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Metal roof truss design


Hello Everyone

Looking for help in designing  metal roof truss’s

I have retired to Queretaro Mexico and am in the process of building my house, as I live in a remote area the availability of truss material is somewhat restrictive, wood is more expensive than metal so the pocket book says to use steel

14 & 12 gauge box tubing , called PTR here 1”, 11/2”, 2”, 3”, and 4” is readily available so I thought I would use this material to weld up the truss’s

There are four different spans, 36’, 30’, 21’, and 19’ 

Anyone willing to help would be much appreciated, 



Simple truss design, to support metal roofing only

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