woodsmith
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This job will definitely need Building Control approval and they will need a structural engineers report before they agree to anything, so the first thing I would do is get a structural engineer to look at it. It is worth bearing in mind that the loading on purlins is not just vertically down, it can be down and inward, which is logical, but with certain roof designs the loading can be down and outward. Either way I think that if you provided just a vertical support you would need to tie the two opposing purlins together with a sizeable brace.
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