Chapter 15 addresses roof coverings and assemblies. Asphalt shingle roofing must meet wind rating standards, with higher ratings required in high-wind areas. Wood shake and shingle roofing must be treated for fire resistance. Metal roofing must be properly fastened to resist wind uplift. Tile and slate roofing is heavy and requires strong structural support. Membrane roofing (single-ply or built-up) requires proper sealing and fastening. Wind load resistance is verified through testing per ASTM D3161 or D6381. Impact resistance prevents damage from hail or debris. Fire ratings are tested per ASTM E108 or UL 790, with Class A, B, or C ratings. Roof drains and scuppers remove water, with overflow drains at 2 inches above the roof. Roof decking must be properly fastened and sized to resist loads. Roof slopes affect both drainage and snow load, with steeper slopes shedding snow and reducing load.