Shingles or Metal Sheeting
Most residential and many commercial roofs use either asphalt shingles or metal sheets as the exterior layer. This layer is the most prone to damage, so it’s a good idea to perform a visual inspection periodically to ensure there are no missing shingles, signs of rust on metal, or other hazards. Typically, asphalt shingles last around 15-20 years and metal roofing lasts as long as 50-75 years.