This detail I found fascinating. This is inside the building near the centre of the shed, at the point of the roof. The I-Beams running parallel with the roof panels widen as they approach the centre and then thin out towards the edges. The roof is attached to the I-Beams in the same way as the walls, with fly bracing attached to the universal beam to spread the influence of the beam. There is also a bolt connection at the intersection of the two universal beams.