Windstorms can cause significant damage to roofs, making it essential to choose roofing materials and installation methods that offer superior wind resistance. Understanding the factors that contribute to wind damage and the available solutions can help homeowners protect their investment and ensure long-term safety.
Key Factors in Wind-Resistant Roofing:
Material Selection:
◦ Asphalt Shingles: Asphalt shingles are a popular choice for residential roofing, and many are designed to meet specific wind-resistant standards. Look for shingles that comply with ASTM D3161, UL2390/ASTM D6381, or ASTM D7158. These standards ensure that the shingles have been tested and proven to withstand certain wind speeds.
◦ Metal Roofing: Metal roofing is known for its puncture resistance and durability, with many standing-seam roof systems earning a Class 90 wind-uplift rating from Underwriters’ Laboratories, Inc. (UL).
◦ Single-Ply Roofing: Single-ply roofing is lightweight and easy to install. Some systems pass UL’s Class A fire rating and FM’s I-90 wind-resistance rating.
Installation Methods:
◦ Nailing: Proper nailing is crucial for securing shingles. It’s recommended to use properly driven and applied roofing nails. The quantity and placement of nails are also critical, especially in high-wind regions.
◦ Self-Sealing Shingles: Using self-sealing shingles with a factory-applied adhesive can increase wind resistance. The sun’s heat activates the thermoplastic sealant, bonding each shingle to the one below.
◦ Adhesives and Cements: Applying asphalt plastic cement under each tab of free-tab shingles can provide additional wind resistance. Be sure to cement all tabs throughout the roof.
◦ Hurricane Clips: In high-wind hazard areas, using hurricane clips can provide extra security for tiles.
Roof Design and Structure:
◦ Roof Slope: Roofs that include hips and/or valleys should have a steeper pitch than simple mono- or duo-pitch roofs.
◦ Underlayment: Self-adhering shingle underlayment protects against water infiltration from wind-driven rain.
Additional Considerations:
• Building Codes: Ensure that the selected roofing materials and installation methods comply with local building codes for wind resistance.
• Maintenance: Regular inspection and maintenance of the roof can help identify and address potential issues before they lead to significant wind damage.
• Professional Installation: Proper installation is critical for achieving the intended wind resistance of the roofing system.
Selecting a wind-resistant roofing system involves careful consideration of materials, installation techniques, and local building codes. By understanding these factors and working with qualified roofing professionals, homeowners can protect their homes from the damaging effects of windstorms and ensure long-term peace of mind.
