JazMan, You seem to know your stuff but this nazi site won't let me PM you to ask a question. I have carpet with a cushion erneath andwhat looks like this black sound barrier under that, The black stuff I have to scrape up and under that I think there is this backer tile ontop of the concrete that looks to be about 3/32 inch thick and made of some type of concrete type material, it is dense. It looks like it was put down onto the concrete with some type of black adhesive. My question is what do I need to remove or clean up in order to install tile on the concrete. HELLLLLP!