Hi, I've just finished tiling my bathroom floor using the sticky written by gcol, and made although I say it myself a really good job of it. thank you gcol. Now I am going to start on the kitchen and back hall. My query now is that the kitchen has a wooden floor to screw ply onto but the back hall has a concrete floor. Will I glue the ply onto the concrete and if so what type of adhesive is best to use Any advice is very appreciated thank you