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Roof and Trussed Rafter Bracing
Bracing in trussed rafter roofs is essential and performs specific and separate functions:
 
1. TEMPORARY BRACING
Temporary bracing is required during erection of the trussed rafters to ensure that the trusses are erected vertically plumb, at the correct centres and in a stable condition for the continuation of construction.  This bracing is the responsibility of the roof erector, (see later for recommendations).
2. TRUSS INTEGRITY BRACING
 
Bracing may be required by the trussed rafter design to prevent out-of-plane buckling of a member or members within the truss. This bracing must be provided to ensure the structural integrity of the trussed rafter. It is the responsibility of the Trussed Rafter Designer to inform the building designer if this is required.  See figure 26a, 26b and 26c.
 
 
3. ROOF STABILITY BRACING
In addition to the above bracing, extra bracing will often be required to withstand external and internal wind forces on the walls and roof. This area of bracing design is the responsibility of the Building Designer (or Roof Designer if one has been appointed) and includes such areas as diagonal wind bracing, chevron bracing to internal members, longitudinal bracing at truss note points, etc.