BuildDirect offers a clear and approachable breakdown of how fiber cementboards differ from cementboards, describing the pros and cons of cheaper and lighter materials without going into brand name preference. It settles on simple cement backerboards as a favorite, an opinion Redblock seems to share. In fact, HardieBacker details in numbers why a solid, nonaggregated cementboard is the strongest and most durable option. As for the waterproof surface, this is easily solved by sealing corner joints with silicone caulk and painting the secured surface with a waterproof sealant.
A fragile or flexible backerboard will crack the tiles and grout mortared to it as it shifts, warps or breaks. This type of backer board is lighter than cement board and is ideal for damp spaces like the tub surround in the bathroom, although it can become damaged if water gets behind it. While not considered backer board, water-resistant drywall can be used in spaces where occasional splashes may occur but which are otherwise dry, such as a glass-tile backsplash in the kitchen. Alternatively, instead of backer board, you can use two layers of plywood topped with a waterproof uncoupling membrane, which is a lightweight plastic underlayment that allows independent movement between the tile and the plywood to prevent cracks in the tiles and grout.
Backer board is usually a simpler way to go than plywood. Laying tile directly on a surface like plywood or an existing floor can cause major problems down the road. Tile installed directly over wood will likely buckle as it absorbs moisture, and the wood will be susceptible to mold and mildew. Additionally, wood substrates expand and contract with temperature and humidity changes, which makes it an unsuitable surface for tile.
Tile laid directly over an old linoleum or vinyl floor may shift and break if the surface contains air pockets or is susceptible to moisture.
Laying tile directly on an existing floor can also cause problems if the tile is very heavy or will be supporting heavy furniture. Half-inch cement backer board is ideal for most tiling jobs, including walls, floors, countertops, and ceilings. You can cut cement and gypsum backer board with a jigsaw fitted with a carbide blade. Press the backer board firmly into the to mortar, then screw it to the sub-surface, placing screws around six to eight inches apart.
Fiber cement board is the other common type of cementitious backer board. It is made of a mixture of cement that has been reinforced by fiber throughout. It can be used in dry and wet areas and is water durable for use in tub surrounds.
It is traditionally used on walls where the tile does not cover the entire wall, because the board can be finished with paint. If one of the walls of your tub surround extends out into the bathroom you have the option of tiling the "dry" portion of this wall or leaving it bare and painting it.
Read and follow the manufacturer's instructions is your best bet. I was just confused about minimum subfloor thicknesses that I've read about. The cbu does NOT count as a strength issue All times are GMT The time now is PM. User Name. Remember Me? Mark Forums Read. Tile Calculator.
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