Composite decking around pools: heat, slip, salt and chlorine

A pool surround is one of the strongest cases for composite, as long as you choose the board for it. Around a pool, a timber deck takes splash all summer and still needs a yearly clean and oil, which one Whirlpool member said isn't fun on their own merbau deck¹³. One maker sells its capped boards as splinter-free and unaffected by chlorine or salt water pools. They bring two problems of their own. A dark board in full sun can be too hot to walk on, and wet grip depends on the exact board rather than on the word composite. I'd settle both when choosing the board.

Composite decking around a pool: what owners get and what they give up

The makers' reasons for using composite here are easy to find, and one maker's FAQ states the trade-off that comes with them. Its boards get hotter than timber in direct sunlight because of the plastic content, it says, and it compares them to concrete on a hot day¹. It also tells buyers to test the product barefoot to make sure it suits them. That's the sentence I'd keep in mind while reading the rest of the brochure.

Owners say the same from both sides. A Trex owner in New South Wales, Amy.B, gave one star about two years ago and wrote "As soon as the sun hits it, it is like walking on fire", calling it a safety issue, especially for children and pets¹⁰. Another Trex owner, Craig, wrote about five years ago that the deck, built under a large pavilion, "is next to a pool and hasn't discoloured at all"¹⁰. A NewTechWood owner in Victoria, Warren W., added a note to a review in January 2026: "you cannot walk on it in bare feet when it gets hot"¹¹. Colour is the first thing I'd check, and those reviews leave it out. Fade is a separate question, covered in the guide on fading and scratches.

Heat: colour first, shade second

A darker board absorbs more sun, so I'd treat a charcoal deck around a pool in January as the worst case. A Whirlpool member, petercollins, put it fairly in August 2024, writing "Yes the composite deck gets hot in the summer" of a 40 m² composite deck beside the pool¹³. The same post compared it to paving and beach sand, and said it was fine in the shade, which covered most of the deck in summer. In the same thread, Ballistick described laying composite samples in the sun next to several timbers and reading them with a thermal camera, and found the composites ran about 10°C hotter on average¹³. That matches the maker's own warning. Not everyone finds it so: littlearthquakes, who has put in Millboard decks at two homes, the second around a pool, didn't find it any hotter than a timber deck.

A Whirlpool thread from September 2010 shows how long this has been the worry. The owner, turbo ninja, was choosing boards for a pool deck in southern New South Wales, where summers run past 40°C, and had heard the composite board under consideration was hot to walk on¹⁴. One reply, from Brrrr, said a daughter's apartment in Perth had the same board and that in summer "it literally burns"¹⁴.

For a pool deck, I'd choose from the lightest colours in the range. Put the samples on the pool coping on a hot afternoon and stand on them barefoot, which is the test that maker asks buyers to do. I'd also plan shade over the part of the deck where people sit. The guide on why composite decking gets hot goes into aspect and shade.

Slip: ask for the wet pendulum rating

A pool surround is a wet floor, and in its notes on slip resistance the NCC treats areas exposed to the weather as wet⁶. Slip resistance in Australia is classified under AS 4586, and the NCC's stair table for houses gives a feel for the scale. It asks for P3 or R10 on dry treads and P4 or R11 on treads that can get wet⁶. A pool surround isn't a stair, but those are the classes I'd want to see on the board's data sheet as a minimum.

Makers publish them if you look. ModWood says its Xtreme Guard range is made to the highest pendulum class, P5, and that the boards are unaffected by chlorine or salt water pools³. Brite's pool decking page gives a P5 and R11 rating and says the boards resist chlorine and salt⁴. Ekodeck's install guide says its boards come with a certified slip rating under AS 4586⁵. The same guide warns that the surface may wear over time and makes testing it now and then the owner's job. That last point is the useful one, because a slip rating describes the surface as it was tested.

A ModWood owner in Victoria, Peter jaspers, posted a one-star review in August 2026 saying the decking "turns green and extremely slippery every winter" even with regular cleaning¹². I can't tell from the review whether that deck is near a pool or in shade. It's still the reason I'd keep a pool deck clean through the cooler months and keep the space under it ventilated, and the cleaning guide covers mould.

Salt, chlorine and the frame

Pool water ends up on the frame and the fixings, and the makers write that into their fixing rules. One fixing guide requires stainless steel clips, or two named clip models, around pools and anywhere within 1 km of salt water². The same guide recommends galvanised screws as the minimum for low-corrosion areas and stainless steel screws for high-corrosion areas. Another maker highly recommends sealing cut ends and ripped boards on installations around pools and spas¹.

Forum advice runs the same way. In March 2011, in that 2010 pool thread, Woodchip suggested spending a little extra on 316-grade stainless fasteners around a pool because they are far more resistant to salt corrosion, and had used them with no regrets¹⁴. In an April 2017 thread about a pool deck in a bushfire zone, highswr said a steel frame around a pool would need to be hot-dip galvanised¹⁵. A reply from adavis thought a standard galvanised section would be fine, especially for a pool that isn't salt water. I'd match the frame's coating to the water you have, and the steel framing page covers the grades.

If your pool deck sits low, everything in the ground-level deck guide applies: clearance, drainage under the boards, and an open perimeter so the frame dries.

Pool fencing and where the deck can go

A deck beside a pool is a platform, and the pool fencing rules treat it as one. Queensland's pool safety standard requires the fence to be at least 1200 mm above finished ground level, with a continuous 900 mm non-climbable zone⁷. For fences under 1800 mm it also wants 300 mm clear on the inside of the fence⁷. A NSW council's summary of the state rules gives a fence at least 1.2 m high, a 900 mm non-climbable zone on the outside and boundary fences of at least 1.8 m where they form part of the barrier⁹. The same summary limits gaps to no more than 100 mm⁹. Western Australia requires a barrier built to AS 1926.1-2012 around any pool able to contain water more than 300 mm deep, with inspections at most four years apart⁸.

The trap is a deck that sits outside the fence and rises towards it. Queensland's rules list deck ledges among the climbable objects that have to be at least 900 mm from the outside of the fence⁷. Where a fence of 1800 mm relies on a non-climbable zone inside instead, the rules want the full height on the inside too, and they give a deck as an example of something at the bottom that would reduce it⁷. I'd set the deck level and the fence line out together before anything is built.

Inside the fence the deck is part of the pool area. If a glass fence stands on the deck, I'd fix its posts to the frame. One maker's FAQ says balustrade and pergola posts mustn't be fixed on or through the decking boards, only to the sub-frame with the boards cut around them¹, and I'd treat fence posts the same way. That's a frame detail to draw before the joists go in, not a fence installer's problem afterwards.

Before you order

Leave samples in the sun on the coping, then pick the lightest colour you can live with. Ask the maker for the wet pendulum class of that board and colour. Specify stainless clips and 316 screws, with a frame coating matched to salt or chlorine. Draw the fence line, the non-climbable zone and the deck level on the same plan, and show it to your pool inspector before you build. If the block is also bushfire-prone, read the guide on fire ratings and BAL zones, because a pool deck on a bush block has to satisfy both sets of rules. If you're still choosing the material, the PVC vs composite guide explains where PVC justifies its higher tier around pools. The deck designer will give you a concept plan and a materials list to take to your builder.