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ChimChim 04-18-2009 07:19 AM

Concrete around treated fence post or not?
I live in southeast Ohio and want to install a privacy fence. Have heard by some that it is better to put concrete around the posts, and also have heard to use pea gravel or just dirt. Does anyone know the best way?

Thank you,

yesitsconcrete 04-18-2009 07:27 AM

crushed stone's my choice,,, conc hastens rot

ChimChim 04-18-2009 07:32 AM

But will the crushed stone hold the post true & tight?

CrossWorks 04-18-2009 10:08 AM

This topic was brought up a couple years ago:

Good information!!

vsheetz 04-18-2009 07:04 PM

I like to set posts in concrete - they stay solid and true for a long long time. I use the bagged concrete you mix right in the hole - pour in the contents of the bag, add water, mix.

I also like to use metal posts rather than wood (round with brackets for the wood attachment, or square/flush that can be covered with wood and disappear. Years from now when the fence boards need replacement, the posts will not...

snake2k 04-18-2009 11:13 PM

The only time I use concrete when installing wood fence is around the gate post.The key to a solid install is in the tamping of the dirt around the post.Once the post is in position add about 3 or 4 inches of dirt and tamp solid,repeat the process until you reach the top.

snake2k 04-18-2009 11:26 PM

One other thing I forgot to mention,if your installing a 4 inch post use a 8 inch auger bit.Using too large of a bit will cause problems.The least amount of earth disturbed around the post the better,also means less tamping.

ChimChim 04-19-2009 06:56 AM

So basically...having dirt around the post will not make it opposed to concrete?

ccarlisle 04-19-2009 07:00 AM

The fact is is that concrete has a very alkaline pH and over time will degrade the wood fibres of the post. Nothing to do with 'rot' per se although it will look like, I dunno... termite damage.

We put roofing membrane around our posts and use concrete and stone at the base. Since you also deal with frost heave, you may not think either that just dirt is enough to counter the changing seasons.

CrossWorks 04-19-2009 07:48 AM

How about the best of both worlds...and I've done it this way. Tamp dirt for the first 3-1/2' and then add 6" of concrete at the very top. Look at it as a solid ring that will help stabilize the post. Just remember to put a strip of rubber membrane at that point around the post as protection from the crete. (Grace Ice&Water shield, you canget it at the Depot for 15-$20)

yesitsconcrete 04-19-2009 08:21 AM

i remember lots of cows who thought our barb'd wire fences were great :laughing: & they were only split locust posts - no conc, no crush'd stone, no nuttin',,, our back yard fence's p/t 4x4 posts & boards - no stone, no conc, just dirt - 20 yrs old - still functioning !

you do what you want w/your fence !

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