Forum Title: How To Bridge Between Wood And Concrete Subfloors For Tile
I am remodeling a kitchen and removing the old tile. What I found was on top of the floor joists (18OC) was a 1x8 on diagonal with 3/4 inch hardwood floors on top of that. Now half of the kitchen floor is like that the other half is on a concrete slab with a crawl space underneath. My though was to rip out the hardwood floors and put in 3/4 inch plywood to come flush with the concrete slab then install Ditra over both the plywood and concrete before tiling the whole thing. Does that seem to be sufficient to cover the transition between the wood sub-floor and the concrete slab, preventing future cracking? Also the concrete has old black linoleum glue on it, does that mater for installing the Ditra? Thanks, G
Category: Tile Post By: AUDREY SANTOS (Denver, CO), 03/18/2019

Quote: Originally Posted by leadhead I am remodeling a kitchen and removing the old tile. What I found was on top of the floor joists (18OC) was a 1x8 on diagonal with 3/4 inch hardwood floors on top of that. Now half of the kitchen floor is like that the other half is on a concrete slab with a crawl space underneath. My though was to rip out the hardwood floors and put in 3/4 inch plywood to come flush with the concrete slab then install Ditra over both the plywood and concrete before tiling the whole thing. Does that seem to be sufficient to cover the transition between the wood sub-floor and the concrete slab, preventing future cracking? Also the concrete has old black linoleum glue on it, does that mater for installing the Ditra? Thanks, G That black glue may have asbestos in it. We just did this, but the vast majority of the floor was concrete, only a very small wood section. We hit the entire floor with EcoPrim, then feather finished the transition, then used I think Kerabond over the entire floor. Ditra would be a great solution, but be careful with that black glue! Because of the asbestos and adhesion.

- JORDAN LE (Skokie, IL), 03/31/2019

Thanks Dan! So you think if i paint over the cutback residue with Ecoprim, then I should be good to go with an unmodified thinset under the Ditra? Is the Ditra enough to not give me cracking issues where the wood and concrete meet?

- Sam Formisano (Durham, NC), 05/04/2019

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