Didn't realize how much a liner actually moves in the heat

Started by Jason Okafor · · 2 replies
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#1
Random thing I noticed this week, was out there brushing around 2pm and the wall in the deep end had these little waves in the vinyl that weren't there in the morning. Freaked me out for about a second thinking it was pulling loose. Buddy who does pools for a living said it's totally normal, liner expands in the heat and settles back down once it cools off at night, mine's a 2015 install so it's not exactly new either.

Still checked the whole thing top to bottom with a flashlight just to be safe since I've patched a tear before and don't want a repeat. Nothing wrong, just vinyl doing vinyl things apparently. Anybody else notice this or is my liner just being dramatic in this heat.

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#2
Cant help with liner stuff since ours is fiberglass, but I had a similar heart attack moment when the steps looked like they shifted a little in the afternoon sun and it turned out to just be the gelcoat flexing, nothing actually wrong. Good on you for checking with the flashlight though, thats the kind of thing that saves you a bigger headache later.
#3
mine's inground with a liner too and ngl i wouldnt just chalk up any waviness to heat without the flashlight check like you did, good call there. but the "settles back down at night" thing, i'd keep an eye on whether its the exact same spot every time or if it moves around. mine gets a little loose looking near the deep end steps in full sun and it always flattens back out by morning, been doing that for two summers now with zero actual problems. if yours is doing the same spot every single afternoon and going away every night for weeks that's probably just vinyl breathing like your buddy said, but if you ever notice it NOT go away by morning thats when id worry it's actually pulling from behind. phoenix heat probably makes this way more dramatic looking than most climates tbh