A bead of construction adhesive may be used to bond the cement board to the rough top. Screw heads should be flush with the surface. If you're using construction adhesive, work quickly because it begins to skim over in about five minutes and loses its pliability. Meehan presses the cement board into place and jiggles it gently to even out the adhesive beneath it. You may want to drill pilot holes.
Screws hold the cement board down.
Galvanized drywall screws 8 in. Laminate should be scuffed with a 50-grit sandpaper first. Edges can be handled a couple of ways. Another approach is to finish the outside edge with a vertical strip of cement board, and then apply a layer of thinset and mesh tape. Finish edges with thinset.