Cladding
A major benefit of cold formed purlins made from GALVASPAN® steel is the ease with which cladding can be fixed.
The relatively thin material of the purlin flange means that drilling and fixing is one simple operation, using self-drilling, self-tapping screws with preassembled seals.
Non-cyclonic Areas
In non-cyclonic areas, some claddings should only be crest fixed. With cyclic nature of the loading, thin hi-tensile claddings can fatigue quickly due to a lack of flexibility around the valley fixing. The sheeting fails by cracking round the screw heads. Again, check with BlueScope Steel or your sheeting supplier on the appropriate fixing method.
Secret-fixed Decks
These types of cladding are attached to clips screwed to the purlins. From a structural viewpoint, steel cladding properly fixed will always provide adequate lateral restraint for the top flange. However, the same cannot be said of other metals or brittle sheeting materials.
