tile over vinyl
bathroom has plywood floor. think it might be 1/2". will measure it. has glued down vinyl in good shape. floor joists are 16"oc. can 1/4" cement board be laid on top of vinyl or do i have to somehow scrape up the vinyl? am planning on using 12" ceramic tiles. i imagine the subfloor thickness is critical. is it 1/2" or 3/4"? is it more than 1 layer? should i use thicker cement board?