What type of roofing is designed to be used at slopes as low as 1-in-12?

Double-coverage roll roofing is designed for low-slope applications, such as those with a pitch as low as 1-in-12. This type of roofing consists of sheets that are installed in a way that allows one sheet to overlap the other, providing additional protection against water infiltration, which is critical for roofs with minimal slope. The overlapping design helps to ensure that water drains off effectively, reducing the likelihood of leaks compared to other roofing types that may not be suitable for such low slopes.

In contrast, single-coverage roll roofing is generally used on steeper slopes and may not provide sufficient protection against ponding water on low slopes. While metal roofing can be used on low-slope roofs, it is typically recommended for steeper pitches unless a specific low-slope system is employed. Flat roofing, though applicable to low slopes, is usually a term used for roofs with a pitch less than 1-in-12, and can also involve different materials and installation techniques not ideal for the specified pitch.