What percentage slope is defined as a steep-slope roof system?

A steep-slope roof system is typically defined as one that has a slope of 25% or greater. This figure reflects the degree of inclination measured as a percentage, which corresponds to a rise of 25 units for every 100 units of horizontal run. Roofs with this degree of steepness are particularly important in roofing practices because they allow for adequate water runoff, reducing the risk of water pooling and potential leaks.

Understanding the different classifications of roof systems based on slope is critical for roofing contractors, as it impacts material selection, installation techniques, and structural considerations. The correct identification of steep-slope roofs is essential in ensuring compliance with building codes and best practices in roofing design. Lower percentages listed in other choices do not meet the criteria for what is considered steep-slope.