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Discuss Failure! in the DIY Tiling Forum area at TilersForums.com.
They obvious way is to leave the uplifted floor uncovered for a few days and see if it dries out, if it continues to look damp then you have your answer, at which point you should contact your home insurance or alternatively if you like I can give you details of a local company that will come out and exactly pinpoint your leak, but they aren't cheap to pay although it wouldn't be dramatic.Is there any *easy way to tell
If I have a leak below the subfloor?
What should my next move be?
I agree with this as most likely cause for failureOnce the grout goes it won't take may wet washes to get too much water under the tiles.
Reply to Failure! in the DIY Tiling Forum area at TilersForums.com