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Lightweight concrete over Radiant

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  • 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, 06:56 AM.

  • #2
    Re: Lightweight concrete over Radiant

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

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    • #3
      Re: Lightweight concrete over Radiant

      We've just done it right over the Advantech.

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      • #4
        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
          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
            Re: Lightweight concrete over Radiant

            Advantech says to prime to promote adhesion:

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

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            • #7
              Re: Lightweight concrete over Radiant

              RockettScott that was great info. thank you

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              • #8
                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
                www.bluedivideinc.com

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