Metal girders

Runs are designed to withstand the loads from the roof and transfer them to the design, which are located below - roof trusses, beams transverse frame frames and the like. To reinforce the joists supporting the roof elements. Runs work like a split or a continuous pattern of the beam. Purlins, are fixed to the cross - section of bond sites covering farm simultaneously play the role of bond spacers sensing longitudinal forces arising from the action of horizontal loads applied along the building.