The design is based around posts (previously poles), that are set four to five feet into the ground, spaced four to eight feet apart. Trusses are attached on top of the posts and purlins are attached to trusses.  Instead of studs used in traditional buildings, these posts provide a strong structural frame for the exterior walls.  Horizontal supports (girts) are attached to the posts to attach the siding.   Steel is then attached to the girts and purlins creating a system that is both sturdy and cost efficient.