What type of construction uses materials that do not sustain combustion?

Type 1 construction, also known as fire-resistant or non-combustible construction, employs materials that can withstand high temperatures without sustaining combustion. This type of construction typically utilizes steel and reinforced concrete, which are designed to resist fire and prevent its spread. This characteristic makes Type 1 construction the most suitable for buildings where fire safety is a top priority, such as high-rises and critical infrastructure.

The other types of construction (Types 2, 3, 4, and 5) incorporate materials that may be less resistant to fire. For instance, Type 3 construction often involves a combination of combustible and non-combustible materials, whereas Types 4 and 5 use larger amounts of combustible materials, such as wood framing. This differentiation in material composition defines the respective fire resistance levels and safety features of each construction type, with Type 1 standing out for its superior fire-resilient properties.