Set Out
Before you begin moving the trusses onto the roof it is important to know where they are all going and more importantly that the top plates are square. The first trusses that need to be put in place are the truncated and girder trusses as they are crucial to the roof. Standard trusses are then set out as they can be all stood in the same motion.
Standing the Trusses
On a gable roof the first truss to be stood would be the gable truss witch is located over the end wall. On a hipped roof you start with the girder truss. As each other truss is stood and fixed at the heel, the truss is braced with a battern 3/4 of the way up the top chord, it helps to have the truss spacing marked on this battern.
Erection Tollerances
When leveling up the trusses and bracing with the bottom chord tie it is important to remember the rule of - the hieght of the truss / 50 is the max it can be out of level and the length of the bottom chord / 200 is the max it can be out.
Fixings and Connectors
Australian standards require that trusses are tied down using connectors. Many factors determine whitch on how many of these connectors must be used, these include, roof covering, truss spacing, wind classification and roof pitch. The connectors that can be used include such as, triple grips, L brackets, speed bracing, and cyclone ties.
