Metal roof systems are designed to shed or channel water from the roof surface. The slope of the system is designed to prevent water remaining on the panels for an extended period of time. This limits the panel’s waterproofing requirements. The metal panels are rarely a source of moisture intrusion, unless there are openings from surface corrosion. Leaks in these systems predominantly occur at panel terminations and flashings. Therefore, it is important that the design and installation of the materials at these vulnerable points are properly completed.

Digital Edition - Best Practices (pg 22)

Metal roof systems are designed to shed or channel water from the roof surface. The slope of the system is designed to prevent water remaining on the panels for an extended period of time. This limits the panel’s waterproofing requirements. The metal panels are rarely a source of moisture intrusion, unless there are openings from surface corrosion. Leaks in these systems predominantly occur at panel terminations and flashings. Therefore, it is important that the design and installation of the materials at these vulnerable points are properly completed.

Digital Edition - Best Practices (pg 22)