Which of the following is a primary disadvantage of engineered lumber?

• A. They are heavier than lumber
• B. They burn faster than lumber
• C. They are more expensive
• D. They are immune to fire

Answer: (B)

Engineered lumber often has its main drawback in how it behaves in a fire. The resins and adhesives that bind the wood fibers can break down and ignite, and the uniform, dense composition can allow heat to penetrate quickly. As a result, once ignition starts, engineered lumber can burn more rapidly than solid lumber, making faster burning the key disadvantage here. The other points don’t apply universally: its weight isn’t inherently greater than solid lumber, it isn’t fireproof, and price varies by product and market rather than being a definitive drawback.