Roof systems are categorized into which three types?

Roof systems are categorized into low slope, steep slope, and hybrid systems based on the angle of the roof and the methods used for water drainage.

Low-slope roofs typically have a pitch of less than 3:12, which means the roof rises less than three inches for every twelve horizontal inches. These roofs often utilize materials such as built-up roofing or single-ply membranes that are effective in preventing water accumulation.

Steep-slope roofs, on the other hand, have a pitch greater than 3:12. This type of roof often uses materials like asphalt shingles, metal panels, or tiles, which are designed to allow water to run off efficiently.

Hybrid systems combine elements of both low slope and steep slope roofing. This categorization is crucial for determining the appropriate roofing materials and drainage practices, directly impacting the performance and longevity of the roof.

The other options do not classify roof systems based on their slope or drainage characteristics, leading to less relevant groupings in terms of roofing practices and materials. For example, categorizing by material type (like metal or shingle) does not address the functional aspects of water shedding which are critical in roofing.