What is the minimum slope for lapped, non-soldered seam metal roofs without sealant?

The minimum slope for lapped, non-soldered seam metal roofs without sealant is 3 in 12. This requirement is based on the ability of the roof to effectively shed water and prevent issues such as leaks and water infiltration. At a slope of 3 in 12, the roof has sufficient angle to allow water to run off rather than pooling, which is crucial for maintaining the integrity of the roof system over time.

In this context, a slope of 3 in 12 translates to a rise of 3 inches for every 12 inches of horizontal run, which provides the necessary drainage characteristics. A slope that is too shallow, such as less than 3 in 12, may lead to inadequate drainage and increased risk of water accumulation, which can weaken the seams and lead to potential leakage.

Understanding the specifics of roofing materials and their installation requirements is critical for ensuring long-lasting performance and avoiding common roofing problems.