Final answer:
Light Noncombustible (ISO Class 3, IBC Type IIB) refers to a category of noncombustible building construction materials that do not fuel a fire, commonly used in the building's structural framework to enhance fire resistance.
Step-by-step explanation:
The term Light Noncombustible (ISO Class 3, IBC Type IIB) refers to a type of building construction material. This classification indicates that the construction materials used in the building are noncombustible, meaning they do not contribute fuel to a fire. Examples of noncombustible materials include metals and concrete. Such materials are typically used in the structural framework of the building and can provide a higher level of fire resistance. This category of materials is essential for limiting the spread of fires and providing a structure that can remain stable longer under fire conditions. The International Building Code (IBC) and Insurance Services Office (ISO) use this classification along with others to rate the quality and durability of construction methods with regard to fire safety.