This is a very important question. Residential roofing is different from commercial roofing because the products and processes that are involved are quite different. Residential roofs are typically sloped, and the roofing materials that are used for homes vary from asphalt shingles to metal roof panels, to tile. For commercial applications, single-ply roofing materials are usually brought to the conversation, as well as commercial roofing products such as TPO.