Radiant floor heat: Insulation for first floor and basement
We are installing hydronic radiant heat in our (to-be) finished basement subfloor and the first floor above the basement. I have a few questions on best practice for insulation.
1) My plumber says that staple up radiant tubing is fine and we don’t need the heat transfer plates – Is that true or should I insist on them?
2) What is the best way to insulate below staple up radiant heat if there is finished space below it (but space not used nearly as frequently as the main floor)? Another consideration is that the insulation can ideally provide soundproofing simultaneously.
3) We have 4″ of rigid foam planned above stone before we install the radiant and pour the slab. Do I need a plastic vapor barrier above or below the rigid also? If so, how do I deal with rain if that happens during the process? Lastly, do I need to insulate the side of the slab (where it meets the walls) too somehow? We are planning to spray foam the interior slab walls.
Thanks so much for your advice in advance!
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