What type of materials does flame spread rating apply to?

Flame spread rating specifically applies to interior building materials and finishes, which are crucial in assessing fire safety within buildings, particularly in high-rise structures. The rating helps to determine how quickly flames can travel across a material's surface when exposed to ignition. This is particularly important for materials used in walls, ceilings, flooring, and other interior finishes, as it directly impacts the spread of a fire and the risk to occupants.

Understanding flame spread ratings aids in compliance with building codes and safety regulations, which are designed to minimize fire hazards and protect lives. By focusing on interior materials, this rating provides critical information that helps architects, builders, and safety directors in selecting appropriate materials that meet safety standards and reduce the likelihood of rapid fire spread in occupied spaces.