Wind Zone Lookup
Check wind speed requirements for your area. Ensure your roofing materials meet local wind resistance codes and ASCE 7 standards.
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How Wind Zones Are Determined
Design Speed = Base Speed ± Exposure Adjustment
Wind zones are determined based on geographical location using ASCE 7-16 wind speed maps. Coastal areas and hurricane-prone regions have higher wind speeds than inland areas.
Exposure Adjustments:
- Exposure B (shielded): -5 mph
- Exposure C (open): No adjustment
- Exposure D (unobstructed): +10 mph
Nailing Requirements by Zone:
- Low (90-110 mph): 4 nails per shingle
- Moderate (115-130 mph): 5-6 nails per shingle
- High (135-150 mph): 6 nails, enhanced pattern
- Extreme (155+ mph): 6+ nails, high-wind pattern
Reference: ASCE 7-16 Chapter 26 - Wind Loads
Frequently Asked Questions
ASCE 7-16 is the American Society of Civil Engineers' standard for minimum design loads on buildings and other structures. Chapter 26 specifically addresses wind loads and provides the wind speed maps used for determining design requirements.
ASCE 7 defines three exposure categories:
Exposure B: Urban/suburban areas with many obstructions
Exposure C: Open terrain with scattered obstructions (default for most areas)
Exposure D: Flat, unobstructed areas like shorelines or grasslands
Exposure B: Urban/suburban areas with many obstructions
Exposure C: Open terrain with scattered obstructions (default for most areas)
Exposure D: Flat, unobstructed areas like shorelines or grasslands
Additional nails increase the wind uplift resistance of shingles. In high wind zones (120+ mph), standard 4-nail patterns may not provide adequate holding power. Enhanced patterns with 6 nails and specific placement help shingles resist lifting and blow-off during severe weather events.
Yes, metal roofing systems have different fastening requirements based on the panel type, clip spacing, and seam configuration. Standing seam metal roofs typically have excellent wind resistance when properly installed with manufacturer-approved clips and fasteners.
Miami-Dade County has the strictest building codes in the nation due to hurricane exposure. Products with a Notice of Acceptance (NOA) from Miami-Dade have passed rigorous testing for high-velocity hurricane zones (HVHZ). Many insurance companies and building departments require NOA products in hurricane-prone areas.
ASCE standards are updated approximately every 6 years (7-16, 7-22, etc.). However, local jurisdictions may adopt updates at different rates. Always check with your local building department for the specific code cycle and amendments in effect for your project.