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Old 12-23-2011, 12:43 PM   #1
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Tile over asbestos free cutback


I want to put porcelain tiles over about 400 sq ft of left over cutback adhesive. Got it tested and it's asbestos free. The Lowes guy that came over to measure mentioned they could just put an layer of something over it first before applying the thinset. Is that a good way to go? What is the first layer they are putting in and are there alternatives? The cutback is pretty thick, but I tried scraping and quite a bit of it does come off, but the surface still won't absorb water. The lowes contractor didn't even mention don't any prep or scraping, he's just going to lay that base layer right on.

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Old 12-23-2011, 02:48 PM   #2
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Tile over asbestos free cutback


I hope another tile pro clears up any thing I say----

This is what I do--
Scrape off as much as possible with a razor scraper
If the floor needs leveling--I'll pour and spread Jiffset self leveling compound ,mixed with Lineweber liquid latex---that will bond to the cutback and create a good surface for a modified thinset.

If no leveling is required--I simply use an unmodified thinset mixed with a liquid latex.
Kerabond and Keralastic is a good example----

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Old 12-23-2011, 03:08 PM   #3
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Tile over asbestos free cutback


I would never have Lowes or Home Dept install anything. Go to a real flooring store and have them do it.
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Old 12-23-2011, 03:13 PM   #4
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Tile over asbestos free cutback


The industry chatter for years has always been to scrape-away as much as will scrape-away. Then...there are modified thinsets available that will work over cutback adhesive residue.

There are products that can be skimmed over the cutback but I have no idea why anyone would spend the time and money to do that when there are thinsets that will adhere to the cutback anyway.

oh-mike's suggestion of mixing your own modified thinset from unmodified thinset using an additive is a good method that will produce a stronger bond than some ordinary modified thinsets out of the bag, but, I'm not sure it is necessary in this case.
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Old 12-23-2011, 09:41 PM   #5
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Tile over asbestos free cutback


thanks for the suggestions. I'm having a tile pro come over as well. What thinset product would you suggest that is ready to lay over scrapped cutback? Thanks,
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Old 12-23-2011, 11:19 PM   #6
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Read the information on the product bag. All thinset manufacturers make a suitable thinset. Just depends on what brands you have available to you.

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