Upgrading fiberglass batt insulation under radiant floor heating?
I have an unfinished basement with fiberglass batts on the ceiling that my customer doesn’t like—due the dustiness and un-kept look— and there are some rodents in the fiberglass. The batts cover pex radiant heat (tubes against the bottom of the subfloor) in a 2 x 10 assembly. I’m reading so far on this site that removing the fiberglass and installing a reflective bubble wrap type radiant barrier under the pex isn’t effective since the usefulness of the radiant barrier in this situation is small and the bubble wrap is a trivial conductive insulator.
So….dry wall or polyiso fire-rated foam board over the bottom of the floor joists would be an expensive option.
What about stapling Typar or a house wrap material up against the batts? Polyethylene was not recommended in one post by Martin — I assume because it traps moisture.
Any other lower cost recommendations?
Rodents to be controlled by exclusion and trapping. Will replace fiberglass batts as necessary if they are retained as the insulating material under the radiant floor.
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