Posted by Texasmark1 on May 31, 2018 at 05:37:25 from (184.20.226.158):
In Reply to: Pole Barn Pad Site posted by ThadS on May 30, 2018 at 15:34:39:
22" isn't all that bad. Others have pretty much nailed it. I know there are barns out there over 100 years old. I built the main barn 40 years ago. 40x40 12' ceiling...bottom of trusses. I used 5" Creosoted poles on 8' centers and put them in as far as the digger would go...just over 3'. No concrete as I was short on funds and figured the dirt to pole resistance would keep them.
I did put a loft in it so there is some weight on the poles besides the wooden purlins and sheet tin. Soil it Houston Black Clay and varies with the weather from slush to rocks. However, once you get down a few feet it "sorta" remains constant in load supporting ability.
Best I can figure the worst have sunk 2' and the rest varying lengths less than that. Would digging a 12" dia hole and concreting it in have been better, surely but I didn't have the resources to do that.
Fast forward. 2005, New shop time. Hire a crew to build building; 5" square treated wood posts. Dig holes in partial buildup, packed, well drained soil ("Select Fill") sitting on top of the native black clay. Come back with a 5" #3 reinforced, 18" centers "floating" slab. No "beams" like when you build a brick house as I didn't see all that much weight, no attic, no stored item weight on the poles.
Shop was common commercially built, wood structured, pole barn with 12' clearance trusted roof, poles 10' centers, 30x50 with 15x50 covered side.
Current condition is the slab has cracked all over the place and only held together with the rebar. The worst post sinking on this was about 6" when I caught it and was in the same place where the soil shift caused the slab to crack.
Solution was to jack the poles up out of the ground, till back to original plumb and support pole with a brace, using the concrete pad as the supporting mechanism. I did and it's working.
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