Graphical Construction Glossary >> Roofs and roofing. >> Roof Framing >> Roof battens
Above a 75 x 50 roof-batten/purlin fixed with a purlin strap. The straps are typically one per connection but alternate on either side of the rafter. In most cases these straps are hidden in the roof space, but where the fixing is seen top hat straps are used unlike the one shown here.
The rolled formed metal roof battens have many advantages over timber, provided of course that they are suitable for the type of roofing being fixed to them.
Regarding the metal ceiling battens. If the internal walls are framed, That is not brickwork or masonry, then it is normal to make them lower by the thickness of the ceiling batten. This allows continuous lengths of battens to span over the walls saving on extra ceiling joists and trimmers around the walls as in standard construction.
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