Therefore, drywall screws or nails will not work for cement boards. The fasteners designed for use with drywall do not feature the corrosion- and alkali-resistant coating that enables the cement board or galvanized fasteners to last.
Do you need special screws for backer board?
To attach the cement board to the studs, you’ll need special 1-1/4 in. cement board screws (see Fig. B). These screws have a coating to resist corrosion, a special wide head with cutting flutes and hi-low threads for a strong grip.
Can you screw down tile backer board?
Screw and Joints
Do not use drywall screws as they are not recommended to be used to hold the backer board in place. All of your backer board pieces should be cut before they are placed on the floor. Along the perimeter, screws should be installed at least ½ inch from the edge, but no more than 2 1/4 inches.
What screws do I use for Hardibacker?
What type of fastener do you recommend for floor and wall applications of HardieBacker® cement board? In compliance with the tile industry, James Hardie recommends 1-1/4” long galvanized or stainless steel roofing nails (0.121” shank x 3/8” HD) or 1-1/4” long corrosion resistant ribbed waferhead screws (No.
Can you screw cement backer board?
Cement board can be used just as effectively on walls, such as showers and bathtub surrounds, as it is on floors. Doing this will require that you remove the existing surface material before installing backerboard over the studs. … Never use standard screws when installing cement board. It will corrode the screws.
Can you use drywall screws in cement board?
You don’t want to use regular drywall screws for cement boards. They can corrode, they can break down the edges of the boards, and they won’t drive in flush properly. Use ITW’s ROCK-ON and BACKER-ON screws instead.
Do I really need thinset under backer board?
Using thinset under cement board is a commonly skipped step amongst many contractors. … However, many manufacturers including, both Durock and Hardiebacker not only recommend that you use thinset under their backerboard, but they specify it and will void the warranty on their product if it’s not used.
Can you put backer board over drywall?
Because cement board can be used either for floors or walls, the surface below the cement board will vary: … In such wet areas, never install cement board directly over drywall or green board. Instead, first, remove the existing surface material, then install the cement board over the studs and membrane, as applicable.
Can you use wood screws in Hardibacker?
Deck screws will work fine.
Can you use screws for Hardie board?
James Hardie recommends 1-1/4” long galvanized or STAINLESS steel roofing nails or 1-1/4” long ribbed waferhead screws in compliance with the tile industry. It is 8-18 x 3/8” HD.
What is the difference between backer on and rock on screws?
Rock-On screws are designed for fiber-glass cement boards. Backer-On screws are designed for fiber cement boards.
What kind of Thinset goes under cement board?
Embed the cement board in latex-modified thin-set mortar The main reason for using thin-set between the cement board and the subfloor isn’t as much for bonding as it is for even, void-free cement board support throughout the floor.
What do you do with a gap between tub and cement board?
Ideally, you would leave a 1/8 inch gap which would then have the sealant applied to it. Either stopping the cement board above the tub flange or alternately shimming it out and dropping it down near the tub would both be good options.
Do you have to tape backer board seams?
For tile backer boards such as Durock, Wonderboard, Hardiebacker, Permabase, and others the seams between the board need to be treated with 2-inch alkali-resistant mesh tape. … It helps to make the walls that are to be tile more monolithic.