Laying Self-Stick Vinyl Tiles over Asbestos Mastic?
Since this is a bathroom, why not return the vinyl tiles and install
ceramic tiles? The floor just needs to be resonably smooth, not
perfect. The thinset will take care of irregularities. I had the same
situation in my den, had 9X9 tiles that came up and left black mastic
on the floor. Installed ceramic tiles over it with thinset, no
problems after 5 years. Rock solid.
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