Beyond only supporting the roof, purlins also serve as a structural support for the roof deck of your building. This support is provided by their horizontal "diaphragm," which endures weight loads regardless of the material used for the roof's surface. They also contribute to the overall strength of your roof. The structural girts and purlins that industrial buildings, garages, and wa... https://www.maxroof.in/pre-engineered-building.html