Class 1 A single dwelling being a detached house, town house or one or more attached dwellings, each being a building separated by a fire resisting wall including a row houses, terrace, town house or villa unit.
Class 2 A building containing 2 or more sole occupancy each being a separate dwelling.
Class 3 A residential building other than a building of Class 1 or 2.
Class 4 A dwelling in a building that is Class 5, 6, 7, 8 or 9, if it is the only dwelling in the building.
Class 5 An office building used for professional or commercial purposes.
Class 6 A shop or other building for the sale of goods by retail or the supply of services direct to the public.
Class 7 A carpark or storage or display of goods or produce for sale by wholesale.
Class 8 A laboratory or a building in which a handicraft or process for the production, assembling, altering, repairing, packing, finishing or cleaning of goods or produce is carried on for trade, sale or gain.
Class 9 A building of a public nature.
Class 10 A non-habitable building or structure.
Apex The connection region between two top chords.
Bridge truss This truss can be either a common or truncated truss. With overhang removed at heel. A bridge bracket is fitted to one or both of the cut off ends.
Chord Structural member that forms the top and bottom component of a truss.
Common truss Framed truss supported on both ends by load bearing walls. It forms the main roof block and gable ends. This is also known as a standard truss.