We use 6x6 treated posts set  3 feet below ground level and 8 or 10 feet on center. We use a 2x6 treated bottom band to get the levelness of the build site this is also used as a concrete form. We use 2x6 girts on the sidewalls and gables at 30 inch spacing for the wall metal to attach to. We use a double 2x6 to 2x12 top plate on load bearing walls one on inside and one on the outside. We use pre manufactured trusses with 2x6 bottom and top chords with 2x4 bracing with 90 mph wind load the trusses are set 4 or 5 feet on center. Our 30 foot trusses are built with 2x6 top and bottom chords with 2x4 bracing. Our perlins on top of the trusses for the roof to attach to is 2x4 on 24 inch center laid down. We use 2x4 rat run braces on the top of the bottom chord of the trusses we attach a kick brace at the top of the gable end running at a angle to the next truss attaching to the rat run brace. We use 2x4 wind diagonal bracing in every corner the brace attaches to the top of the corner post under the top plate and attaches to the bottom of the next post above the bottom plate and is nailed to each girt in the middle. We use 1 painted metal with a 40 year warranty.