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    wayneeford's Avatar
    wayneeford Posts: 1, Reputation: 1
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    #1

    Jul 19, 2009, 05:14 PM
    cleaning cement floor for tile
    I have removed 9x9 ceramic tile over cement, I was wondering how clean do I have to have the cement from the old mastic to install 20x20 ceramic tile.
    Bljack's Avatar
    Bljack Posts: 245, Reputation: 28
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    #2

    Jul 20, 2009, 04:21 AM
    Get the adhesive removed to be just a staining and then choose any thinset that lists old cutback adhesive as one of the things it can be spread over. The old cutback adhesive may contain asbestos so wet an area before scraping it with a 4" wall paper scraper. Suck up the water with a shop vac with a hepa filter, and tile away.
    Ceramictec's Avatar
    Ceramictec Posts: 1, Reputation: 1
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    #3

    Jul 20, 2009, 09:20 PM
    Quote Originally Posted by wayneeford View Post
    I have removed 9x9 ceramic tile over cement, i was wondering how clean do i have to have the cement from the old mastic to install 20x20 ceramic tile.
    cutback wouldn't be used to set ceramic tile and I sure hope mastic wasn't used too.

    Your going to need to remove the old thinset left by grinding or floating over it with a thinset or and SLC
    Bljack's Avatar
    Bljack Posts: 245, Reputation: 28
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    #4

    Jul 21, 2009, 07:02 AM
    CERAMICTEC!!! CERAMICTEC!!!

    :eek: :eek: :eek:

    WHO INVITED THIS GUY?!

    Hey Bri, what's up? Welcome, my friend. :)
    foxrocks's Avatar
    foxrocks Posts: 3, Reputation: 1
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    #5

    Jul 21, 2009, 04:36 PM

    Grinding and scraping is the way to do it, if you have the right grinding disk it's a non problem
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