Went out to review a structure that has a vaulted ceiling, 7 degree slope (1.5:12 approximately) 4x8 beams 6'-0" on center, 2x6 t&g diaphragm, 28' long (wall to wall) with 1' overhang at exterior walls, 18' wide (three 6' bays). So I'm already looking at this like it's crazy but the main issue is the two center beams (6' apart plan east-west) are identical but the one on the left has twisted (lateral torsional buckling maybe) and the one on the right is just fine. They both are built the same, the beams meet at the ridge and appear to "lean" on each other to stay up. The owner did inform me that th one on the left that has buckled is the location of the decking joints. This means of the 18' width the first two bays are continuous 2x6 t&g 12' long and they stop at the left beam then a single 6' span to the end of the roof. I was saying maybe they didn't attach the decking to the beam correctly, but the whole beams leaning against each other to keep from dropping is not working in my mind, it's just not something i've designed or seen designed or seen any engineer be like "well technically this could work". No ridge beam, no rafter ties mean collapse to me, but this thing has been standing like that for more than 5 decades. Anybody know anything about setting up supports like that?
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