I pulled up some vinyl tile in my bathroom while redoing it, and it as well as the subfloor underneath had some black tarry residue on it. I did some research and found that it is possible that some vinyl flooring as well as the adhesives used could contain asbestos. I ripped off a piece of the tile to have it examined and sealed the spot the best I could, but I was curious is anyone here is familiar with the risks involved or has run into a similar situation. My house was built in 1979. The tiles are 12in x 12in, are very thin and brittle, and have a decorative pattern on them. The adhesive used appears to be black in color and somewhat sticky. I know that there was a ban enacted to stop the use of asbestos in building materials in the late 70's. Any advice would be appreciated, as I'm a novice at working with this kind of stuff