Befab LtdSag Bars provide an effective solution for restraining the purlin both during the cladding process and under wind uplift (reversal) conditions. The spring-loaded clip fixing system ensures that installation is quick and easy.

 

Anti-Sag Bars serve two main purposes: they prevent the purlin from twisting during erection, as the purlin gains significant stiffness from the roof membrane once the sheeting is fixed. Additionally, they provide lateral restraint to the bottom flange under uplift conditions.