Can you see what the problem is with this roof?

The rule of thumb is that hips, purlins and ridge boards are at least 1.5 times the depth of the rafter. In this case the hip could have been deeper but the purlin should have been cut to the detail below and real carpentry skills are needed to do this. That way all of the loads can be transferred safely down the hip to the wall plate.

By LABC

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