Installing radiant hot water below floor.

Old 02-08-21, 08:05 PM
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Location: USA
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Installing radiant hot water below floor.

I am installing POLYPRO INSULATION BOARD (HAS METALLIC REFLECT BARRIER ON ONE SIDE, R-VALUE OF 3.85 for 1 in or about for 2 in .. OR KINGSPAN INSULATION BOARD. WITH NO REFLECTIVE BARRIER WITH R-VALUE of 5 for 1 in or 10 for two in. Which would be better? I am thinking of install fiberglass insulation of r-12 under the board with foil up toward the kitchen above..
Old 02-09-21, 08:11 AM
Join Date: Jan 2014
Location: USA near Boston, MA
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For a kitchen/dining room floor above I just used 1 inch Poly Shield board in a well sealed basement. In another area I just used 8 inch Fiberglas with kraft face down. Both work fine. Poly Shield is fire resistant and can be left exposed.

This is work in progress. Ends were covered and sealed later.

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