What components make up a roof assembly?

The roof assembly is fundamentally comprised of the roof deck and the roof system. The roof deck serves as the structural base that supports the entire roofing system, which includes various layers and materials designed to provide weather protection, thermal insulation, and waterproofing. The roof system encompasses all components placed above the deck, such as insulation, membranes, shingles, underlayment, and other protective elements. Understanding this relationship is crucial, as each part plays a role in ensuring the roof's overall performance and durability against environmental elements.

While insulation and ventilation, shingles and underlayment, and flashing and drainage systems are essential aspects of roofing, they each function as parts of the broader roof assembly. The roof deck and system provide the framework and critical components that collectively ensure the roof protects the building effectively. Recognizing this hierarchy helps roofing professionals design and maintain roofs that meet both building codes and performance standards.