1. TRADA trusses
TRADA trusses may look complicated but if you run through this sequence a couple of times the construction should be easier to understand.

2. . TRADA trusses Strapped or bolted joints
The truss is made from from a series of individual components. They are not as big as traditional trusses and are mostly found in 1950s houses.

3. The truss spans from wall plate to wall plate
The truss spans from wall plate to wall plate. The trusses are typically 2.4 metres apart

4. Once the trusses are in position the ridge board and purlins can be fixed.

6. Notice that the purlins do not sit on the truss but ‘within’ it
Notice that the purlins do not sit on the truss but ‘within’ it. This ensures that the rafter line is flush with the top of the truss.

7. The rafters are supported mid span by the purlins
The rafters are supported mid span by the purlins. The joists span from plate to plate with additional possible support from internal load-bearing walls.
End