# Often asked: How Many Bags Of Concrete For A Fence Post?

## How do you calculate concrete for fence posts?

Example Fence Post Concrete Calculation

1. Calculate the post volume. Change post diameter to feet: 3.5” / 12 = 0.2917′ Find radius (½ of the diameter):
2. Calculate the hole volume. Hole radius (3x post radius): 3 x 0.1458′ = 0.4374′
3. Calculate concrete volume. Hole volume – post volume: 1.2026 – 0.1336 = 1.069 cubic ft.

## Is 2 feet deep enough for fence posts?

Dig post hole so diameter of the hole is 3 times the width of the post (i.e., the hole for a 4” wood post should be about 12 inches wide). The depth of the hole should be 1/3-1/ 2 the post height above ground (i.e., a 6-foot tall fence would require a hole depth of at least 2 feet ).

## How many bags of Postcrete do you need per post?

You’ll need to bury the posts at least 2ft In the ground. As for how many bags of postcrete you need per post, that’s purely dependant on how big you make the post holes. As a rule of thumb, when using standard post hole diggers, I average 1 bag per post. For larger holes I would allow 1.5 bags to 2 bags per hole.

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## How much sand and cement do I need for fence posts?

In terms of the ratio to use for a concreting fence posts, the best mix is a mix of 1:2:4 (1 cement, 2 sand, 4 aggregate). Concrete is always best mixed using a cement mixer to ensure it’s even, but if you only need to mix a little, hand mixing is ok (see mixing concrete project above for tips on how to do this).

## Should I use concrete for fence posts?

Concrete is the most secure material for setting fence posts, especially if you have sandy soil. Using premixed concrete rather than dry concrete will ensure ultimate security. While concrete is sturdy, it lacks the drainage of gravel and can trap moisture, ultimately leading to rot.

## What is the best concrete for fence posts?

Fast-setting concrete is ideal for installing fence posts since it doesn’t need to be mixed in a bucket or a wheelbarrow. Once you’ve finished digging your post holes, add about three to four inches of gravel into the bottom and compact it using a post or a 2×4.

## How deep should a 8 foot fence post be?

In general, holes should be at least 3 feet deep for posts that extend 8 feet or more above ground level. Posts that extend 6 feet above ground level should have holes at least 2 1/ 2 feet deep.

## Will wooden posts rot in concrete?

Simply setting the posts in concrete does create a condition that will accelerate rot in the bottom of the posts. With pressure-treated posts, the rot will be slow. The concrete at the top should be sloped away from the post to grade level to avoid water pooling around the base.

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## Should I use 4×4 or 6×6 fence posts?

4×4 is perfect for these very standard fence dimensions. Normally 4×6 or 6×6 are needed for gates or extreme wind loads.

## What is the difference between Postcrete and concrete?

Concrete takes several hours or a day or two to set. Postcrete sets in a few minutes, several tens of seconds, even, so you don’t have to support the post for nearly as long as you do with concrete.

## How long does it take for Postcrete to fully set?

No mixing is required – simply pour water into the post hole and add Postcrete. It sets quickly in 5- 10 minutes and is supplied in a weatherproof, tear resistant plastic bag.

## How do you keep fence posts from rotting in concrete?

Caulk Around the Fence Post Base Apply high-quality exterior acrylic latex caulk, or silicone specifically designed to adhere to concrete, at the base of the post.

## How do I keep my post level while concrete dries?

Fill the hole up to a depth of 8 inches from ground level with 1/2-inch drainage gravel. Use rough-cut gravel with sharp edges. It will hold the post better than smooth rock.

## How do I put a post in the ground without concrete?

Procedure:

1. Find a concrete surface and lightly tamp your digging iron against it.
2. Remove the turf and topsoil from the site of the post.
3. Dig the hole putting the displaced earth onto the tarp.
4. Pour 4 inches of gravel into the hole.
5. Place the post in the hole.
6. Add another 2 inches of gravel around the base of the post.