Damage to pool during liner replacement

Jun 5, 2014
17
Canada
We've owned this house with 18 x 36 foot vinyl inground pool for 6 years. The pool is around 25 years old I think.

It has worked great for us, other than some problems with liner bubbling / floating over the last 2 years, and a small leak at operating level, also starting around 2 years ago.

This year we booked with a reputable pool company to get the liner replaced, but have had massive issues:
  • They started work at the end of May, told us we needed ~$2000 of concrete repair work which seemed reasonable, I agreed to that. That took a few days.
  • Then they started installing the liner, but halfway through found they needed new stair strips. These they had to custom order which took 2 weeks (!).
  • Finally they got the parts and finished installing the liner on June 22. I asked them several times if they'd found the leak, but they said not to worry, they'd done a pressure test and all was good.
  • By the same afternoon we noticed some wrinkles / minor floating in spots. I checked the level that night and found it was losing about 3/8 inch in 12 hours (much worse than last year). By the next day (June 23) there were big bubbles and floating at the sides. I contacted the pool company immediately.
  • They sent a diver / tester specialist on June 25 and he said he found a leak in the threads of the deep end return. Apparently the pressure test could not test for this because of how that section gets plugged during the test.
  • They repaired the return on July 5, then did some additional repairs to the shallow end concrete and re-seated the liner on July 9.
  • However, on July 9 while the pool was filling and only half full (about a couple inches deep in the shallow end), we had a HUGE rainstorm, 6-7 inches in 16 hours. The liner started floating again, really badly.
  • Today, after they drained the water behind the liner, they noticed a bowing or bulging in a couple spots of the deep end wall, and also a big section on the deep end floor where sand/earth/debris appears to have washed into the pool (under the liner). I'm not sure how bad it is (they didn't give an estimate) but I'm guessing this kind of structural damage is going to be super expensive.
  • I am checking into home insurance coverage, but it doesn't look like it'll be covered

My question is, because this damage to the pool structure occurred while they were in the middle of the job, shouldn't the pool company bear some responsibility? If the pool was filled to proper level, I'm guessing the damage would not have occurred, or would have been much less. We've had large rainstorms in the past without any issues.

Thanks
 
Im not an expert at this at all, but one thing that stands out to me in your post, is that on July 9, the huge rainstorm caused the liner to float. Unless teh water level the pool was above any penetration through the liner, like the light, the returns, or skimmer, then it sounds to me like the ground is saturated and you have a "hydrostatic" issue.

Ground Water is making be liner float. I don't know about the geography in your area, but this is an issue in any area with high water tables, (Florida for example) and a good rain saturates the ground, and the water has no place to go,

This may also be the reason for the bulging and bowing of the deep end wall.
Ive really no idea what might be available to relieve the pressure, but those are my thoughts about it. Hopefully someone else with more knowledge about this sort of thing will chime in.
 
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Thanks for the replies. Attached is a pic of the liner floating (prior to them draining the water behind the liner), but you can't really see the bowing. I'll take a picture in the morning where you can see the bulges.

110823

@dave Yes my area definitely has a problem with clay / gumbo soil and high water tables.
 
Here is a picture showing the bulges in the wall -- a big one to the right of the light, and a smaller one to the left of it. It's hard to see in the water, but where the liner is sort of hilly, that isn't water or air behind it, but some kind of dirt/debris.

110841
 
Even though this post is a year old I thought I should explain what happened in case anyone finds it, they may learn from it.

It turned out the damage to the pool was caused by a broken underground sump line (running from house sump pump, not pool). Turns out the break in the line was RIGHT next to the deep end steel wall. During rainstorm the pressure in the line caused a lot of water to escape through the break and exert pressure on the pool structure.

Thankfully, because of the source of the damage (broken sump line) our home insurance covered most of the repair cost after paying out the maximum for the water damage rider. However, it cost us several months of pool use which has been very sad.

Now I'm just hoping the pool can operate for a nice long time without giving us too much trouble. Here's hoping!
 
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