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Do you need underlayment for cement board?
No extra layers of underlayment are required. Just screw the floor down with 1-5/8 in. drywall screws spaced every 6 in.
What is cement underlayment?
Ardex Engineered Cements. Underlayments, unlike their overlay cousins, do not get a chance to see the light. Their main purpose is as a thin topping to level, smooth, or fix imperfections in concrete substrates prior to installation of other floor coverings, such as tile, carpet, or vinyl.
What is cement board used for?
The primary purpose of cement boards is to serve as backing for tile and is superior to paper-covered gypsum at this task because of its resistance to water – as tile is typically used in areas prone to water exposure, it is important to have a backing that will not develop mold and mildew or disintegrate after …
What do you put down under cement board?
The Surface Below the Cement Board There is no need to install backer board on a concrete substrate—ceramic tile can be applied right over concrete, provided the surface is flat, smooth, and free of significant cracks.
Why do you use cement board for tile underlayment?
of 08. Why Use Cement Board? Cement board (used in tile underlayment) is now standard for most tile installations, but particularly for floor tile. The primary benefit of cement board is that it doesn’t break down or expand or warp if it gets wet.
What kind of tape to use for cement board underlayment?
Do not use standard drywall joint tape. Make sure the tape fully adheres to the cement board. Continue to 8 of 8 below. Cover the joint tape with a thin layer of thinset mortar, using a 4- or 6-inch drywall knife. Smooth the mortar so it is flush with the surrounding surfaces.
Which is the best underlayment for tile flooring?
Cement board (and other types of tile underlayment) is now standard for most tile installations, but particularly for floor tile. The primary benefit of cement board is that it doesn’t break down or expand or warp if it gets wet.
What kind of screws to use for cement board underlayment?
Fasten the cement board sheet to the subfloor with 1 1/4-inch cement board screws. These are specially coated, corrosion-resistant screws that have notches under their heads that help the screws burrow into the board so the heads sit flush with the panel. Don’t use regular drywall or wood screws, which corrode in cement board.