When we bought my house 6 month ago we installed floor at the same time. It was fine for the first 3 months but after that one area in the 1st floor wood start rise. Whenever i walk around it, it sunks an inch as if there is air bubble there. I talked to the contractor who installed it and they did moisture reading and it was around 6~8% around the spot where the floor is lifted up a little bit. There is bathroom right next to the area so we did reading there too and this time one wall had reading of about 12%. I hired a plumber to take out the toilet and see if there is any leak. The plumber didn't want to take out toilet first and instead we went to the crawl space and there was no sign of water leak. We looked behind insulation.

My floor contractor want us to hire plumber again and actually take out toilet because there can be very small leak like a few drops of water every hour that can somehow damage floor.

Should i hire plumber again? Is there another way to find out where the problem is?

The floor was installed in the summer (July) and the floor started lifting in October. Humidity is usually higher in the summer and lower in the winter so i am not sure why this is happening.

We didn't spill any water on the floor and there is no water leak as far as we know.

  • please edit your post so we can understand what is going on. – DMoore Feb 18 '15 at 4:53
  • And you all thought it was going to apes or zombies! I for one welcome our new wood floor overlords. (Couldn't resist the memestolgia) – OrganicLawnDIY Feb 19 '15 at 3:51
  • @Dmoore, can you point what which part doesn't make sense? – user21479 Feb 19 '15 at 6:18

Well since you found some traces of pipe leaking you MUST call plumber urgently. It is a different question should you pay for him or contractor should; that depends on your contract and his work scope. Now when you are speaking about moisture reading there are several ways of measuring it. My guess is that he has used a device which has something like two wires on the top which he places on the surface and then he reads moisture percentage. This method is not particularly accurate, since it only measures surface moisture (which can be both higher and lower than inside moisture which is really important) and also humidity can vary up to few per cents on the distance of 20-30cm.Any way, fix those pipes, and after that if possible you should do dry testing.

  • my bad i meant there is no sign of leak. i mistyped no to "on". i guess i will have to hire plumber to make sure – user21479 Feb 19 '15 at 3:20
  • When you put the wooden floor did you also put the new cement screed? If you have this could be the reason, because it is possible that the screed wasn't dry enough at the time they have installed the floor. Anyway keep us posted so we can try to get to the bottom of this. – python starter Feb 19 '15 at 9:47

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