What is the slope percentage indicating a low sloped roof?

The slope percentage that indicates a low sloped roof generally refers to the ratio of vertical rise to horizontal run. For most roofing standards, a low sloped roof is defined as having a slope of 2/12 or less. This means the roof rises 2 inches for every 12 inches of horizontal run.

The range specified in the choice that includes 2/12 thus effectively encompasses roofs that are typically classified as low sloped. A slope below this range usually signifies a roof that is better suited for materials designed to handle lower water drainage situations, such as built-up roofing or single-ply membranes.

Understanding the slope percentage is crucial for selecting appropriate roofing materials and ensuring effective water drainage, which prevents water pooling and subsequent leaks or structural damage. Roofs with greater slopes, such as those in the range of 4/12 and up, are not classified as low sloped and typically require different considerations regarding materials and construction methods.