Can unfaced polyiso be used for radiant heat systems?
I have radiant tubing installed between floor joists. I’ve placed a foil reflective sheet beneath the tubing and though faced fiberglass insulation is recommended to be placed beneath the foil sheet, I want to use un-faced polyiso boards 3″ thick instead. The boards will be exposed to a heated, block wall, basement that is reasonably dry.
I would appreciate your comments.
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