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Old 06-20-2010, 10:24 PM   #1
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best subfloor and insulation for radiant floor


i just bought a house with a 850 square foot concrete block unfinished addition. there is a 3 foot crawl space with floor joists already in, and just earth underneath. i'd like to put in hydronic radiant floor heat in concrete slab above the joists, and i'm not sure of the best way to insulate underneath the joists. is a 3/4" subfloor with fiberglass insulation between the joists the best for this situation? i'm a little concerned about the concrete block and moisture coming in. right now there is no insulation anywhere, and no vapor barrier... the addition was built 50 years ago and has been untouched.

thanks for your input,
nicole

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concrete block, crawl space insulation, insulation, radiant, radiant floor heating


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