Calculate the required roof sheathing thickness for a hurricane zone with 160 mph winds and 24-inch rafter spacing.
Correct Answer
A) 3/4 inch OSB
160 mph wind zones with 24-inch rafter spacing require minimum 3/4 inch OSB sheathing to resist the high wind loads and provide adequate structural support.
Why This Is the Correct Answer
At 160 mph design wind speeds with 24-inch rafter spacing, the high wind uplift forces require 3/4-inch OSB sheathing. This thickness provides the panel stiffness and nail-withdrawal resistance needed to keep the roof deck intact under extreme wind loads.
Why the Other Options Are Wrong
Option B: 7/8 inch OSB
7/8-inch OSB exceeds the minimum required thickness and is not a standard sheathing dimension used in residential construction. It would be over-specified.
Option C: 1/2 inch OSB
1/2-inch OSB is adequate for standard residential construction in low-wind areas but is insufficient for 160 mph hurricane zones with 24-inch rafter spacing. The panels would be prone to deflection and fastener pullout.
Option D: 5/8 inch OSB
5/8-inch OSB is commonly used in high-wind areas and would be adequate for moderate hurricane zones, but 160 mph winds with 24-inch spacing require the additional strength of 3/4-inch panels.
Memory Technique
160 mph + 24-inch spacing = go up to 3/4. Think: extreme wind + wide spacing = maximum common sheathing thickness (3/4 inch).
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