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Best/Most Affordable Material to use for Long Rafter

I am getting ready to put a new roof on our house (changing the structure and all) and I am wondering what the best and most affordable kind of lumber or material is for the job. I need to span a 26' ...
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1answer
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Are 38mmx72mm roof trusses sufficient for a 6m span?

My roof truss timbers are 38mm x 72mm on 600mm centres with a 6m span. What's that in good old inches? It seems a little skimpy to me; is this normal for a modern house? I am trying to do a rough ...