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cdc3jj 07-27-2010 12:23 AM

Need some tile advice... Total noobie here
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So my wife and I have dove headlong into fixing up our tiny townhouse. Long story short, we are ready to prep and lay our tile floors in the bathrooms.

We have a half bath downstairs and a full bath with an old shower/bath combo upstairs. Only about 30 sq/ft in each one. The subfloor is 3/4" press board with a 3/8" layer of plywood.

Floor seems soild downstairs, but upstairs it creeks a little so I know there's some flex there. I'm planning on shotting some screws into the joists to remedy the creeking.

I'm concerned about the height of the subfloor. We are planning to do hardwood floors in the living room and I want to avoid having a little step up into the bathroom from putting down the concete layment. Do I even need that stuff? I've read on some sites I do and some sites I don't. Wonderboard I think it's called.

Another concern is that I have a small gap between the sub floor and the drywall. Is it better to get the tile to slide under there or just lay it to the edge and put down some base board?

Thanks for any advice. I'm pretty new to this kind of thing. My dad is a master at most things construction but has never done tile (always linoleum) so I'm a little in the dark on this one.

Donnie L. 07-27-2010 12:51 AM

I'm no expert, but from what I understand, you absolutely need that stuff in any areas where there's running water in the vicinity. Cement board is not completely water proof, but I've always seal the joints with nylon tape and thinset and have never had a problem.

There's probably various membranes you could use that are <1/4" in tickness, which would reduce the "little step" you're concerned with, but I don't know too much about it. Lots of luck.

FlooringDude 07-27-2010 08:47 AM

Tear out the 1/4" plywood and then proceed installing tile using either backerboard or ditra if height is an issue. If you already know the tile you are using test it by installing one near the door with backerboard and everything. If you need it to be lower use ditra. If the hardwood is higher plane it from underneath in that area.

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