Refers to asphalt roofing material composed of an organic felt or fiberglass mat, saturated with asphalt, and faced with stone aggregate, and supplied in 36-inch wide rolls with 108 square feet of material. Weights are generally 45 to 90 pounds per roll. Inexpensive and commonly used on sloped roofs in North America.
roll roofing (Wikipedia)
Roofers applying commercial grade "torch-applied" modified bitumen roll roofing.
Asphalt roll roofing or membrane is a roofing material commonly used for buildings that feature a low sloped roof pitch in North America. The material is based on the same materials used in asphalt shingles; an organic felt or fiberglass mat, saturated with asphalt, and faced with granular stone aggregate.