Table of Contents
What screws do you use on concrete 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 I use drywall screws for 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.
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 kind of screws are used 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 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.
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 I need a special blade to cut cement board?
Use a carbide-tipped wood-cutting blade to minimize dust. Cement is a very hard material, so you’ll need to use a blade that can handle the material. Carbide-tipped wood-cutting blades have fewer teeth than other circular saw blades and the carbide can withstand the strain of the cement.
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.
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 use screws on Hardie trim?
ET&F or equivalent fasteners or screws may be used to attach HardieTrim boards to steel frame construction. Fastening instructions are similar for all applications.
Can you use screws on fiber cement siding?
Nail Fastening Fiber Cement Siding You can fasten fiber cement with roofing nails, as well as select versions of screws, siding nails, and common nails. You can use electroplated fasteners, but it’s better to use stainless steel or hot-dipped galvanized fasteners.
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 do you thinset cement board?
Spread thinset over the screw depressions across the backer boards, leveling them. Let the seams and screw depressions dry overnight. Apply another layer of thinset over the seams and screw depressions, and blend the material out in all directions with the trowel.
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.
