I want to install 5/8" bamboo hardwood floors and ceramic tile in my recently purchased 31 Y/O house. Right now under the carpet and vinyl flooring is 5/8 toungue and groove (on a 45), with 5/8 particle board nailed on top, throughout. I understand the particle board will have to be replaced with some real plywood, so I can nail the flooring into the plywood. My question is will the particle board be OK where the tile is going to go? since the tile gets glued, not nailed. Is this true?