Use 5 8 inch backer board as a fire rated material similar to type x drywall.
Tile backer board detail.
Its made from cement and sand and is reinforced by fiberglass mats on both sides so it s impervious to water.
It s typically available in 1 2 in.
Excellent tile adhesion to help protect tile work ease of use and performance hardiebacker cement board s unique cement formulation and structure provide the ideal combination of strength uniform composition and performance that no other backer board can provide.
The most common thickness of tile backer board is 1 2 inch.
Use 1 4 inch backer board on curved applications or on vertical surfaces such as fireplaces.
Above the lip of the tub.
Thick 3 x 5 ft.
Just before tiling fill the joints with thinset and cover with 2 inch wide fiber mesh tape unless the adhesive manufacturer recommends otherwise.
Quarter inch and 5 8 inch thicknesses can also be found.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
Durock glass mat tile backerboard consists of a treated water resistant gypsum core that is covered with a coated fiberglass mat facer and back and has a proprietary surface making it ideal for use in wet areas as a tile substrate.
Leave a 1 8 to 3 16 inch gap between adjoining sheets of backerboard and at edges.
Cement board is the most durable trouble free tile backer for tub surrounds showers floors and all other wet areas.
Apply it to the wall with the bottom edge about 1 4 in.