What is a weakness of Type 4 construction?

A significant weakness of Type 4 construction is the high risk of outside fire spread. This type of construction typically utilizes heavy timber or wood-frame elements, which can burn very well and allow fire to spread rapidly from the exterior, especially in situations where materials used for siding or roofing are flammable.

In Type 4 structures, which often have large, open areas and less fire-resistant protections in the exterior, an external fire can easily penetrate the building and compromise its integrity. This is particularly concerning in scenarios where combustible materials are within reach of potential external fire sources, leading to a higher likelihood of ignition and spreading.

By understanding this characteristic, firefighters can develop strategies to mitigate risks associated with fire spread in Type 4 construction, ensuring a more effective response during fire incidents.