Take the interior trim off your roof vent, you can then determine the amount of attic space, possibly the thickness of the roof decking & choosing screw length from your exact needs.
If guessing a length of between 1" to 1 1/4" wouldn't be an issue.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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