Plywood over plank subfloor


Old 08-22-15, 08:01 PM
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Plywood over plank subfloor

I'm new to the forums and remodeling my kitchen. We are going to lay tile and I've been looking through the forum about plywood thickness over plank subfloor. There is 3/4" ply over the plank subfloor and planning on using 1/4" backer board. I'm concern about the height of the floor with the thin set, backer board, and tile. What would be my options to save on the height of the floor.
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Old 08-22-15, 09:29 PM
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If the joists system is stiff enough for tiles your subfloor should be thick enough for the tile backer or a tile membrane such as Ditra.

" CBU will be at least 5/16" once installed into the thinset. If you wanna save some height and step up to a better method, I recommend Ditra which is ⅛" total installed.

Now tell us about the framing, the joists. Size, spacing and unsupported span. Be accurate. If possible see if you can figure out their species and grade too. Age of the house and condition of the joists may help. Pics are always good.


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