Tiles and redgard


Old 07-03-10, 08:36 AM
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Tiles and redgard

I am installing tile in my entire house. In 3 rooms, there was old wood with 1950's black mastic (likely asbestos) Rather than scrape the mastic, we covered it with a layer of Redgard, and will install the tile on top.
Will this work? Any thing else we should do?
Also, the rest of the rooms are just bare concrete with a lot of cracks. (we live in California) Should we extend the Redgard over everything? Or just put the tile directly over the concrete?
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Old 07-03-10, 07:50 PM
Join Date: May 2007
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I have a few questions for you.

Where did you read Redgard is suitable for use over cutback adhesive, or any adhesive or contaminate?

If you did find the recommendation for that application, (please let us know where), did you apply Redgard at a minimum of 30 mils wet thickness as measured with your wet film gauge?

I have a strong feeling you should be scraping 3 rooms.

You obviously need to do something in those other areas. Redgard applied as directed is one option. I would use Ditra instead, but there are many ways to go.

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