Which type of construction typically has a flat roof and fire-resistant ratings?

Type 2 construction is characterized by non-combustible materials, meaning that the structural elements are made from materials that resist catching fire and do not contribute to the spread of flames. This construction type typically has fire-resistant ratings due to the use of materials such as concrete and steel, which can withstand fire for a specified period of time.

In addition, flat roofs are often found in Type 2 buildings, as these structures are designed to minimize fire risk while providing a functional design for things like commercial buildings and industrial facilities. The fire-resistant qualities are critical in ensuring the structural integrity of the building during a fire event and preventing rapid fire spread.

The other construction types differ significantly in terms of materials and fire ratings. Type 1 uses reinforced concrete and steel, providing the highest level of fire resistance, while Type 3 and Type 5 involve more combustible materials, leading to lower fire ratings and increased risk in fire scenarios. Thus, the defining characteristics of Type 2 construction align closely with the requirements of having a flat roof and fire-resistant ratings.