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  1. #1
    Join Date
    Nov 2008
    Posts
    40

    Default Lightweight concrete over Radiant

    Pouring 1 1/2 inch lightweight concrete over radiant and advantech subfloor on an interior application. Do you have to prep the subfloor with anything like k 88 or just pour directly over a clean subfloor? Any tips would be appreciated.
    Last edited by aechamps; 04-22-2012 at 05:56 AM.

  2. #2
    Join Date
    Sep 2006
    Location
    Philadelphia, PA
    Posts
    66

    Default Re: Lightweight concrete over Radiant

    Gypcrete sub usually primes the floor before pouring. Cannot remember what they used.

  3. #3
    Join Date
    Jun 2004
    Location
    Portland, ME
    Posts
    6,297

    Default Re: Lightweight concrete over Radiant

    We've just done it right over the Advantech.

  4. #4
    Join Date
    Feb 2008
    Location
    Northwest Indiana
    Posts
    5,576

    Default Re: Lightweight concrete over Radiant

    Prime, check to see if the light weight requires lath over plywood.

    Tom
    http://chicagocraftsmen.org/2011/06/261.html

    Check with the AHJ, what we say doesn't matter.

  5. #5
    Join Date
    Nov 2008
    Posts
    40

    Default Re: Lightweight concrete over Radiant

    Prime with k 88 or acrylic 60 product? Is it to adhere the concrete to the plywood? Subs use fiber mesh in the concrete here in the northeast.

  6. #6
    Join Date
    Sep 2009
    Location
    Tacoma, WA
    Posts
    36

    Default Re: Lightweight concrete over Radiant

    Advantech says to prime to promote adhesion:

    http://www.advantechperforms.com/tec...5-6d2ba1b3b7ab

  7. #7
    Join Date
    Nov 2008
    Posts
    40

    Default Re: Lightweight concrete over Radiant

    RockettScott that was great info. thank you

  8. #8
    Join Date
    Feb 2005
    Location
    Pine, CO
    Posts
    268

    Default Re: Lightweight concrete over Radiant

    Maybe a little late, but you'll definitely want to prime at a minimum. When we do lightweight over Advantech, we also staple lathe down...cheap insurance against a possible nightmare scenario (if the bond between the lightweight and the Advantech were to break).

    Adam

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