Q: I'd like to use a coated glass mat tile backerboard like DensShield in a shower stall, but would like to stop the tile about 78 inches above the floor rather than completely covering the walls and ceiling. Is it okay to continue the backerboard all the way up to the 8-foot-high ceiling - which would be covered with the same material - and then simply paint the nontiled areas? If so, how should the textured surface of the tile backer be prepped for a smooth, painted finish?
