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Old 05-27-2009, 11:24 PM   #1
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I plan on renting an auger this weekend to do my fence posts. How many bags will I need per post? Posts are 4x4" 3' down.

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Old 05-27-2009, 11:35 PM   #2
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I don’t have a formula for this but if your hole has a 12” diameter 3’ deep then two bags will be enough. This will leave room to fill in with matching soil.

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Old 05-27-2009, 11:41 PM   #3
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I heard if you use an auger it gives you a more precise hole and calls for less concrete. I remember hearing a bag a post however I don't know how big the bags were
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Old 05-28-2009, 08:30 AM   #4
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rick....theres a chart on the bag that will give you your answer.
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Old 05-28-2009, 10:02 AM   #5
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An 80 pound bag of concrete will yield .66 cubic feet of concrete. The box stores' bags are often 60 pounds these days for some reason.

I'd plan on one sack per post if you're sinking the post the full 3' in the hole.
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Old 05-28-2009, 10:35 AM   #6
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is everyone's 4x4's treated
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Old 05-28-2009, 11:48 AM   #7
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I just thought I would say cementing in post I used treated 4x4's and being cement was to wetI am thinking for my 4x4's twisted some time later.
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Old 05-28-2009, 11:02 PM   #8
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Thanks for the replies everyone As the summer progresses you will be hearing from me. I bought a white elephant. Now I'm getting a crash course in carpentry, roofing, wiring, masonry and landscaping.
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Old 05-29-2009, 07:19 AM   #9
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It's not a good idea to cement wooden posts, even if they are treated. They will shrink in the concrete and get loose.
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Old 05-29-2009, 09:01 AM   #10
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I agree with M6...while it's done alot...it's not always the best practice....here's another thread with links to other opinions....Setting A Fence Post
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Old 05-31-2009, 04:56 AM   #11
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I don't know what kind of fence you are building, but I rather to use metal rather than wooden posts. Either of them I set with one bag of the quick setting concrete that can be mixed right in the hole.

Also pick up a inexpensive post level to make plumbing the post even easier. Such as this - http://www.amazon.com/Johnson-Level-.../dp/B0009WG3HI

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