Construction Systems
Deck structures usually involve posts or piles that support bearers, joists and decking.

Two systems are commonly used. The first uses a single bearer housed into the pole or pile. The second uses a double headstock system utilising thinner bearers housed into opposite sides of the pole or pile. This method does not require extra bolts and reduces the depth of the rebating. Refer to Figure 1.

Wide decking boards (e.g. greater than 120mm) are commonly used to reduce rattles and improve vehicle ride. Boards laid with a slight diagonal set-out will also help to distribute wheel loads across multiple boards.

The need for handrail and kerbing is dependent on usage requirements, height above ground and type of traffic. For assistance with handrail design, refer to the application guide on Stairs, Handrails and Balustrades - as referenced at the end of this document. Kerbing design requirements emphasise vertical loads and should be determined by a structural engineer – a 75 x 75mm cross-sectional area is the minimum kerb recommended.