I'm researching how to expand an existing coop/run setup by attaching an 8'x10' roofed run. It's the roof purlins, joists, trusses, whatever all those pieces are that hold the metal onto the structure that have my head swirling. Thanks to all the BYC'ers over all the years who took time to post photos and descriptions of all phases of their construction projects. I'm finding this forum very helpful. A picture is worth a thousand words!