My company builds high-end custom homes in Southern California. We used to frame everything with wood, but about eight years ago we started using light-gauge steel (LGS) because it gave us a higher-quality building. LGS won't rot, burn, or get eaten by termites, and every piece is perfectly straight. Now we rarely frame with anything but steel.
I recently started a business selling LGS materials and training builders to frame with steel. The same structural principles apply whether you frame with wood or steel; you still have studs, beams, headers, joists, and rafters. Some things are different, but once you understand what the differences are, you can frame with steel as confidently...
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