a "rafter" refers to a structural component of a roof. Rafters are inclined beams that extend from the ridge or hip of the roof down to the wall plate, eave, or outer wall. They are an integral part of the roof framing system and are responsible for supporting the roof deck and its associated loads, such as roofing materials, insulation, and any additional weight from snow or maintenance activities.

Rafters are typically made from timber, steel, or engineered wood products, depending on the design requirements and materials used in the construction project. They are spaced at regular intervals and work in conjunction with other structural elements like purlins, trusses, and ceiling joists to provide stability and support for the roof structure.

In commercial construction, the design and installation of rafters must comply with relevant Australian building codes and standards, ensuring safety, durability, and performance of the roof system.