In areas of high wind, what is the maximum spacing for nailing underlayment?

In areas of high wind, what is the maximum spacing for nailing underlayment?

• A. 16 inches
• B. 36 inches
• C. 30 inches
• D. 24 inches

Answer: (B)

Wind uplift resistance for a weather barrier relies on fastening spacing. In areas with higher wind, codes and manufacturers allow a maximum distance between fasteners that still keeps the underlayment anchored to resist uplift across the sheet. The largest spacing permitted in these guidelines is 36 inches, which is why that option is the best choice. Tighter spacings (like 16, 24, or 30 inches) would be more labor-intensive but are not the maximum allowed; they’d only be used if a specific product or wind zone requires closer fastening. Always refer to the manufacturer’s installation instructions and local code requirements for the exact pattern.

Wind uplift resistance for a weather barrier relies on fastening spacing. In areas with higher wind, codes and manufacturers allow a maximum distance between fasteners that still keeps the underlayment anchored to resist uplift across the sheet. The largest spacing permitted in these guidelines is 36 inches, which is why that option is the best choice. Tighter spacings (like 16, 24, or 30 inches) would be more labor-intensive but are not the maximum allowed; they’d only be used if a specific product or wind zone requires closer fastening. Always refer to the manufacturer’s installation instructions and local code requirements for the exact pattern.