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Pole Barns and Post Holes
Just built one this summer. I used treated 4x6 for the poles, dug the holes with a backhoe, poured a concrete pad in the bottom for the post to set on, and back filled with tamped screened gravel. My thinking goes like this: Dig the hole with the backhoe both to get it deep enough (4' frost line around here) and to give you some fudge room to get things plumb and square. I've used cement around the poles in the past for decks and such, and have ALWAYS regretted it, as the frost heaves the cement out of the ground. I had a "temporary" shed that wasbuilt with treated 4x4's set with a posthole digger. Didn't get the holes deep enough and they heaved a little, but when I tore it down to make room for the barn 15 years later (hence the quotes around "temporary" there was no sign of rot in any of them. In fact, I reused them for the ell on the barn. Part of the lack of rot is likely due to the gravelly and well-drained nature of the site. Get back to me in 25 years or so, I'll let you know how the 4x6's worked out...
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Pole Barns and Post Holes
Thanks, Bob. I pulled the permit on June 1st, and was loading hay into the loft on July 16th. I worked primarily by myself, my Son-ini-Law helped set and plumb the posts, set the trusses for the hayloft floor, and hang the rafters and tin on the roof. Add about a week to that for time spent on the ell. I was pretty sick of working on the barn by the time it was weathertight. My other SiL unexpectedly sold his place, and I was using his barn for hay storage, so I was on a pretty tight schedule to get things closed in before my hay showed up.
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Pole Barns and Post Holes
The local B&B has an old post-and-beam barn (well over 100 years) that they converted into a meeting/concert hall. The sills sit on strategically places rocks, it has nothing that could be considered a foundation. I built a deck around two sides of it. The major design concern was that the deck not move in relation to the barn. The sills on the barn had been replaced when it was renovated, so I bolted a 2x8 ledger to the new sills. The deck is 8 feet wide. The outer rim of the deck is supported by 4x6's on 8 foot centers. I set the 4x6's by digging the holes with the backhoe and pouring pads, in the same manner I did the barn. I then wrapped the 4x6's with several turns of heavy poly sheeting and stapled it in place before backfilling. It's been 4 years, and the deck hasn't even twitched. That's why I set the poles for the barn the way I did. I didn't wrap the barn poles, thinking the weight of the building and the hay would counter any tendency to heave. Time will tell if that was a wise decision or not.
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