Problems attributed to the bracing of timber roofs have necessitated a fresh
look at the bracing criterion given in the timber design code, SABS 0163 (1994).
The difference between bracing provided for stability of the overall structure and
bracing that is used to reduce the effective length of compression members is discussed.
The differences between bracing at discrete intervals and bracing by means
of a continuous elastic diaphragm are shown. Revised design rules are proposed,
which, if implemented, should solve the problems currently being experienced
with timber roofs.