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Question DetailsAsked on 1/22/2014

whom to call to find pipe layout for house

Put down hardwood floor on cement slab and it's cupping in a area in the bedroom. Need to find the source of moisture.

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Voted Best Answer

Was a moisture test performed before the flooring was installed? If not there is a possibility of ground moisture seeping through the concrete foundation. It might happen immediately or can come with seasonal/weather changes. Also, if it was glued down were the manufacturer's instructions for the adhesive followed. Some adhesives must gas for about 15-20 minutes before the flooring is installed. Otherwise, they put off gases that will push the floor back up. This problem is generally seen within a day or two of installation.

If you are sure the floor was installed properly call a plumber to run a camera and radio head through the pipes in that area to see if one is broken, if one is in that area at all. Remember that water travels to the easiest point it can find to show itself so a leak could be 10 or 20 feet away but not show up until it reaches a point it can pool and maybe seep up through a crack in your foundation.

Answered 6 years ago by Todd's Home Services


IF you did not put down a vapor barrier under the flooring, that is your problem - ALL concrete slabs condense ground moisture underneath, which then diffuses into the lower humidity airspace above by vapor diffusion and wicking through the concrete, recondensing when it hits a relatively impervious surface like wood or laminate or vinyl/linoleum flooring.

Prior comment about tracing the pipes with a radio frequency probe is right - metal detector will not work for two reasons - some pipes might not be metal, and rebar/mesh inthe concrete will diffuse any signal from a surface detector. Sometimes - not always - you can get a pretty close signal response from an RF cable tracer hooked onto metal pipes - you hook the transmitter to the metal pipe (water or sewer) then walk around with the detector ot see where isgnal is strongest at floor level. It will be clear pretty soon if the rebar is carrying the signal too (like with a ground mat grounded electrical system or distribution box grounded to water pipe) because you will get strong response either in a rectangular grid all over the floor, or diffused response everywhere.

I doubt you will be able to anything about solving the problem without taking floor up and doing it right.

Answered 6 years ago by LCD

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