When installing a new roof system in a hurricane zone on Maui, what is the maximum allowable spacing for roof sheathing fasteners along panel edges?
Correct Answer
C) 6 inches on center
In hurricane zones, roof sheathing fasteners must be spaced no more than 6 inches on center along panel edges to provide adequate resistance to wind uplift forces.
Why This Is the Correct Answer
6 inches on center is the maximum allowable fastener spacing along panel edges in Hawaii's hurricane zones. Closer fastener spacing along edges resists the uplift and shear forces generated by hurricane-force winds, preventing roof sheathing from being torn away from the framing.
Why the Other Options Are Wrong
Option A: 8 inches on center
8 inches on center exceeds the maximum allowable edge spacing for hurricane zones. This spacing would be too wide to adequately resist wind uplift forces acting on the panel edges during a hurricane.
Option B: 4 inches on center
4 inches on center is more restrictive than the required maximum — meaning it exceeds the minimum standard — but it is not the maximum allowable spacing. While using 4-inch spacing is acceptable, it is not what the code specifies as the upper limit.
Option D: 12 inches on center
12 inches on center is the typical field (interior) fastener spacing for standard construction, not the edge spacing for hurricane zones. Using 12-inch edge spacing in a hurricane zone would be a serious code violation and safety hazard.
Memory Technique
Remember '6 on the edge in hurricane hedge' — when you're on the edge (panel perimeter) in a hurricane zone, 6 inches is your maximum spacing to hedge against wind damage.
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