Where the numbers come from
Edge wind pressure on a low-slope roof is worked out from ASCE 7, the structural loads standard.
The Design Center uses ASCE 7-16 Chapter 30, components and cladding, for buildings up to 60 ft mean roof height.
Sources
- ASCE/SEI 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures - American Society of Civil Engineers
- Design Center wind uplift & edge screening method - Architectural Flashing Supply