Which roofing material is NOT typically used for steep-slope roofs?

Steep-slope roofs are typically characterized by their angles of inclination, which generally exceed 3:12 (3 inches of vertical rise for every 12 inches of horizontal run). Roofing materials suitable for steep-slope applications must be able to shed water effectively to prevent leaks.

Flat roofing, on the other hand, is specifically designed for low-slope roofs—those with a pitch of 3:12 or less. The materials used for flat roofs differ significantly from those used on steep slopes because they are engineered to handle pooling water and are often applied in layers to create proper drainage. While they can include materials like built-up roofing (BUR) and single-ply membranes, these are not appropriate for steep-slope applications where the main concern is the rapid drainage of rainwater.

The other materials listed, such as asphalt shingles, tile, and metal, are commonly used on steep-slope roofs. They are designed to ensure effective water runoff and are generally installed in a way that allows for proper ventilation and weather resistance, making them ideal choices for this type of roofing.