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Products   Backer-On® Rock-On® Cement Board Screws

Backer-On® Rock-On® Cement Board Screws

Backer-On Rock-On® cement screws are designed for attaching HardieBacker® and Durock® cement boards to wood or light gauge steel studs. The patented serrated head design countersinks for a flush finish even at angle, providing a smooth surface for tile installation. The T-25 Star Drive recess provides Stikfit™ for one-handed installation. Climacoat corrosion resistant finish prevents rust from bleeding into grout. Making it perfect for use in high moisture areas such as bathrooms and kitchens.

Backer-On Rock-On® cement board screws comply with ANSI standards for cement board installation as specified by cement board manufacturers. Cement board manufacturers require ANSI compliance in order to remain eligible for warranty.

  • Serrated Head: Designed to drive flush even at an angle
  • Star Drive with T-25 Bit: Provides Stikfit™ for easy one-handed installation and eliminates cam-outs
  • Hi-Lo / Single Threads: Starts quickly and drives smooth in cement boards
  • Sharp Points: Offers immediate pick-up and eliminates the need to pre-drill
  • Climacoat Finish: Corrosion resistant for preventing rust from bleeding into tile

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Product Information

MAIN APPLICATIONS

BATHROOM

 

KITCHEN

 

FLOORING

 






 

Backer-On Rock-On Available Sizes






 

Backer-On Rock-On Technical Documentation

CBS How To Install

Why Backer-On Rock-On?

Backer-On Rock-On Screws provide the optimal fastening solution for installing fiber cement board to wood or steel framing. Backer-On Rock-On Cement Board Screws conform to ANSI A108.11 Standards for cement board installation.







 

*HardieBacker – Registered trademark owned by James Hardie, not affiliated with ITW

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FAQ’s

Can Backer-On Rock-On be used with backer board over plaster?

No, Backer-On Rock-On screws are not designed to go through plaster.

Can Backer-On Rock-On screws go through steel studs?

Yes, Backer-On Rock-On screws can be used in 26 to 22 light gauge steel.

Are Backer-On Rock-On screws approved for use in treated lumber?

No, Backer-On Rock-On screws are not approved for use in treated lumber.

Are Backer-On Rock-On Screw ACQ approved?

No, Backer-On Rock-On screws are not approved for ACQ.

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.
In ceiling applications, screws should be placed every 6"". You will use approximately 55 screws per 3' x 5' cement board and 150 screws per 4' x 8' cement board.
In wall applications, screws should be placed every 8"" when connecting to the wall studs. This will amount to roughly 25 screws per 3' x 5' cement board.

Can Backer-On Rock-On screws be used on Hardiplank?

No, Backer-On Rock-On screws are not approved for exterior applications.

What is the Climaseal coating made of?

Epoxy based polymer coating over electro-zinc plating.

Can Backer-On Rock-On be used in 3/16 steel?

No, Backer-On Rock-On screws can be used in 26 to 22 light gauge steel.