Barrel roofs are generally Employed in the look of factories together with other industrial buildings that go over substantial sections of land. They are sometimes made of metallic but can be made from common asphalt shingles. commercial - of or referring to commercialism; "a commercial attache"; "commercial paper"; "commercial legislation" https://webchewy.com/finding-the-right-commercial-roofing-services-in-chicago-expert-tips-for-business-owners/