Forty years ago, ceramic floor and wall tiles were always set in a mortar bed. Then a few builders experimented with gluing wall tiles to water-resistant drywall (aka green-board), a method that later was outlawed because it led to mushy drywall and moldy studs. A better solution hit the market in the early 1970s when manufacturers introduced cement backerboard. These panels are impervious to water, so they proved to be an excellent substrate for tiled tub surrounds, shower walls, countertops, and floors.
展开▼
