The next Saturday, my brother in law came over and we set 2x4 purlins over the trusses. The final overhang will be 2' all around, so we hung the 2x4's roughly 2' over the gable ends. The "rough" measurement would bite me later, but I'll get to that in another post.
One of my friends who's a contractor suggested that I place the purlin sections so they end between trusses rather than on top of a truss. Then just scab a 2 foot length of 2x4 to the bottom of both ends to tie them together. The logic is that the junction will be stronger because you're not nailing so close to the endgrain of the 2x4's. I did that, but I'm not sure if I'd do it that way again. The scabs were a pain to nail in, and I'm not convinced it's all that much stronger.
The trussed section of the barn is mostly done here and I'm ready to start setting the beams for the two shed roof sections.
