Foam-core tile backing board has two big advantages over other backer boards. First, it’s super lightweight compared with the rest. A 1/2-inch thick, 3 x 5 foot sheet weighs just 7-1/2 pounds ...

Tile backer boards are used to waterproof fix walls or floor tiles. These boards provide excellent heat insulation for underfloor heating systems. They also protect the floor from absorbing water.