In addition to simple and continuous openings without overlapping, "Z" type purlins can also be used in overlapping openings in multi-coupled buildings. This is possible due to the difference between the two vertical sides of 4mm e.g. 70mm and 74mm. Overlapping spans result in increased system strength due to the double thickness at the support points.

"Z" shaped purlins are produced from high strength galvanised steel using cold rolling processes to provide a lightweight and cost effective support system for cladding and siding of metal framed buildings.

The "Z" purlins are produced in the dimensions and lengths of each order, starting from 2000mm. The maintenance is made according to the order with holes Φ14 and Φ18 with a shorter distance between the centres of the holes L=40mm.