What is this black adhesive? Renovating our house from the 70s. This seems like the original flooring. Since ripping up the vinyl above this vinyl, weve been itching everywhere. : r/whatisthisthing
Possible black mastic asbestos? : r/asbestoshelp
How to Remove Black Mastic from a Concrete Floor - SealGreen
Black mastic vs mold | Contractor Talk - Professional Construction and Remodeling Forum