| In multi-span purlin design, it is customary to assume beam continuity, avoiding joint analysis. |
| Therefore, the purlin is subject not only to bending but also to torsion stresses. |
| Two 2 in. x 6 in. struts run from purlin to truss principal. |
| Two loading directions were examined by adjusting the purlin fixing direction. |
| Next, Moore says, place the middle of the roll on the ridge pole, the purlin or brace that runs down the peak. |
| If the roof ridge or a purlin crosses the opening, you'll have to relocate the opening and use an angled or splayed light shaft between the roof and the ceiling. |
