If your posts are dimensional (4x4 or 6x6) the following process
worked well for me. If your posts are roundish, then simply set them
in the holes with a few inches of gravel in the bottom, and use
quickcrete (regular or quick setting - it's up to you.) that has been
mixed to a pretty thick consistency. Level the post in all directions
and cross-brace for 24 hours before adding attachments.
If using dimentional lumber, the way I did the posts all around my
house, is to:
1. String a centerline along the length of the fence run.
2. Dig the hole to desired depth (in my case, 24").
3. Insert 10" sonnet tube that has been cut to desired length/height.
4. Backfill, leveling the tube along the way.
5. Mix quickcrete (regular or quick setting - It's up to you.)
6. Fill the tube with mixed quickcrete.
7. Set post anchor according to the centerline.
8. After concrete is dry, test fit posts, mark holes, drill holes, and
bolt posts into post anchors.
The fence is now over 14 years old. No rot, no leaning.
You can just pour dry mix around the post.if you wish add a little water on
top to speed setting.In a few days it will be hard, meanwhile the dry mix
will hold the post in place.
Be aware the posts will need to be replaced eventually ,then you will have
to deal with the concrete.
reply not cross posted!
Locust is a good hard wood but is not treated.
For a simple fence like this I would simply tamp the earth back around the
post or buy a load of DGA roadfill (mixed rock from 3/4" stones to dust)
which once watered in packs very tightly.
If you feel you must use concrete, fill the hole about 1/3 full of water and
pour the dry mix in, poke at it with a stick to insure that all get wet.
This will make a low grade concrete that can be broken when replacing a post
in a few years.
Black locust will last longer than most treated...other than Osage
orange and a couple others, there's nothing better for posts (other than
being hard as blazes to drive a nail or staple in, of course).
If they're locust, it'll probably be 20+, anyway...but concrete probably
will shorten life some, but I have no experience w/ that to judge
relative to w/o. Have locust line posts that are probably at least 50
yrs old and still solid. It is, however, a fairly dry climate...
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