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Old 07-04-2005, 05:27 PM   #1
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Join Date: Jul 2005
Posts: 1
Tile over acid-stained concrete

Hello all,
We have concrete floors with acid stain on them. We sealed them with a silicone sealer (HC) and wax. We have decided to tile the kitchen portion of the floor. Does anyone have any suggestions about how to prep the floor for tile? We plan on using thinset. We are specifically interested in an alternative that doesn't use backer board.
We also would appreciate any advice about creating the threshold between the kitchen tile and the existing concrete floor.
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Old 07-04-2005, 08:29 PM   #2
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Join Date: Jul 2002
Posts: 30,274
Welcome, Sydney!

Any tile prep suggestions from this board will not include backerboard over concrete!

You gotta strip off the sealer and wax. You can use mineral spirits to remove the wax, but you gotta be careful with it, it's flammable.

The sealer is another story. Since you know who made it, you can contact them for removal suggestions.

The final result amy still be a problem, especially if the stripper leaves a residue on the concrete. If so, then you'll need to grind off the very top of the concrete to expose fresh, clean concrete. Then you can use a good modified thinset to set the tiles.

As for transitions back to the concrete level, check out Schluter's line of edgings. They are bonded to the concrete as you tile. www.schluter.com
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