Water_resistant backer board, not drywall, should be used under tile that is likely to get wet (shower walls and bathroom floors, for example). Whether it's backer board, plywood, or concrete, the substrate needs to be sound, clean, and dimensionally stable. Surfaces need to be level or plumb and true to plane, as the pros say__that means no bumps. Wallpaper, loose plaster, flaking paint, peeling tiles or unsecured sheet flooring must be removed from the walls or floors that are to be tiled.
STEP 2: Measure __ Walls __ When tiling a wall, you'll want to establish a top line that is level. Few walls are truly plumb, so use a level to mark the top line. Establish its height so that you won't have to cut very thin tiles (or cut very thin shards from nearly full tiles) to come flush to the floor. Snap a top line on your walls, and then snap a center line, too. Be sure to lay out all the walls you plan to do before you begin tiling.
by Tangela D. Padilla on Jul 31, 2018 Ceramic Tile