BATTENS: Small-section timber members (See SANS 1783-4) spanning between trusses, connected to the top of the trusses’ top chords, and usually supporting a roof covering of tiles or slates (see Figure 5).
BATTEN SPACING or BATTEN CENTRES: Space between the centre lines of adjacent battens.
BRACING: Timber members placed perpendicular or diagonally between trusses to prevent movement due to lateral forces (such as wind) or buckling forces due to compression. Rules for bracing are given in SANS 10243: “The Design, Manufacture and Erection of Timber Roof Trusses”, and in the “Roof Erectors Handbook”, volumes one and two, published by the Institute for Timber Construction.
BRANDERING: Small-section timber members (see SANS 1783-4) connected to the underside of the bottom chord and used to support a fixed ceiling (see Figure 4).
LATERAL BRACE: A member placed and connected at right angles to top or bottom chords or web member of a truss.
PURLINS: Horizontal timber members spanning between trusses, connected to the top of the top chords, and usually supporting a roof covering of sheeting (see Figure 4).
PURLIN SPACING or PURLIN CENTRES: Space between the centre lines of adjacent purlins(see Figure 6).
RUNNER or BINDER: Continuous bracing member that runs the length of the roof to provide lateral stability for web members or chords of trusses in conjunction with triangulated cross- bracing (see Figures 4 and 5).
WALL PLATES: Timber members, usually 38 x 76 or 38 x 114 S.A. Pine, laid flat on top of the load bearing walls. The roof trusses are placed in their vertical positions on top of the wall plates, which assist in spreading the roof loading evenly over the brickwork (see Figures 4 and 5).