Purlins are cold roll formed Z profile, mainly 200 to 250 mm deep out of 1.6 to 2.5 mm thick sheet(245pa/345Mpa).They are fixed to the rafters of the primary structure and due to the overlaps between the purlins on the rafter act as continous bams.Eave purlins can be C profiles or Z profiles.Connections are made using galvanised bolts.
Wall GritsGrirts are in cold roll in C or Z formed shape 200 to 250 mm deep out of 2.0 to 3.15 mm thick steel.There are two types of fixations.Continous with overlaps adjecent to the main frame columns, the connections being made using galvanized bolts directly into the columns flanges.