Florida Building Code Practice Exam

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

1. 1/4 in 12

2. 1 in 12

3. 3 in 12

4. 4 in 12

The correct answer is: 3 in 12

The minimum slope for lapped, non-soldered seam metal roofs without applied lap sealant is indeed 3 inches in 12 inches of horizontal run. This requirement is established to ensure proper water drainage and to minimize the risk of water infiltration through the seams of the roofing material. At a slope of 3 in 12, the roofing system allows for adequate runoff of water, which is critical in preventing ponding or standing water that could lead to leaks or structural damage over time. Additionally, this slope facilitates the natural shedding of water, thereby reducing the likelihood of debris accumulation that might obstruct drainage paths. Lower slopes, such as 1/4 in 12 or 1 in 12, would not provide sufficient drainage, increasing the potential for water-related issues like leaks and rust, especially given that non-soldered seams are more prone to failure without an applied sealant. A steeper slope, such as 4 in 12, could exceed the minimum requirement but is not necessarily the standard for all situations, which is why 3 in 12 is designated as the minimum in this context.