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Old 04-25-2012, 08:11 AM   #1
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Schluter DITRA on stable concrete subfloor

Newbie question. Remodeling a small bathroom shower and tiling the bathroom floor as well. The building is a converted factory with 16 inch thick concrete floors. Until we pull up the wood we won't know the true condition of the concrete but from other places in the building it all seems in very good shape. A local Craigslist posting has someone selling the remnants of a roll of DITRA for a good price and I was wondering whether it would be worth installing it or a waste of time and money? I haven't met the tile guy yet would they have any objections to using it in general? I do realize it would be an extra step of course.
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Old 04-25-2012, 08:32 AM   #2
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Welcome, Dean.

Even SOG (Slab On Grade) concrete floors can benefit from the sort of uncoupling action provided by materials like Ditra. Will it guarantee your tile installation won't crack? No, it won't. But I'd recommend you use it anyway.

On your above grade concrete (I'd hafta question the 16" thickness part), you encounter more and different issues and some sort of membrane might be even more beneficial.

Even if the intended use is residential and the floor area small, I'd be inclined to use the Ditra or other such membrane.

My opinion; worth price charged.

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Old 04-25-2012, 08:36 AM   #3
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if the concrete is in good condition you dont really need the ditra just a good modified thinset but it cant hurt to use it either. it will only make for a better floor in the long run. i dont know about your tile guy but any time a home owner wants me to use materials to make a better floor im all for it.
tile setter 12yrs exp.
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Old 04-25-2012, 12:14 PM   #4
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I sincerely appreciate both replies!
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Old 04-25-2012, 03:42 PM   #5
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make sure you read the thinset directions on the Ditra and understand them.
and dont use a Un Modified thinset from Home Depot.
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