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Discussion Starter · #1 ·
I am laying Ditra over concrete which previously had carpet. I am using Ditraset to lay the Ditra but the floor still has some of the glue residue from the carpet. It isn't much and we tried to scrape it but I am concerned about putting thinset over it. Will the thinset bond fine to that or do I need to coat the floor with something prior to thinset? If so, what should I use to coat it? Thanks for the help!
 

· Tileguy
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You should scrape it off until you see mostly plain concrete. (The directions tell you how the floor should be.) Even then, I would also consider using a modified thinset for this step after removing the adhesive.

Jaz
 

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Discussion Starter · #3 ·
Thanks Jaz! It is pretty well scraped off now. The floor looks like concrete but if you get down and look or touch it you can still see and feel some of the swirled glue.

Someone suggested using Welcrete or even Redguard over top first. Would that be a good move or an unnecessary step?

Thanks!
 

· Tileguy
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Definitely not Redgard, that was a WAG. I think if the floor was scrapped with that razor blade and you got it down to concrete, you could switch to a good quality modified thinset instead of using the Ditraset to install your ditra.

Or you can go all out and use either this if you can find it; http://www.custombuildingproducts.com/TDS/TDS-258.pdf

Or this;http://www.mapei.com/US-EN/Tile-&-Stone-Installation-Systems/Bond-Promoting-Primer/ECO-Prim-Grip

In all cases you'll use modified thinset instead of Ditraset.

Jaz
 
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