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Radiant question

I am currently building a 24 x 36 garage, and want to heat the slab radiantly. I have minimal radiant experience. My contractor designed the grades using an insul-tarp with half inch tubing zip-tied to the wire mesh. My supplier suggested "Crete-Heat" panels with a 2&1/8 thickness for added R-value. Is it worth the extra money for the panels & labor to remove the stone to make grade? Is there any benefit to doubling up the insul-tarp? The tarp has an R-value of 2 compared to the panels with R-10.

Thanks for your thoughts!



  • NRT_Rob
    NRT_Rob Member Posts: 1,013

    for all intents and purposes, insultarp is not insulation.

    some real rigid foam product should be used. Insultarp, while better than nothing, is not much better.

    we like crete heat and I would not hesitate to recommend it, but as long as it's actually rigid foam and not some reflective hocus pocus, and it's about 2" in thickness, I'm usually satisfied.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
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