1. A standard screwgun with a depth sensitive nosepiece should be used to install cement board
fasteners. For optimal fastener performance, use a screwgun with adjustable depth of drive
and variable RPM (0-2000).
2. Adjust the screwgun nosepiece to properly seat the fastener.
3. Use enclosed T-25 Star Drive bit to drive in the cement board – worn or damaged bit tips should
be replaced.
4. The fastener is fully seated when the head is flush with the work surface.
5. Overdrivng may result in torsional failure of the fastener or stripout of the substrate.
6. Steel stud attachment – Fastener must penetrate a minimum 3/8″ beyond steel for optimal
performance”
7. Wood stud attachment – Fastener must penetrate 1″ info wood stud or beyond plywood for
optimal performance”
Q: Can Rock-On Backer-On screws go through steel studs?
Yes, Rock-On Backer-On screws can be used in 26 to 22 light gauge steel.
Q: Are Rock-On Backer-On screws approved for use in treated lumber?
No, Rock-On Backer-On screws are not approved for use in treated lumber.
Q: Are Rock-On Backer-On Screw ACQ approved?
No, Rock-On Backer-On screws are not approved for ACQ.
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. 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.
Q: Can Rock-On Backer-On screws be used on Hardiplank?
No, Rock-On Backer-On screws are not approved for exterior applications.
Q: What is the Climaseal coating made of?
Epoxy based polymer coating over electro-zinc plating.
