The inspector is correct. Most ag buildings are built with a discount in design forces. Buildings without constant human occupancy have a 13% reduction in design wind forces and seismic forces.

Seismic almost never controls in metal building design. And, most designs are below the full capacity of the materials. I expect your building will be fine, or else require only a few modifications (e.g. knee braces).

If the building was simply erected without any original engineering, you have a gamble. About 85% of contractors know exactly what they are doing and know when to build without an engineer, and they do it right.

The other 15%... well, you might be looking at some strengthening of connections, or other work.

If you end up building an all-new shop, I have some great advice here: http://steelengineer.hubpages.com/hub/How-to-Build-a-Shop.

It might be better to construct a new building for your business (closer to road = greater visibility = free advertising).

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