Fastening methods for Roxul ComfortBoard IS
I was wondering if anyone has field tested Albert Rooks’ suggestion of using full thread (or broken thread) screws to get consistent screw compression on the strapping and prevent wavy siding. That sounds way simpler than cutting holes in Roxul / inserting sections of plastic pipe. One builder did not know about these options and ripped all the roxul off a side due to this issue. His Comfort Board was 1.5 inches thick I believe. I would like to put untreated strapping over 2″ comfort board then fiber cement siding.
I understand from previous articles that squash blocks are not necessary, but the research focused on deflection due to siding weight rather than the issue of inconsistent compression with fasteners. What are installers’s experience and advice?
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