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Old 04-13-2013, 01:59 PM   #1
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subfloor clarification


Hello All,

I'm in the midst of installing a new tile (marble mosaic) floor in my '50s era bathroom. I've removed the vinyl flooring and the 3/8" plywood (luan i think). What I'm left with is the 3/4" x 5 1/2" boards, which are nailed to the joists. My question is this... Do I need to install another layer of plywood over the planks as well as a layer of cement board before tiling or can I just go for the cement board over the planks? I'm inclined to think that I need both layers, but I'm afraid the two layers plus the tile will be way higher than the finished floor height of the adjoining hallway. Any advice is much appreciated. I think I've included all the details, but please feel free to ask any questions. I'm including a picture for reference. Thanks in advance.
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Old 04-13-2013, 02:03 PM   #2
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subfloor clarification


Need the less height then get rid of the old subfloor, it's not doing you any favors.
Just use a Toe Kick saw to cut right up to the walls.
If you just go over it or remove it use 3/4" T & G Advantec subflooring then 1/4 tile board set in a bed of thin set.

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Old 04-14-2013, 10:25 AM   #3
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subfloor clarification


I'd opt for Ditra instead of the concrete board. Just one more layer of security considering what is under it all. It might get you just a bit less height boost too, though not much.
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