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Laying tile with a wood substrate???

Hey guys, just wanted to say thanks in advance, and for all the help you guys have provided to me over the years in previous posts!

Anyway, just bought a new house in Texas. It's a "stick-built" home, which is different than I'm used to. In South Florida, our homes are solid concrete.

So I have this bathroom on the second floor, and the floor is wood sheething, basically plywood over framing. I want to lay tile in this bathroom which currently has lenolium (sp?) on it. In my other house, it was no big deal, thinset on top of concrete and lay the tile. But here, I'm not sure I'm supposed to lay tile directly on the plywood. Is there something I'm supposed to put down first? What prevents the floor from flexing? I'm planning on going with larger tiles... 12"x24", but again, worried about cracking and movement. Is there some kind of harder wood that I can put down? Thankfully, the area isn't that big... 13 feet by 4 feet, and then another small area that is 6 feet by 4 feet.

Anyway... really appreciate any advice! Thank you!


Re: Laying tile with a wood substrate???

Install cement board such as Durock. http://www.homedepot.com/p/DUROCK-Next-Gen-1-2-in-x-3-ft-x-5-ft-Cement-Board-172965/202263276
Follow installation instructions.


Re: Laying tile with a wood substrate???

There is a web page that can help you check if the floor is strong enough. It asked the length of the joist. the spacing and how thick is the plywood on top. the name of this page escapes me now , it was all about tilling . It is very important to check this out. failure to install a strong enough underfloor will result in broken tile and or grout.

Re: Laying tile with a wood substrate???

FIRST screw down the subfloor, remove all the squeaks, make sure its solid. Any rotted sub-floor should be replaced. Start with a good solid surface. Screws every 8" everywhere.
Use the construction adhesive, glue the cement board down, then screw it down using the cement floor screws, normally placed about 6-8 inches in the field, maybe less on the edges
Tape and mud the joints using the mesh tape made for cement floors
Check for level, you want the floor perfectly level. If its out of level, use self leveling mud, mixes very thin then block off heater vent with styrofoam and door etc.. pours and screet out just a bit, it should self level
Let it dry for a couple days
Then you are ready to tile, check for square, snap your lines, make sure you have the boarders/edges figured out,
If done correctly you should have zero cuts that aren't out of square, the edges of the room might have a little gap that you could cover with baseboard tile, if it doesn't cover then cut tile to match.

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