Define "flame spread rating."

Flame spread rating refers to a measurement of how quickly flames spread across a surface, which is crucial in fire safety assessments and building codes. This rating helps determine the fire performance of materials used in construction and furnishings. It is particularly important because materials that ignite and contribute to the rapid spread of fire can pose significant risks to life safety and property. The flame spread rating is often determined through standardized tests, where materials are subjected to controlled fire conditions to measure the time it takes for flames to spread over their surface. This helps builders, architects, and fire safety officials choose appropriate materials that meet safety standards to reduce potential fire hazards in structures.