Insulating a radiant heated floor (below slab) -- use foam board?
Quick question to all the radiant floor (basement concrete) experts out there.
I'm in the process of having our basement floor broken up, dropped down a foot and re-poured with a PEX in-floor heating system installed (in-floor).
Concerning the insulation *beneath* the PEX, our contractor has quoted us to use a "Reflector Pad" beneath the PEX. I'm concerned this may not be enough and am considering laying down 1" or 2" high-density rigid foam board over top of the gravel BENEATH the concrete altogether.
Can someone illustrate whether my approach is overkill? Would adding a rigid foam barrier between the gravel and concrete be necessary if a reflector pad is already in the plan to be installed beneath the PEX?
I've got one shot at having the floor built properly, and I want to be certain we're doing it right the first time.
Go with the foam.
Go with the foam but, make sure the gravel is compacted flat so you don't develope stress cracks in the new floor if it's supported unevenly.
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