Pool Decks

Slip resistance: what's real and what's marketing

No California code section sets a slip-resistance number for a residential pool deck. The four-foot slip-resistant concrete deck rule people cite comes from Chapter 31B of the building code, and Chapter 31B applies to public pools. It doesn't apply to your backyard.

The number you'll see quoted is 0.55 wet DCOF, from ANSI A326.3. That's a voluntary product standard written for hard-surface flooring, and the standard itself says it doesn't predict whether a person will slip. We use it as a design benchmark. We don't present it as code, and neither should anybody else.

If a contractor quotes you ASTM C1028, they're working from old information. That test was withdrawn in 2014 with no replacement.

What actually helps: texture running across the direction of travel, generous drainage so water doesn't sheet across the surface, and no high-gloss sealer on a surface people run on.

Hardware near a pool

Pool chemistry is hard on metal. We run stainless throughout, and on hardwood there's a second reason beyond corrosion. The Forest Products Laboratory documents that high-extractive woods react with the iron in steel fasteners and stain around them, and galvanized coatings still contain iron, so staining is likely with those too.

One correction to something you'll read everywhere. The code rule requiring stainless within 300 feet of salt water is about an ocean shoreline. It isn't about a saltwater-chlorinated pool. Using 316 stainless around a pool is good practice and it's what we do. It isn't a code mandate, and anybody telling you it is has misread the section.

Heat, honestly

There's no independent published dataset comparing barefoot surface temperature across hardwood, composite and PVC. The one comparison circulating widely came from a hardwood supplier and reported three different materials at an identical temperature, which isn't a result you get from careful testing.

What is true: surface temperature comes down mostly to color and sun exposure. A dark board of any material will be unpleasant barefoot on a Valley afternoon. Pick the color outdoors, in the sun, before you commit. That will tell you more than any manufacturer's chart.

Materials around water

PVC has no wood flour in it, which is why it's the usual recommendation near a pool. Nothing organic for moisture to work on. Hardwood does very well too, and it's what we'd use if you want the look. It's dense enough that constant wetting isn't the problem people assume. More on composite and PVC decking.

Structure

Footings near a pool shell are a design question, not a table lookup. There's no prescriptive code clearance between a deck footing and a pool wall. The footing needs to sit outside the shell's zone of influence, or the shell needs to be designed for the surcharge. That's the engineer's call.

The code section people cite here, 1808.7.3, is about the setback between a pool and a slope, not between a deck and a pool. Different rule. On a hillside lot with a pool near the edge it's very relevant, just not for the reason it usually gets quoted.

The pool barrier

If we're building a deck around your pool, we'll tell you where the barrier stands, because a deck can wreck a compliant one without anybody noticing. A bench, a planter or a wide deck rail beside a fence gives a five-year-old a foothold. Climbability is an actual requirement, not a suggestion.

In unincorporated Los Angeles County, straightforward replacement of decking, tile or coping counts as cosmetic and doesn't by itself trigger the pool safety retrofit requirements. Worth knowing before somebody tells you a new deck means a whole new barrier. Other jurisdictions vary, and we check.

Call (818) 345-2866.