Composite Joist ~ a type of lattice frame, constructed from a pair
of parallel and opposing stress graded softwood timber flanges,
separated and jointed with a web of V shaped galvanised steel
plate connectors. Manufacture is off-site in a factory quality
controlled situation. Here, joists can be made in standard or
specific lengths to order. Depending on loading, spans to about 8 m
are possible at joist spacing up to 600 mm.
Advantages over solid timber joists:
Large span to depth ratio.
High strength to weight ratio.
Alternative applications, including roof members, purlins, etc.
Generous space for services without holing or notching.
Minimal movement and shrinkage.
Wide flanges provide large bearing area for decking and ceiling
board.Steel Web Lattice Joist