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

## How much quikrete do I need for a fence post?

Remember, the depth of the post hole should be one-half of the above-ground post height. (Example: For a 6 feet above ground post, use a post with an overall height of 9 feet and place 3 feet in the ground). The calculator will indicate the number of 50 lb. bags of QUIKRETE® Fast-Setting Concrete you need.

## How many bags of concrete do I need for a 4×4 fence post?

Mix two 50lb bags of concrete with water in a mixing tub or 5-gallon bucket. Add concrete into the hole and around the 4” x 4”. Depending on your climate, let concrete set up for 24 – 48 hours.

## 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.
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## How many posts will a 20kg bag of Postcrete do?

“Usually one bag of postcrete per post is enough, however you can use a two bags per post if you feel this is needed. The instructions are on the bag.”

## Is 2 feet deep enough for fence posts?

Project Instructions

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).

## 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.

## How do you install fence posts without concrete?

Backfilling the fence post hole with gravel is another common alternative to using cement. Start with a hole about the size of the one you’d dig if you were using cement, insert a third of the post’s length into the hole, and then fill with crushed gravel, tamping every five inches until flush.

## What is the best concrete mix 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).

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## How many bags of concrete do I need for a 10×20 slab?

A 60-pound bag yields. 017 cubic yards, and an 80-pound bag yields. 022 cubic yards. For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags.

## How do you install dry fence posts in concrete?

The list of top tips on dry setting fence posts includes:

1. Dig and prepare the holes in advance.
2. Line the bottom with pea gravel.
3. Set the post straight in the hole.
4. Pour the dry setting cement.
5. Give it time when dry setting fence posts.

## Do you need gravel under concrete?

Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.

## 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.

## Is Postcrete better than concrete?

Concrete spurs are ideal for repairing the posts, use postcrete, sets pretty quick and you should only need 1 bag per hole. Concrete blocks will be the easiest for sitting the shed bearers on, or split them in half.

## What size hole does a bag of Postcrete fill?

Just over one bag per hole should be sufficient, blue circle postcrete suggest 1 bag will fill a 8 x 30 inch hole with a 4×4 post. You’re dimensions are slightly bigger than that so better to be safe than sorry and have a bit extra.

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## What happens if you use too much water in concrete?

What happens when you add too much water to concrete and/or other cement mixes? Over-watered concrete may lead to lower strength, reduced durability, shrinkage cracking, and a variety of surface problems. It is critical that the proper amount of water be added to concrete and other cement mixes.