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Radiant - Gypcreet

KCA_2 Member Posts: 308

  What are you guys using for insulation when you have a Radiant staple down and Gypcreet over.   I can't put any insulation in the joist cavity below & I feel like I need some...  Have you been using a Bubble wrap / reflective insulation and staple to it?

   Thanks for your help

  :-)  Ken
:-) Ken


  • SWEI
    SWEI Member Posts: 7,356
    Joist cavity below

    Why not?
  • Zman
    Zman Member Posts: 7,550
    Warm Board


    I am guessing you have finished ceiling below. Can you blow in insulation?

    First off  bubble wrap will not work in a radiant system. The "reflective" value only works in an air space. Even then it is suspect and not allowed by most codes. The other thing to look at is the compressive rating. If the product will compress under load, the gyp will crack. If you can afford the space rigid insulation would work.

    Why are you looking for a high mass system? I would take a hard look at a product like warm board. You can put rigid insulation under it and eliminate the thermal "flywheel effect"

    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Gordy
    Gordy Member Posts: 9,546


    If headroom is an issue fan fold before bubble wrap. R1 is 100% better than r0. Or bubble wrap.
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