Hello, First time poster here ... I've searched the forum and seen some discussions on sheet linoleum flooring, but nothing on tiles so I hope these are new questions. Anyway, We're replacing our floor that runs from our kitchen and into our entrance hallway with new porcelin tiles. The kitchen has been built up with an extra 1/4" underlay and since both the kitchen and hallway have to be at the same level for the floor, we figured we'd just rip both the kitchen and hallway back to the first rough floor and start with new underlay. But when I pull a vent cover, it appears that there were tiles placed back over the first sub floor. Our house was built in the late 1940's. Would you expect the tiles to contain asbestos at that vintage? Can I safely rip the tiles out? I understand that tiles aren't as likely to release fibres. I was thinking about just ripping up the underlay they are secured to and leave them as undisturbed as possible. How can they be disposed of? Any other suggestions? Thanks for your help.