For a hurricane-resistant roof system in Hawaii, what is the maximum allowable spacing for roof sheathing fasteners along panel edges?
Correct Answer
A) 6 inches on center
Hawaii Building Code requires 6-inch maximum spacing for fasteners along panel edges to ensure adequate uplift resistance in high wind conditions.
Why This Is the Correct Answer
Hawaii's Building Code mandates a maximum of 6 inches on center for fasteners along sheathing panel edges in hurricane-resistant designs. This tighter spacing increases the number of fasteners, distributing uplift forces across more connection points and significantly improving resistance to high-wind events common in Hawaii.
Why the Other Options Are Wrong
Option B: 8 inches on center
8 inches on center is a standard interior field spacing used in many mainland jurisdictions. It does not provide sufficient uplift resistance for Hawaii's hurricane exposure categories and would not meet Hawaii's edge fastening requirements.
Option C: 4 inches on center
4 inches on center is more restrictive than required and is sometimes used in extremely high-wind zones or for special structural panels, but it exceeds the code requirement. Choosing the most restrictive option is not the same as the maximum allowable spacing.
Option D: 12 inches on center
12 inches on center is a common field (interior) spacing for standard construction, not edge spacing in hurricane-resistant systems. Using 12 inches on panel edges would dangerously underperform in high-wind conditions.
Memory Technique
Edge = Exposed to the most force → needs the tightest control → 6 inches. Field = interior, sheltered → can be wider → 12 inches. 'Edges need 6, fields get 12.'
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