What Screws For Cement Board

Cement board attached to plywood or similar underlayment will hold with only 1 1/4-inch screws; for thick or heavy metal fixtures, use 1 5/8-inch screws. In general, 1 1/2-inch galvanized nails will hold the board firmly in place.

Can I use drywall screws on 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 kind of screws do you use on Hardie 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. 8-18 x 3/8” HD). Why can’t I get screws to sit flush with the HardieBacker® cement board?.

Can I use deck screws for cement board?

I think the screw will care. I don’t install cement board for a living, but from talking with people/professionals who do, the proper screws should be used. You can’t just use any screw or they will corrode in that application, and Ive seen badly corroded screws from using incorrect ones. Definitely not drywall screws.

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 Thinset do I use for cement board?

An unmodified thinset (Masterblend) is fine between the Hardi and the subfloor. Tara, The reason for the layer of thinset between the cement board and the subfloor is to fill the voids/gaps between the two. It’ll keep the cement board from moving up and down.

How long should durock screws be?

DUROCK Steel Screws come in two lengths: 32 and 42 mm (1-1/4 and 1-5/8). Design: Both wood and steel screws are a wafer-head design with strip-out-prevention ribs and self-drilling points; screwheads are a minimum of 10 mm (0.40) in diameter; driving recess is a No. 2 “Phillips” design.

Can you use screws for cement siding?

HardiePlank® lap siding may be used with fasteners approved by ICC-ES ESR-2290 spaced in accordance with the Wind Load Tables. Fasteners must be corrosion resistant, galvanized or stainless steel. Fasteners shall be installed between 1 in. and 3/4 in.

Do you use nails or screws for Hardie board?

Fasteners must be corrosion resistant, galvanized, or stainless steel. Electro-galvanized are acceptable but may exhibit premature corrosion. James Hardie recommends the use of quality, hot-dipped galvanized nails. James Hardie is not responsible for the corrosion resistance of fasteners.

How many screws do I need for cement board?

Q: How many screws do I need to put into a sheet of cement board? We recommend referring to the cement board manufacturers guidelines for screw pattern. In floor applications, screws should be placed every 8″”. You will use approximately 55 screws per 3′ x 5′ cement board and 91 screws per 4′ x 8′ cement board.

Do you need thinset under cement 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 use stainless steel screws for cement board?

Now there is a better way to attach fiber cement board siding and trim, or cement backer board to metal studs: Use stainless steel Square Drive cement board screws! In addition, they have a deep, aggressive thread for superior holding power, and the strength and corrosion resistance of 410 stainless steel.

Can I 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.

What do you do with a gap between tub and cement board?

Technically, after the tile is installed over the backer board that gap between it and the tub ledge should be filled with an ASTM C920 sealant (caulking e.g. silicone). Although some say you should have weep holes along this gap so any water behind can weep out into the tub.

How long should cement board screws be?

Cement board attached to plywood or similar underlayment will hold with only 1 1/4-inch screws; for thick or heavy metal fixtures, use 1 5/8-inch screws. In general, 1 1/2-inch galvanized nails will hold the board firmly in place.

Why do people tape cement board seams?

The thinset and mesh tape are to strengthen the seams. If you are going to tile over the cement board, you should tape the seams. This should not be that difficult. Pack in thinset, lay on the tape, and flat-knife to get it set in.

Can you tile directly over cement board?

Cement board forms a durable, stable base for tile, and it has no organic materials (unlike drywall, greenboard, or plywood) so it is not prone to mold, rot, shrinkage, or decomposition due to moisture. Ceramic tile laid over cement board is one of the most durable floor or wall surfaces you can install.

How many screws are in a sheet of durock?

Fasten the DUROCK Brand Cement Board with 1-1/4 hot-dipped galvanized roofing nails or 1-1/4 DUROCK Brand Screws. In both directions, the floor must be at least 1/3.