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Follow up: We were able to get this stuff off, but it took some doing. Scraping turned out to be really slow and ineffective. We ended up pressure washing it first (which was still painfully slow, the nozzle had to be less than an inch from the concrete to be effective). Pressure washing...

Thanks everyone. I am working with a new contractor to figure out how to get this stuff off. Maybe scraping + pressure washing will be enough, rather than sand blasting. I am guessing at the thickness, but probably like 20-30mils or so. It became mostly dry but still tacky after 2...

The manufacturer recommended removing it because it will not cure properly inside. He said it could out gas for years because it doesnt have the heat of the sun to cure it. He said it could be removed by scraping with a hot spud bar and then sandblasted.

Thanks Neal, I have contacted them and will see what I can find out. Have you ever heard of this type of material being used in this way before?

Thanks Gary, That's what I was afraid of... unfortunately I am firing the contractor for shoddy work and not keeping schedule... so I am not sure if I can get him to show up and remove it.. Is there any good way to seal it in? Is it safe to have on the interior side of the slab? or...

I am converting a garage into a living space, and my contractor put a layer of roofing asphalt/cement as a vapor barrier on the entire floor and foundation wall. The garage is at grade level. It did not have any particular moisture or dampness problem, and I do no know if it had a vapor barrier...