What defines a low slope roof?

A low slope roof is typically defined as having a pitch or slope that is less than 3:12, which translates to approximately 14 degrees. This means that for every 12 horizontal units, the roof rises less than 3 vertical units. Roofs with this low slope are designed for various roofing materials and drainage considerations, as they may not allow for the same water runoff as steeper roofs.

When considering the other options, a roof with a slope of less than 10 degrees is indeed low, but 14 degrees is the upper limit of what is generally classified as a low slope. A pitch of 15 degrees or more is usually categorized as a steep slope roof, as this is where more effective drainage and roof material options begin to change. Similarly, a roof with a slope of more than 20 degrees would also be classified as steep slope due to the significant rise. Understanding the classification of roof slopes is crucial for determining appropriate roofing materials, methods of installation, and drainage strategies.