Overlapping liner seems to slip over time

[trixx209]

We had an overlapping liner put in this summer . Everything seemed fine . The pool was filled all summer then I noticed the overlap getting less on one side . The entire pool might avg 4” overlap ( not a lot but it was the only overlapping pool liner pool supplies sold for a 27’ 54” wall) when I seen it in July it might have had 2” over hang ( under the top rail ) and now in novemeber its probably down to 1” what could be causing my liner to slip when it was full of water for months . It’s brand new liner

 

[kimkats]

Hi and welcome to TFP. Sorry to be meeting this way.

Was the liner touching the sides of the wall all the way down when the water was added? Do you have a sand or foam cove?

 

[trixx209]

Hmmm I’m not sure I know the liner was touching the sand cove . I had a guy instal it so i assume he was paying attention . I think it was installed in June I just assumed any settling would have already been done when it was full . I know I drained it 18” below skimmer for winter since we get a lot of rain and snow here I noticed the liner towards the top I can push in towards the wall if that matters. The guy who installed it did use a shop vac

 

[phonedave]

Liners shrink when sitting out in the sun / open air. Are you sure it is not just the overlapped part shrinking?

It would take a LOT to pull a liner over the top of the wall with the overlap clips on. It would tear first.

 

[InyoRich]

Is the floor of the pool relatively flat or dished (deeper in the middle)?

 

[trixx209]

It was just 2” deeper in the centre . And I’m not 100% I thought the same as you as it should rip before pulling in . But the only reason I noticed it was I could see the design in the water was lower than the rest in that one spot . It’s been full for about 6 months doesn’t make any sense to me what’s going on with it