Thermal break for new radiant slab?
We are retrofitting a slab on grade portion of our home that has an existing 4" thick concrete slab with a thinnish layer of insulation underneath. We are going to install radiant heating over top of this existing slab. There's an existing fireplace in the room and the hearth is 3 inches above the existing slab.
So to keep the new radiant overall thickness to roughly 2 1/2 inches to allow for 1/2 inch for wood flooring I was going to install 1/4 inch thick extruded poly (Owens Corning fanfold) then Hilti wire mesh, then 5/8 tubing, then gypcrete.
My concern is whether I can use the fanfold material in contact with the radiant gypcrete slab. Thoughts?
Posted Aug 26, 2014 10:27 AM ET
Edited Aug 26, 2014 1:43 PM ET
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