Our metal buildings come in two framing options. 14 Gauge Galvanized steel, that is 2 1/2" Square Tube, or 12 Gauge Galvanized steel that is 2 1/4" Square Tube. Both options are galvanized steel and square. The 12 Gauge is a little thicker steel and depending on your State, comes with a rust warranty. Please inquire with your sales person on what your 12 Gauge warranty would be.
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Thanks for the info!