Residential roofing involves individual homes with roofs that are usually steep-sloped and made from asphalt, tile, or metal shingles. Some homeowners also opt for slate or wood shake. Commercial roofing involves businesses or industries and most roofs are flat roofs, often composed of single-ply materials like PVC, TPO or EPDM. Some commercial buildings, however, use metal or even asphalt shingles. Commercial roofs are also usually much larger than those on homes.