In Australian commercial construction projects, a joist refers to a horizontal structural member that spans an open space and supports the floor or ceiling above. Joists are typically made of wood, steel, or concrete and are used to distribute the weight of the floor or ceiling and any loads applied to it, such as furniture, people, or equipment.

Joists are installed in a series, with each joist spaced at regular intervals along the length of the floor or ceiling. They are supported at each end by beams or walls and are connected to these supports using hangers or other connectors.

The size and spacing of joists in a commercial construction project will depend on several factors, including the span of the joists, the weight of the floor or ceiling, and the loads that will be applied to it. Engineers and architects will typically design the joist system to ensure that it is strong enough to support the required loads and meet the necessary building codes and standards.

In addition to providing structural support, joists also play a role in determining the overall appearance and functionality of a commercial building. The spacing and layout of joists can affect the appearance of the floor or ceiling and may also impact the installation of electrical, plumbing, and other building systems.

Requirements for Joists in Australian Commercial Construction

The Australian building code mandates that all floor bearers and joists meet specific requirements in terms of their size, material, spacing, and installation . The guiding code for timber framing in both residential and commercial buildings is AS1684.2, which serves as a blueprint for ensuring structural safety