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I'll be replacing a liner in a season or two and have been thinking of this. I have about a 1/2 -3/4 dip in one area of my pool--opposite side from the skimmer/return. I've read about sand & foam as a bottom layer...does the foam layer help with the issue. Instincts tell me yes.
Do *NOT* put foam under a liner. Doing so will result in a puncture, the first time something hard presses against the bottom!
(Your question is a bit OT for this thread, so I'm moving it to a separate thread.)
After I saw that Ben posted his response above, I asked him about it. I have always had foam under any liners I have had and have never had a problem. He told me to go ahead and post that I have done so multiple times with nary an issue.
I also have foam under my liner. 1/4" closed cell foam and on the wallsas well. The walls are soft to the touch, the foam on the floor has compressed and doesn't give underfoot.
Seriously PD and WM. 11 & 9K posts ?!?!...that's a lot of help and wisdom given. I'm in a PC gaming forum elsewhere on the web and I thought I was hot stuff with almost 5,000 posts dating to 2005.
Anyways. I would imagine the kind of foam used would matter and I'm pleased to hear you two say you've had an okay experience. My pool has the original liner from like 15 years ago and there are quite a few divots and slight irregularities that make me think an underlayer of foam might help mitigate and prevent. Yes--closed cell foam, like the kind used in those yoga mats.
Additionally...draining the pool, fitting the liner and refilling seems like a pretty big job. I can see how if done wrong you may jeopardize the AG installation as a whole. It makes me think that maybe I should replace the liner only when it's physically required instead of when it is aesthetically pleasing. I mean, yes, the liner is faded, and its got some mineral stains here and there, but it's functioning perfectly.
Beyond an obvious leak, do you see anything else as an obvious tipping point for putting in a new liner? Curios to know..
If it works, it works.
Putting foam under a liner seems like a bad idea to me, but if it's not causing problems, then it's not causing problems.
Our maxim has always been, don't fix what's not broken.
I stand corrected.
PS. PoolForum started in 2000, PoolSolutions in 1996. That truly makes me an Internet fossil!