In showers the standard substrate is tile backer also called cement board or cement backer board. For cement backer board Duralock is great as its more durable to water and moisture in the shower. Basement Bathroom Shower Pan Mortar Bed And Cement Backer Board On Walls Concrete Shower Pan Building A Shower Pan Shower Pan Tile Even the slightest amount of movement in a building structure can telegraph to the tile. Backer board for shower . In showers the standard substrate is tile backer also called cement board or cement backer board. Cement board is the most durable trouble-free tile backer for tub surrounds showers floors and all other wet areas. This requires shimming the backer board out from the studs so the wall is plumb. Ceramic and porcelain tile more than almost any other surface material needs a stable flat flex-free substrate. Cement backer board is waterproof used for tiled shower surrounds and floors in wet areas. If youre wanting to install a shower then Dura...