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STRUCTURAL STEEL » PURLINS & GIRTS » Cladding |
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Structural Products PDF  
CladdingA 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 pre-assembled seals. In non-cyclonic areas, fixing may be through the crests or valleys of the sheets. On roofs, valley-fixing introduces some risk of leakage, but on walls it is the usual practice. Check with BlueScope Steel or your sheeting manufacturer/supplier for the recommended fixing method for the sheeting product you’re using. In cyclonic areas, some claddings should only be crest-fixed. With the 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 around the screw heads. (Again, check with BlueScope Steel or your sheeting supplier on the appropriate fixing method.) The secret-fixed decks 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. This may not apply to metals or brittle sheeting materials. Online Enquiry |
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