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-   -   Will mortar stick to vinyl tile adhesive on a cement basement floor? (

samik 10-15-2011 08:33 PM

Will mortar stick to vinyl tile adhesive on a cement basement floor?
I'm installing porcelain tiles in my basement, and there is a section that had old vinyl tiles glued onto the cement. We pulled up the old vinyl, but the glue is still there (kind of a blackish color, and not tacky anymore). Do I need to remove the old glue so that the mortar will stick? If so, what method would be best? Thanks

Ron6519 10-15-2011 10:22 PM

I'd do a test. Mix up some thinset and put a tile down on each area, glued and nonglued. Next morning pop them up. See what happens.

samik 10-15-2011 10:32 PM

Thanks for the quote about our liberty! Couldn't agree more with Ben.
For the tile, I assume that there will be a difference in the adhesion- how much adhesion is sufficient?

stadry 10-16-2011 05:32 AM

doubtful you'll have acceptable adhesion + the remaining ' black ' stuff's probably got asbestos in it - we diamond grind w/dust collectors prior to laying anything but its your project :wink:

oh'mike 10-16-2011 05:39 AM

Call Mepai--I believe the Kerabond when mixed with Keralastic is approved for use over 'cutback' adhesive.

Also using Jiffset floor leveler when mixed with Linewebers latex also will encapsulate cutback.

Check with the manufacturer.---

Scrape as much of with a razor scraper----NEVER use solvents EVER--They soak into the concrete and make bonding tile on top very unlikely.

samik 10-16-2011 03:36 PM

Thanks for all the great advice! Especially about the solvent, which the apron guys had recommended...:no: I will check with Mepai to see if thier adhesives will work. If not, I will try to rent a diamond grinder with dust collector- I assume these will prevent any spreading of dust. BTW, I used a vibrating electric scraper to scrape off the tiles. I hope we didn't already get asbestos-ized...

Bud Cline 10-16-2011 03:47 PM

Most thinset tile mortars that will bond over cutback adhesive say so on the label. Read the label. Typically a razor-blade scraper is used to reduce the black coating to only a stain. You don't need to rent anything especially anything diamond.:)

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