than 60 inches above the ground; a minimum height of 60 inches; a maximum vertical clearance from the ground to the bottom of the enclosure of two inches; gaps or voids, if any, that do not allow passage of a sphere equal to or greater than four inches in diameter; and an outside surface free of 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. The Appendix CI100 note adds that these rules are subject to local government modification, so verify local requirements at permit time.

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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