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in floor radiant questions

IZZY Member Posts: 52
Just had an addition built over my garage (just the shell), will be a bedroom and bathroom. I am planning to put in above the floor radiant, but I want to use panels, not mud, and have a few questions.

- The builder told me to put rosin paper between the layers of subfloor / underlayment.  I read somewhere a while back that the rosin paper can let off a smell when the floor is heated.  Any truth to that, do I need anything between layers?

- I'm planning to use heat transfer plates.  I see a lot of products' literature says you can lay carpet right over this, but I figure that I'll feel this thru the padding so I want to either smooth over the pex with some kind of mud or put a layer of maybe 1/4" plywood on top to smooth the floor out.  Any thoughts?



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