Best Screws for Cement Board
Cement board (Durock, HardieBacker) eats ordinary screws: alkalinity corrodes steel and the brittle board crumbles around standard heads. Backer-board screws fix both with corrosion-proof coatings and wafer heads that seat flush without mushrooming. Drywall screws are the classic, failing shortcut.
What to Look For
- Polymer-coated or stainless — alkali eats zinc and phosphate.
- Wafer or large flat heads spread load on brittle board.
- 1-1/4 in for board-to-plywood; 1-5/8 in for board-to-studs.
- Hi-lo threads cut cement without crumbling edges.
- Star drive — Phillips cam-out destroys backer screws fast.
Top Picks
1. Backer-On #9 x 1-1/4 in cement board screws Best overall
Made for HardieBacker-style board — serrated head seats flush, coating shrugs off alkali.
Check price on Amazon →2. Rock-On #9 x 1-5/8 in cement board screws For studs
Longer bite for board-to-stud installs — Durock-approved geometry that does not crumble edges.
Check price on Amazon →3. Grip-Rite 1-1/4 in backer screws (bulk box) Best value
Contractor boxes for whole-bathroom jobs at a fraction of the per-screw price.
Check price on Amazon →What to Avoid
Avoid
- Drywall screws — they corrode, pop heads, and crumble board edges.
- Roofing nails alone — they hold but rust-streak through tile over time.
- Overdriving — broken facing around the head kills holding power.
Also in the toolbox
- Carbide scoring knife — scores cement board cleaner than a utility blade
- 1/2-in notched trowel — for the thinset under the tile above
FAQ
Can you use drywall screws for cement board?
No — this is the most common backer-board mistake. Drywall screws corrode in the alkaline cement, their bugle heads crumble the board edge, and they pop under tile. Use coated backer-board screws; they exist for exactly this reason.
What size screws for 1/2 inch backer board?
1-1/4 in screws when fastening to plywood underlayment, 1-5/8 in when fastening to studs. Space them 8 in on center over studs, keeping 3/8 in from panel edges.
Nails or screws for cement board?
Screws — specifically backer-board screws. Galvanized roofing nails are code-allowed and fast, but screws clamp flatter and hold better, and coated screws outlast nails against alkali corrosion.
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