Z Roof Purlins/ Wall Girts are cold rolled formed from steel with minimum yield strength of 345 mpa or 50,000 PSI. Z Roof Purlins are offered in a minimum 1.2mm and maximum 3mm thickness range. Z Roof Purlins/ Wall Girts act as struts that help in resisting part of the longitudinal loads that are applied on the building such as wind and earthquake loads. Z Roof Purlins/ Wall Girts provide lateral bracing to the compression flanges of the main frame members and increases frame capacity.