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Radiant Heat Install Under Hardwoods w/o Subfloor
Hello all, I am working on installation of a radiant floor heating system in my two story 1940's colonial to replace a failed one pipe steam system. After demoing the ceiling and exposing the underside of the second floor joist space I found that the second floor doesn't have any subfloor. The flooring consists of the oak tongue and groove flooring nailed direct to the joists.
My plan was to staple the PEX and transfer plates to the subfloor but not I am not sure this is the best idea for my second floor situation by stapling direct to the underside of the hardwoods. I considered attaching furring strips to the side of the joists and then stapling the transfer plates to the furring strips. Of course this would create a small air gap between the transfer plate/PEX and the flooring.
My first floor flooring has a tongue and groove sub floor under the oak flooring. So that floor shouldn't be an issue for the install. Thanks in advance for any recommendations and wisdom you can provide.