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Question:

can you use cement board as a subfloor?

I am planning on replacing my current bathroom floor with 3/4 plywood. I want to use 1/4 cement board as my sub-floor. However, I am not sure if peel and stick flooring will work with cement board. Please help.

Answer:

No, it will not with any consistency. What you need to use is 3/8 partical board over your 3/4 plywood. You can find partical board in 1/4 but it is expensive and hard to find. This is typically used as a substrate material for all lino/vinyl tiles. As long as the partical board is clean and free of loose dirt, the self-stick tiles will work fine.
I'm not sure if peel and stick adheres to cement board. Check the packaging. Why not just laminate 1/4 inch ply to the 3/4 if you need the inch.
First of all, you sub-floor is the 3/4 plywood. Anything over that is overlayment. What goes over that is the flooring. I agree with the 1/4 luan. What I don't agree with is why in the world would anyone use peel and stick flooring.
No you do not want to use 1/4 cement board for this. 1/4 luan is a much better substrate for any vinyl product you install. Please reconsider the peal and stick, sheet vinyl is much better and longer lasting in a bathroom area.. Any questions you can e mail me through my avatar. GL
no and you need 1/4 luan or underlayment do not use particle board will not stick for any extended period of time

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