Being a licensed professional structural engineer in two states i have designed and checked designs of many trusses. To really do it right you have to determine the design loading, PSF and any concentrated loads on he roof. Many designs are under designed and many over designed. You have to know the allowable stresses on the wood grade and species being utilized.
That being said, many trusses are home built for small buildings with non living spaces that work fine for most of the time and if a collapse does happen it is not too serious. Many people with a good feel for working with timber can fabricate a decent truss that will work.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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