A residential roof in Hawaii must resist a design wind speed of 130 mph. What is the minimum roof deck attachment requirement for 7/16-inch OSB sheathing?
Correct Answer
B) 8d nails at 4 inches on center at edges
For 130 mph design wind speeds, Hawaii requires 8d nails at 4-inch spacing along panel edges and 6-inch spacing in the field for 7/16-inch roof sheathing.
Why This Is the Correct Answer
For 130 mph design wind speed, the Hawaii Building Code requires 8d common nails at 4-inch spacing along panel edges and 6-inch spacing in the field (interior of the panel) for 7/16-inch OSB roof sheathing. This increased edge nailing (compared to standard 6-inch spacing) provides the uplift resistance needed in high-wind conditions. 8d nails (not 10d or 6d) are the specified fastener size for this sheathing thickness.
Why the Other Options Are Wrong
Option A: 10d nails at 4 inches on center at edges
10d nails are larger and stronger than 8d, but they are typically used for thicker sheathing. For 7/16-inch OSB, 10d nails can cause splitting and are not the specified fastener. Using larger nails than specified does not make the installation better — it can actually damage the sheathing panel edges.
Option C: 6d nails at 6 inches on center at edges
6d nails are too small for 130 mph wind design. 6d nails at 6-inch spacing is a standard schedule for low-wind areas, not suitable for Hawaii's high-wind requirements. The reduced withdrawal resistance of 6d nails would be inadequate for the uplift forces generated at 130 mph.
Option D: 8d nails at 6 inches on center throughout
8d nails are the correct size, but 6-inch spacing throughout (both edges and field) does not meet the 130 mph requirement. High-wind design requires tightened edge nailing (4 inches on center) because panel edges experience the highest uplift and racking forces. Uniform 6-inch spacing is a lower-wind-zone standard.
Memory Technique
For 130 mph Hawaii roofs: '8d nails, 4 at edges, 6 in field.' Think of it as 'close to the edge' — you need closer nailing (4 inches) at panel edges where wind uplift is greatest. The nail size 8d is standard for 7/16-inch OSB in high-wind zones.
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