This publication covers the construction of residential decks suitable for weather-exposed applications with timber decking boards to timber sub-frames and either timber or steel posts. With this class of building the deck is designed for a uniformly distributed load of 2.0 kPa, a point load of 1.5kN and line loads. In addition to this the mass of decking supported by the framing is limited to 20kg/m2. In situations where treated timber (including CCA, ACQ and Copper azole) remains at more than 20% moisture content for extended periods these applications require greater consideration of the treatment level, fixings and fasteners used in such environments. It should also be noted that local government authorities generally have specific requirements relating to deck construction that must be adhered to, including building approval. The need for building approval relates to aspects such as the size of the deck, its elevation above ground and whether the deck is attached to the dwelling.