1 1/2 year old pool appears to be sinking

Niki FriedmanJanuary 2, 2011

We had a gunite pool installed in Oct of '09 (we live outside of DC in Northern VA).

In several areas, the concrete deck has separated from the flagstone coping and the coping is lower than the deck, in some places as much as 3".

Any ideas as to what's going on here? Is this normal in cold weather?

Thanks in advance!

Thank you for reporting this comment. Undo

Most likely the pool is not sinking but your deck could be heaving. If the subgrade was wet or not compacted properly then it can swell in cold weather and push your deck upwards. Since it is very unlikely that your pool would have settled un evenly check your water level on your tile. If it is level all around the pool then then deck moved.

    Bookmark   January 3, 2011 at 6:51AM
Thank you for reporting this comment. Undo
Niki Friedman

Thanks. Our pool is closed for the winter so we can't see any water. Even if we could, the water is well below the tile line.

    Bookmark   January 3, 2011 at 9:00AM
Thank you for reporting this comment. Undo
Niki Friedman

Thank you SO much poolcenter.com! My husband and I are nodding in agreement when reading your reply- we think you're spot on.

We have not caulked yet- we still have the foam-like strips between the concrete. At what point next year should this be done?

We've already noticed an improvement so hopefully things will even out.

Again- thanks so much! The picture on your blog is exactly what we've got going on here.

    Bookmark   January 4, 2011 at 8:42PM
Thank you for reporting this comment. Undo

After the Spring's main pollen drop. Some caulks take longer to skin over than others.


    Bookmark   January 4, 2011 at 9:34PM
Thank you for reporting this comment. Undo

Boy am I glad I read this. It's our first winter with our pool (we're in SE PA) and was out at XMas with the kids and noticed the deck was slightly higher than the coping...about an inch in one spot. Was too worried my pool was sinking. Frost heave makes sense though as we also just have that foam like stuff between the deck and coping. Hopefully in the spring it'll level itself back out or at least get close and then we'll caulk it before next winter.


    Bookmark   January 5, 2011 at 8:50PM
Thank you for reporting this comment. Undo

Teeter tottering is possible. Without pix, we won't know. We do know it's Winter and moist clay expands and when it freezes, gets even bigger.

Settlement near the dig would have caused it to sink near the coping, not rise. Your own pix show this.


    Bookmark   February 3, 2011 at 3:49PM
Thank you for reporting this comment. Undo

Settlement near the pool would cause it to sink near the pool, settlement away from the pool with relatively less or no settlement in between would cause it to rise at the edge of the pool.

To help ensure that it drops back to its original level if it is just frost heave, you can try putting 60 gallon trash cans full of water on the areas that are lifted the night before a day when temps are predicted to be above freezing.

    Bookmark   February 4, 2011 at 11:02AM
Sign Up to comment
More Discussions
Pool Filter Question
Should my pool filter run 24/7 or less than that? I...
Cleaning pool filter
Does your pool filter look like this after it's been...
Is it safe to build a vinyl inground with pyrite in the soil?
I have been trying to find information about excavating...
Concerns about quartzscape plaster on new build
Yea, our newly constructed pool was plastered with...
Regular Pool Cover or Automatic Cover?
Although our pool project is getting pricier every...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™