 |
||||||||
 |
Profile | Details | Specification | Performance | Finishes | Retrofit | Projects | Contact Us | |||||||
|
|
||||||||
 |
||||||||
| Metal Roofing Wind Uplift Requirements | ||||||||
|
|
||||||||
Mode of Failure |
 |
|||||||
| The two key elements that the UL test and theoretical calculations were unable to address were cross-wise deformation of the panel under load, and subsequent sidelap disengagement of adjacent panels. When panels are put under a negative load, the center of the panel bows up, changing the section properties of the panels, and allowing the ribs to rotate and come unhooked from each other. The UL 580 test requires that the entire perimeter of the ten foot by ten foot test section be secured with through fasteners. This prevents panel deflection and does not allow the ribs to rotate as they would under an actual wind load. Testing using the ASTM E 1592 criteria has shown that mechanically seamed systems can withstand much higher wind uplift pressures than the “snap-together” systems. The reason for this is that the mechanically seamed systems have a much more positive panel to panel engagement, resulting in the ability to resist higher loads before sidelap disengagement occurs. | ||||||||
|
|
||||||||
|
Profile | Details | Specification | Performance | Finishes | Retrofit | Projects | Contact Us
Last updated: ©2000-2003 Architectural Metal Products |
||||||||