Frequent question: Should cement board screws be flush?

cement board screws every 8 in. … Drive screws flush with the surface of the board, being careful not to break through mesh. Avoid driving them at an angle.

Do cement board screws need to be flush?

They should be flush or really close to it. Especially if you are painting over with a waterproofing membrane. I throw three backer screws in a sheet and then do pilot holes with a bit the size of my head about an 1/8″ in.

What is the screw pattern for cement board?

Use the fastener pattern as a guide. Fasten HardieBacker cement board with specified nails or screws (as listed in “Materials Required”) every 8 in over the entire surface. Keep fasteners between 3/8 in and 3/4 in from board edges and 2 in from board corners.

What is special about cement board screws?

Cement Board Screws are designed for attaching HardieBacker or equivalent fiber cement backerboard to wood or light gauge steel studs. Backer-On Rock-On’s patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile. … These screws work great in all cement board brands.

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What is the best way to fasten cement board?

In general, 1 1/2-inch galvanized nails will hold the board firmly in place. For flooring or wall installation, some builders choose to apply a thin layer of thinset mortar under the cement board to prevent any shifting or expansion. Even if you use this extra adhesive, you should still apply the nails or screws.

Can you just screw down cement 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. … It is important to highlight that screws shall not be installed all the way down to the floor joists.

Can you tile over screws?

Screws cannot go into tile until you create a pilot hole for it. That work requires a carbide or diamond-tipped bit and some careful drilling. Start the drilling process by placing an “X” with masking or painter’s tape on the tile. Taking this action prevents the drill bit from slipping while you work.

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 nail or screw Hardie board?

What is the correct fastener pattern for installing HardieBacker® cement board? Fasten HardieBacker sheets with proper nails or screws (as listed in ”Materials Required” in the backer installation instructions) every 8” around the perimeter and all supporting studs.

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What do you put on seams of cement board?

Use special mesh tape on seams

Cover all of the corners, joints and seams, including the joint where drywall and cement board meet, with the fiberglass mesh tape.

Can you use Liquid Nails on cement board?

LN-907 Liquid Nails is recommended for cement board and most other common building materials. The application temperature is from 22 to 120 Fahrenheit and the service temperature is -20 to 140 degrees Fahrenheit. This makes it ideal for just about any DIY project and on most construction projects.

Can I 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.

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.

Can you tile over old cement board?

Since backer board is relatively inexpensive, it’s not normally worth the time and labor it would take to remove the tile to save it. … If it has minor damage, such as a few dents and dings, you can use tile mortar to patch or even out these spots.

Can you staple cement board?

There is a 1/2” crown on the 18-gauge coated stapler. Minimum 1-1/4” long roofing nails or ribbed countersink screws are required for HardieBacker 500 cement board. The chisel point stapler must be at least 7/8” long and coated in 18-gauge.

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What Thinset do I use for cement board?

Installing cement board over a wood subfloor

The good news is that, basically, any thinset mortar will work for this. Some manufacturer’s instructions say to use a modified mortar and you should follow those instructions.