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Installing metal roof purlins is a crucial step in constructing a metal roof. Purlins are horizontal beams that provide structural support for the roof panels. Here are the basic steps to install metal roof purlins:
1. Measure and mark the locations for the purlins on the roof trusses or rafters.
2. Secure the purlins to the trusses using screws or nails, ensuring they are level and evenly spaced.
3. Attach the purlins securely, making sure they are properly aligned and flush with the trusses.
4. Install additional purlins as needed, depending on the size and weight of the roof panels.
5. Check the alignment and stability of the purlins before proceeding with the installation of the roof panels.
By following these steps, you can successfully install metal roof purlins and create a strong and durable roof structure.
Metal roof purlins are placed horizontally beneath metal roofs. They are positioned on top of the roof rafters, with a felt underlayment or vapor barrier on top. Purlins, measuring 2 by 4 feet, are installed in a similar manner as metal roofing. They provide additional support to the roof and serve as a surface for attaching the end panels and drip edge.
Step 1
Measure the roof rafters from end to end to determine the number of purlins required for installation. Record the dimensions of the roof’s width and height.
Step 2
Draw a horizontal chalk line across the roof, two feet below the top edge. Begin laying the first purlin at either corner, extending it from the ridge of the roof down to the chalk line. Secure the purlin to each vertical rafter using 16d common nails. Place two equally spaced nails into each rafter. The rafters are typically spaced at 16 inches on center.
Step 3
Position the second purlin horizontally right next to the first one and install it in the same manner. Continue this process until the first row is complete. If necessary, use tin snips to cut the last purlin to the appropriate size.
Step 4
Move two feet down the roof and snap another horizontal chalk line. Install the second row of purlins following the same steps as the first row, cutting the end piece to fit if needed. Repeat this process, snapping additional chalk lines every two feet, until the entire roof is covered with purlins. Inspect the area to ensure that no nails are protruding and that all purlins are securely attached to the rafters.
