That sounds like a great idea! Is that standard practice?A round, 12" diameter by 4" thick concrete block was placed on top of the gravel. The posts were then set on that concrete block and the hole was filled with concrete.
Last edited by rondog; 04-16-2016 at 17:31.
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I have seen rotting issues occur when people hold a post up off the ground and pour concrete around it. This method causes the concrete around the post to act as a bucket to trap and hold water against the portion of the post embedded in the concrete. There is no way to drain and dry the embedded post, so it rots. It would appear by adding the concrete block at the bottom of the hole you create a concrete cold joint that would likely enable the bottom of the bucket to drain and not trap water against the embedded post.
When doing fence posts you would generally put rock in the bottom of holes set the post on them a pour concrete around them. The post resting on the ground is less likely to rot off than it would if a concrete bucket is created. There is not down force on a fence post.
The bottom the your post having a big concrete base is necessary to resist down force as well as lateral wind loading and uplift. In a pole barn type building the only way to transfer all loading conditions to the ground is through the poles. The diameter is required to increase the surface area on the undisturbed soils around and under it.
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That makes sense. Thanks.
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That turned out great.
Enjoy it.