who knows? If this concerns you, then have the crumbs and your home's air tested.

We had a dark adhesive under our basement carpet that tested positive for asbestos. An abatement company removed it from the concrete. I like knowing that we can change the flooring in the future without any further asbestos issues.

hi my case: Son has an old house (1960). Most of house had dirty carpet when bought and had a flooring company replace carpet without looking under it. Now, years later decided to remove carpet. Under carpet were the 9x9 tiles. Most tiles were okay, but several were broken so took all tile out (they mainly popped up, but some broke and also did some scraping). Some dust was made, but could be from carpet and pad. Mopped floor after. Under tiles is the black cutback mastic, now uncovered. Area is about 200 sqft. Got rid of the tiles so cant be tested, but I assume to contain asbestos. Also removed carpet in a bedroom (10x10), which also has tiles underneath, but left the tiles in place and covered most of area with an area rug. Doubtful any protective masks were used, and certainly not by others living in the house at the time, as well as now. Questions: Is that level of exposure serious (been a few months since removed)? Are roommates at any risk? Can just walking on the exposed mastic release fibers? Should air get tested? What can be used to cover the cutback mastic? Wants to lay vinyl sheeting in the area (or anything else recommended?). Is it okay to re-lay carpet in the bedroom over the tiles? Should he/me be too concerned? Yes, it's done, but knowing risk level will help. Thanks

Carpets contain a lot of asbestos fibers if there are asbestos in the tiles. Hire the professionals for it as it can seriously contaminate your house.