I build about one a year attached to a barn. So far, here, we dont have to worry about any inspection or codes as long as it is built or subbbed out by the farm owner (except electric, if setting a new service). Got 20 and only had damage to one, it is a 3 sided shed, open to the east, 14.5' on the low side and 17' on the high side, 30' open span. Had 110 mile an hour straight line winds out of the east and I lost part of the roof and sheeting. Insurance was good, no problems with how it was built. Rafters (2x8's) held, stringer boards pulled out as the tin was screwed in and the stringers nailed with coated 10's. Shop we built in 1987. Put 14'x10" cedar poles 3' in the ground on 12' centers. Used 2 2x10's x 26' fir on each one (one on each side). Bolted a 2x6 plate on the side of the barn and set the other end of the rafters on it. Put 2x4 stringers 3' apart accross them. And also around the outside of the posts. Used tin on the outside, new tin on the roof. Lumber then cost me 40 cents a board foot for oak. Lined the inside with chip board. Surface mounted my electric and ran a feed off the barn. Poured the floor in one pour. It isnt pretty but it is functional, cost less than $2000 back then. On what I built this summer. Similar designs only did not use the long rafters, Put posts in 14' out and again at 28' so I could use 16' oak for the rafters. New metal (buy getting assorted colors and lengths my siding was $25 a square). 55 gallon barrel of black acrylic fence paint makes it all nice and uniform. Including ALL hired labor (but no floor) I spent right at $3000 each on 2-28x72x 15' lowside 18' high side sheds.
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