Roof assembly using rafters, false tails, 2x4 purlins over, no sheathing, SS steel

[Gene Davis]

How would you model this roof assembly?

2 x 8 rafters with tails cut down to 2 x 4 depth, 24" centers, then 2 x 4 purlins atop the rafters at 24" centers, no sheathing, then 1" ribs x 20" space standing seam steel roofing.

Oh, and the rafters are square-cut on ends.

This rafter, purlins, steel roofing over is a common thing on barns and other ag buildings in south central Texas, and some architects and designers have done a refined version of same on houses. The houses are detailed with the roof overhangs exhibiting these details, and porch roofs are done all the way this way. Looking up, you see the rafters, the purlins, and the prefinished bottom of the roofing panels.

[johnnyprc]

Psolids...I just did something like this...