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I have 8 ft truss spacing, which tells me I need my purlins on edge. However, I'm wondering how much of a role pitch plays in setting my purlins on edge or not. I'll have a 7/12 pitch. I'm worried about my purlins rolling on edge with a steeper pitch. Thanks in advance for any input.

I am planning out the roof framing for my pole barn. Trusses will be spaced 8 ft apart. With that spacing I'm pretty sure purlins will need to be on edge and not laid flat. I'm wondering if it is ok for me to stagger the purlins in between the rafters and screw through the rafter and into each...