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Ceramic Tile Installation over 2 different substrates

Posted by markdb77 (My Page) on
Sun, Jan 16, 11 at 18:36

The area that I am going to install the 16"x16" ceramic tile consists of a kitchen with wood subfloor and adjacent room with concrete slab.

I have ripped out the plywood in the kitchen, so only the 2x8 planks remain. As it is now, the wood planks are about 3/4" below the height of the slab in the back room.

My plan, until now, has been to glue and screw 1/2" wonderboard to the planks, then feather out the remaining 1/4" difference between the 2 different floor heigths with floor leveler. Then lay tile directly to the slab and wonderboard with thin set.

After doing some research, it seems that I should be considering an expansion joint between the 2 different subfloors and also install plywood on top of the wood planks, then install the wonderboard on top of that.

Any suggestions are greatly appreciated.


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RE: Ceramic Tile Installation over 2 different substrates

By 2x8 planks do you mean 1x8 subfloor or 2x8 floor joists? If you are 3/4 inch below slab I believe I would but 3/4 inch t&g OSB on wood floor and then float 1/2 inch Hardi board over entire area making sure to straddle wood to slab joint with the Hardi. Get that joint very flat as 16x16 tile are very unforgiving


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