High Wind Systems
What makes a standing seam system high-wind rated?
Three modifications elevate a standard system to high-wind specification: tighter clip spacing in perimeter and corner zones, mechanical seam profiles instead of snap lock, and reinforced edge metal attachment at eaves and rakes. These modifications increase the assembly's tested wind uplift resistance.
How do wind zones affect clip spacing calculations?
The roof is divided into three wind zones: field (center), perimeter (edges), and corner. Corner zones experience the highest uplift pressures. The manufacturer's engineering tables specify different clip spacing for each zone based on the local design wind speed. High wind zones may require clips every 12 inches in corners versus 24 inches in the field.
Which Southern California areas require high-wind specifications?
Properties in Santa Ana wind corridors, hillside exposures, and coastal bluff locations face elevated wind loads. The design wind speed for each location is determined by ASCE 7 wind maps and local building code amendments. Our team calculates the specific wind uplift requirement for your property address before specifying the flashing and edge metal details.