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  1. 04-22-2012, 05:54 AM #1
    aechamps
    aechamps is offline Regular Contributor
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    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.
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  2. 04-22-2012, 04:12 PM #2
    DrewHH
    DrewHH is offline Regular Contributor
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    Default Re: Lightweight concrete over Radiant

    Gypcrete sub usually primes the floor before pouring. Cannot remember what they used.
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  3. 04-22-2012, 07:30 PM #3
    Dancing Dan
    Dancing Dan is offline Veteran Contributor
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    Default Re: Lightweight concrete over Radiant

    We've just done it right over the Advantech.
    "anxiety tempered by hopelessness."
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  4. 04-22-2012, 07:31 PM #4
    tjbnwi
    tjbnwi is offline Veteran Contributor
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    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.
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  5. 04-23-2012, 05:27 AM #5
    aechamps
    aechamps is offline Regular Contributor
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    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.
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  6. 04-23-2012, 05:33 PM #6
    RocketScott
    RocketScott is offline New Member
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    Default Re: Lightweight concrete over Radiant

    Advantech says to prime to promote adhesion:

    http://www.advantechperforms.com/tec...5-6d2ba1b3b7ab
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  7. 04-23-2012, 05:44 PM #7
    aechamps
    aechamps is offline Regular Contributor
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    Default Re: Lightweight concrete over Radiant

    RockettScott that was great info. thank you
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  8. 04-25-2012, 10:24 PM #8
    bluemoose
    bluemoose is offline Veteran Contributor
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    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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