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Introduction

Photo of a stack of roof trusses resting on top of the frame of a house.
Roof trusses, ready to be erected,
craned onto the frame

Roof bracing stabilises the three-dimensional roof structure. It also transfers forces down to the structure below. There are four types of roof truss bracing and these are described in AS 4440. They are:

  • lateral restraint to prevent buckling of top chords
  • diagonal bracing of top chords to stabilise roof planes
  • lateral restraint to prevent buckling of bottom chords
  • web ties.