Adhering cement backerboard to gypsum substrate


Old 12-27-08, 01:17 PM
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Adhering cement backerboard to gypsum substrate

I'm preparing to install 12x12 ceramic tile to our 3.5 x ft 8 entryway. We live in a 2nd floor condo, and the subfloor is a gypsum-based substrate (gypcrete?) which used to have vinyl over it. I removed the vinyl but a lot of adhesive remains; I can't remove much more without destroying the substrate. No high peaks though.

I plan to put down Durock cement backerboard, then the tiles.

The mortar I purchased for adhering the tiles to the backerboard is "TEC Invision Ready to Use White Universal Adhesive" (for tile and stone, floors and walls). It exceeds ANSI A136.1 type I & II (whatever that means) and does not require any mixing (e.g., with water).

Can I use this same adhesive to adhere the Durock to the gypsum-based subfloor? (I will also be using Durock screws.) According to the instructions, relevant suitable substrates include: "Cementitious backer units ... cured portland cement plaster ... [and] well-cured dry concrete."

Will this adhesive work or should I purchase something else?

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Old 12-27-08, 02:12 PM
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You don't want to use backer board on gypcrete. See this web site for instructions on laying your tile - Finished Floor Support. You may want to call them for some advice also - good luck with your project....

Gyp-CreteŽ Flooring Underlayment - Maxxon
Old 12-27-08, 02:41 PM
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Use a different underlayment, like Schluter Ditra or a Noble product. No cement board.

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