SteveBell wrote:

My client wants ceramic or porcelain tile on her back porch. The
previous owner had glue-down green carpet/fake grass there. My question
is: Can I put thinset down on top of the remaining skim layer of carpet
glue?

An Internet search gives me advice all over the map: remove it with
solvents/don't use solvents because they soak into the concrete and
keep thinset from sticking; remove it with abrasives/don't because it
just melts and wastes time; remove and replace an obscenely thick layer
(1/4 - 1/2 inch) of concrete.

* The surface is smooth and even, and it is sloped properly.
* I power-washed it awhile back, and the glue washed off just slightly.
* I plan on scraping with a 4" razor in any case.

The fact that the glue dissolved slightly makes me hopeful that
water-based bedding material will "bond" with it. On the other hand, it
makes me worry, also, that it won't.

I'll take any advice I can get.

Customer had that on an outside patio that he decided he wanted tiled. Get
as much up as possible and scrap with a heavy duty scraper. I got most of
it up I also used some solvent made for that purpose. Just use a good thin
set for concrete and it should be fine. I did this job 4 years ago and it
seems to be holding up fine.
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