When installing a metal roof system in a hurricane zone, what is the maximum allowable spacing for roof deck fasteners along the perimeter edge?
Correct Answer
B) 6 inches on center
Hurricane-resistant roofing requires closer fastener spacing at perimeter edges where uplift forces are greatest. 6 inches on center is the maximum allowable spacing.
Why This Is the Correct Answer
Perimeter edges of a roof experience the highest wind uplift forces during a hurricane. Building codes for hurricane zones require fasteners at the perimeter to be spaced no more than 6 inches on center to prevent progressive edge failure and roof blow-off.
Why the Other Options Are Wrong
Option A: 12 inches on center
12 inches on center is the typical field (interior) zone spacing for standard construction. It is too wide for the perimeter edge in a hurricane zone where uplift forces are significantly greater.
Option C: 4 inches on center
4 inches on center is more restrictive than required. While tighter spacing provides more holding power, the code-specified maximum for perimeter edges is 6 inches — not 4. Using 4 inches is not wrong structurally but does not represent the maximum allowable spacing the question asks for.
Option D: 8 inches on center
8 inches on center is too wide for perimeter edge conditions in a hurricane zone. The increased uplift at edges demands closer spacing than the field zone.
Memory Technique
Remember 'perimeter = half the field.' If field spacing is 12 inches, perimeter in a hurricane zone is half that: 6 inches. The edge is where the storm tries to peel the roof first, so fasten it twice as tightly.
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