I’ve written a lot – maybe too much – about wood bowstring trusses. See here, here, here, here, and here. There’s no need to repeat all that. The short version: they were a clever way to span long distances with nothing but 20-foot-long 2x4s and 2x6s, but they had a bunch of flaws that made them a bad idea in the long run.
Like a lot of other structural forms, it is difficult to get decent photographs of them. Even if you can get up close to them in a roof or attic space, there’s stuff in the way of taking a photo and the lighting is terrible. So this demolition picture is, in some ways, the clearest view of them I’ve seen:
You’re seeing two trusses: the one on the left has been isolated by the demolition of the roof purlins and deck; the one on the right is now at the edge of the demolition.
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