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Unread 05-10-2011, 11:39 AM   #1
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Redgard over plywood

Hello list,

In reading the posts, it seems that nobody likes installing ceramic tile over plywood. I have not seen anyone explain why. I was wondering because I have a floor that had carpet on it. The deflecto is 857 and has 1X8 boards diagonally across the joists with 3/4 inch CDX plywood on top of that. Since the floor seems to be free from squeeks and solid, is it still suggested that I put down CBU on top.

Would it be advantagous to put Redgard down instead of CBU to eliminate fracturing? I have Redgard left over from a previous project.
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Unread 05-10-2011, 11:51 AM   #2
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Your first problem is going to be that CDX you have there. Not good for tile at all. Read the library section on plywood for tiling.

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Unread 05-10-2011, 12:55 PM   #3
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Yea, the cdx is not so good. I wouldn't bother with the Redgard either.

Replace the cdx and then either install 1/4" cbu over it or an uncoupling membrane like Ditra.
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Unread 05-10-2011, 01:47 PM   #4
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Redgard can be used as an antifracture membrane over a properly prepared plywood subfloor. I take that to mean any plywood subfloor that meets the installation method (F142, F143, F150, etc) for tiling directly on a plywood subfloor according to the TCNA (Tile Council of North America). Your floor wouldn't, even if you had the correct plywood. None of the methods in teh tile handbook start with a plank subfloor, although I suppose the 3/4" plywood would make that a debateable issue.
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