How Wind Uplift Affects Roof Systems
Wind uplift occurs when fast-moving air traveling over a roof reduces pressure right above the surface, creating suction that lifts the roof system away from the structure. These forces are typically strongest at roof edges and corners. For low-slope roof systems, this is why more fasteners are used in those areas than in the center (field) of the roof. For steep-slope roof systems, this is why a starter course is installed at the roof’s perimeter.
Roofs on taller structures experience higher wind speeds because the ground is not there to slow the wind down through surface friction.
To resist the effects of wind uplift, roof systems use fasteners, adhesives, and edge securement. Manufacturers assign wind ratings based on how well the roof assembly, not just the membrane
Material - A single-ply membrane is a roof coverin... More or shingles, resist these uplift forces. Higher wind ratings often require additional fasteners and reinforced perimeter details.