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Sorry for the lack of information. I'm located in northern New Mexico. Small wind loads, but snow can get to 24". The pulins are 2X4 steel on edge welded to the trusses. I had planed on 3' centers per the steel company I bought the material from. They stated that the purlins on edge could go up...

I'm starting a new hay shed which is to be 30' X 40' and have planned to use 4X4 steel columns supporting 30' manufactured steel trusses which support 4" purlins and then steel roofing. The columns and truss spacing were to be 13.3' for good frontal access, but I am now beginning to wonder...

I happened to find this community this morning and was pleased to find others doing some of the same things I do. I'm also writing to find help in sizing the spacing of metal purlins on a new hay shed I'm going to put up. My hay shed is 30' X 40'. I am plannig to use 4X4 steel columns...