What is considered an ordinary hazard in structural firefighting?

In structural firefighting, an ordinary hazard refers to materials and situations that are commonly found in residential and commercial buildings and have a typical level of combustibility. Everyday materials such as paper and wood products fit this definition as they are prevalent in most structures and can ignite easily when exposed to a heat source.

These materials are often found in furnishings, building frames, and decorative elements, making them a significant concern for firefighters. Understanding what constitutes an ordinary hazard helps firefighters assess risk levels effectively and develop strategies for combating fires commonly associated with these materials. While specialized equipment, highly flammable chemicals, and low-quality building materials can present unique challenges, they do not represent the everyday risk that ordinary hazards like paper and wood products pose in typical firefighting scenarios.