floor tile over knockdown?


Old 04-24-14, 10:22 AM
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floor tile over knockdown?

We want to install porcelain tile on our lanai floor, which is currently a knockdown textured surface over concrete. Does this need to be removed (and can that even be done) or can we install directly over it? Also, we live in FL so freezing temps aren't an issue and our house is 10 years old. There are no cracks in the current surface so do we need an antifracture membrane? The quote we got is an additional $1200 just for the membrane (for $700 worth of tile over 320 sq ft). This seems absurd to me! Any feedback is appreciated!
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Old 04-24-14, 04:59 PM
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Welcome to the forums! Since we can't see your floor, we can' give much input on it. If the surface is concrete and is reasonably flat, you may be able to put the tile on it. Ditra is expensive, but probably to the tune of about $500 for your floor. Not that you would need it, but it is a good insurance policy.
Old 04-25-14, 09:07 AM
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I'm not sure what to do either without pics and knowing the makeup of the texturing material. If it's a gypsum product, I think you should remove it. If it's a Portland product and it's flat, you may be able to go over it.

You didn't mention which anti-fracture method they quoted. Larry mentioned Ditra, but Ditra is not an anti-fracture membrane, it's an uncoupling membrane. 320 ft. of Ditra installed, won't be $1200.

Being a lanai you need to do several things that an indoor installation doesn't require. You can't just slap it down and grout.

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