What materials are used in Class 3 construction?

In Class 3 construction, the primary focus is on structures built using non-combustible materials, which typically include elements such as metal and, in some historical contexts, asbestos. This classification is important because it signifies a higher level of fire resistance and safety. Non-combustible materials do not ignite easily and can withstand high temperatures without contributing to the spread of fire, making them ideal for commercial and industrial buildings where fire safety is a significant concern.

The inclusion of materials like metal aligns with building codes designed to ensure that structures can resist fire, enhance durability, and improve overall safety during emergencies. This classification often applies to warehouses, factories, and other facilities where fire hazards may be prevalent.

Other materials listed in the choices do not align with the definition of Class 3 construction. For example, wood, while commonly used in construction, is considered combustible and therefore does not meet the criteria for this classification. Similarly, the options mentioning all wooden structures or concrete only do not capture the requirement for non-combustible materials that define Class 3 construction.