In joist heating efficiency different substrates

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by thompsonblake, Oct 22, 2012.

  1. thompsonblake

    thompsonblake New Member

    Messages:
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    Location:
    Nova Scotia
    Hey guys plumbing apprentice here, putting in joist radiant in my main level about 1000 sqf. About 40% of the flooring is ceramic tile and 60% hardwood. I know hardwood isn't ideal for efficiency, but id prefer to have it everywhere than have a combo of baseboard and radiant.

    Now for the big question, underneath that hardwood is a thin layer of asbestos (the paper sheet style). Will this layer kill my heat transfer from the in-joist below? I know it will have a negative factor but i cant seem to find the r value or equivalent rating? The only thing working in my favor is the the subfloor is 1x6 rough cut planks spaced about 1"

    Anybody have experience with this matter?
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