![Metal Z-Purlins Design Based on AISI 2001 1 Metal Z Purlins Design Based on AISI 2001](https://excel.civilmdc.com/wp-content/uploads/2021/12/Metal-Z-Purlins-Design-Based-on-AISI-2001.png)
Z purlins or zed purlins are horizontal beams that are designed to form the roof and wall joists of a building shell structure (also view our C section purlins page). They sit between the roofing sheets and the building, acting as a support for the sheet to ensure it is firmly attached and safely in place.