What is the minimum slope requirement for metal shingles?

The minimum slope requirement of 3:12 for metal shingles is based on industry standards that ensure proper water drainage and avoid issues related to leaks. A slope of 3:12 means that for every 12 horizontal inches, the roof rises at least 3 inches. This pitch is generally accepted to ensure that water runs off effectively, preventing standing water, which can lead to premature deterioration of the roofing material and potential leaks.

In various building codes and guidelines, the 3:12 slope is considered the baseline for metal roofing applications to maintain structural integrity and promote longevity. It balances the need for effective drainage with the practicalities of installation and aesthetic considerations. Roofs with a slope lesser than this may not shed water adequately, increasing the risk of water intrusion and other related issues.

In contrast, slopes that are steeper, such as the options of 4:12, 2:12, and 1:12, either exceed the minimum requirement or do not adequately meet the standards for metal roofing. A slope of 4:12 is even better for drainage, while 2:12 and 1:12 are insufficient for effective water runoff, leading to the risk of leaks and other roofing problems.