Which roofing type is both lightweight and noncombustible?

Which roofing type is both lightweight and noncombustible?

• A. Clay tile
• B. Metal roof
• C. Wood shake shingles
• D. Composite shingle

Answer: (B)

Metal roofing stands out because it combines light weight with noncombustibility. It’s much lighter than traditional clay tile or concrete, which puts less stress on the structure and can simplify installation. At the same time, metal materials such as steel or aluminum don’t burn and often carry high fire ratings, making them a reliable noncombustible option. Clay tile, while noncombustible, is heavy and adds significant load, which is a drawback for weight. Wood shake shingles burn easily, so they aren’t noncombustible. Composite shingles vary, but many are asphalt-based and not reliably noncombustible. So, metal roofing best meets both criteria.

Metal roofing stands out because it combines light weight with noncombustibility. It’s much lighter than traditional clay tile or concrete, which puts less stress on the structure and can simplify installation. At the same time, metal materials such as steel or aluminum don’t burn and often carry high fire ratings, making them a reliable noncombustible option. Clay tile, while noncombustible, is heavy and adds significant load, which is a drawback for weight. Wood shake shingles burn easily, so they aren’t noncombustible. Composite shingles vary, but many are asphalt-based and not reliably noncombustible. So, metal roofing best meets both criteria.