A: Hello - Thank you for your question. Backer-On screws can self-drill through cement board and do not require any pre-drilling.
A: For Durock backer board, we advise using our Rock-On fasteners. These are designed to fasten Durock backer board into wood framing. Unfortunately, they are not compatible with ACQ treated lumber.
A: Hi Ben, this is Ashley. Rock-On is for use in Durock cement boards and Backer-On is for use in Hardie Backer cement boards. If you have additional questions please call us at (877) 489-2726 or email us at CS@itwbrands.com
A: These fasteners are designed to be used for fastening cement board panels to studs. Please reach out to our customer service for more specific application-related questions.
|Name||#9 x 1-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (185-Pack)||#9 x 1-5/8 in. Serrated Flat Head Star Drive Cement Board Screws (140-Pack)||#9 x 2-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (100-Pack)||#9 x 1-1/4 in. Star Drive Serrated Head Cement Board Screws (185-Pack)|
|Screw Length||1-1/4 in||1-5/8 in||2-1/4 in||1-1/4 in|
|Features||Coated, Self Drilling, Self Tapping||Coated, Self Drilling, Self Tapping||Coated, Self Drilling, Self Tapping||Coated|
|Fastener Type||Cement Board||Cement Board||Cement Board||Cement Board|
|View Product||View Product||View Product||View Product|