Roof truss bracing guide
The following information is supplied in good faith but without liability.
Stability of the overall structure remains the responsibility of the building
designer.
Standard stability bracing - Duo pitched trussed rafters

Chevron bracing is only required for trusses with a span greater
than 8
metres. Rafter diagonal bracing should ideally be installed at 45deg but not
less than 35deg or greater than 50deg.