What is the slope threshold that differentiates low slope and steep roofs?

The threshold that differentiates low slope roofs from steep roofs is a ratio of 4:12. This means that for every 12 horizontal inches, the roof rises 4 inches vertically. Roofs with a slope of this ratio or less are classified as low slope roofs, while those with a slope greater than 4:12 are considered steep roofs.

This distinction is significant for various reasons, such as the types of materials that can be used, drainage considerations, and potential safety measures that need to be taken for maintenance and repairs. Understanding this slope classification helps professionals in the construction and roofing industries determine the appropriate methods and materials for roof installation and maintenance based on the slope of the roof.