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Question DetailsAsked on 10/28/2017

Can I lay carpet over a floating floor? Whole house has this except kitchen and bathroom.

I have square wood tiles throughout my house that snap together on top of a concrete slab. Can I put carpet over them? These tiles are not glued or nailed down. This house was built in the late 50s. I took out the nasty carpet and found the wood tiles. I am being told I have to remove them so the new carpet can be NAILED down. What? Nail it into the concrete rather than tack it onto the wood tiles like the old carpet was?

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No reason a carpet can't go over pretty much ANY other type of flooring - other than over carpet, of course - though I have seen carpet successfully overlaid over old carpet (as long as it did not have holes worn in it) - is sometimes done on quickk commercial remodel jobs that need to be done overnight or over a weekend, putting a new carpet over a short-pile commercial carpet.

The only concerns I would have would be to use longer concrete nails to fasten down the tack strip around the edge (which is what holds the carpet edges in place and the carpet stretched tight) because they have to pass through the underlying flooring before they hit the concrete. Fastening the tack strip into only the snap flooring - I don't know I would trust that, because it might tend to buckle under carpet stretching forces.

And secondly, because the snap wood tiles are over bare concrete, not having said anything about a vapor barrier under the tiles, is you may be getting moisture from the concrete (which can potentially reach gallons per day over a household area) which the current flooring is evidently handling OK (if it exits), if you trap that moisture then you could have mold issues at the tile/carpet interface. Therefore, I would recommend (as with any slab-on-ground situation) that the carpet padding be highly moisture and airflow permeable (open-weave) and have no natural fibers, and that the carpet also be made wholly or at leat mostly of synthetic materials with no wool or cotton or such fibers opr warp (because they tend to mold/rot easier than synthetics) and be quiteopen-weave and permeable - open grid backing, and open wear surface weave like an open-tuft pile carpet rather than at tightly woven persian or berber.

I am not certain wny (other than maybe transition height issues between rooms) you do not take up the old flooring, however - snap tile flooring comes up REALLY easy unless it has been glued down (which you say yours is not), but I see no technical reason to do so other than the multi-layer trapping of moisture potential, assuming it has not been "slapping" when walked on - which probably means it has an underlayment or back-adhered padding under it.

Answered 2 years ago by LCD

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