Can I tile over OSB?
WeÂve removed our old ceramic tile floors in the 2 upstairs bathrooms and are thinking of having 13" porcelain tiles with 1/8" grout lines installed for the new floors. We have 5/8" tongue-and-groove fir plywood then 7/16" OSB glued and screwed to the plywood. Two tile guys who gave us quotes have no issue with that but one guy said that he never installs over OSB and wants to put down Ditra. From looking in the GW archives and a couple of forums I see no mention of OSB Â mainly plywood, CBU, and Ditra or other membranes. If we install the tile over the OSB are we asking for problems?