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A: Finding the right amount of concrete depends on the size of the hole and the size of the post. The diameter of the hole should equal about three times the diameter of the post and the depth of the hole should be about ⅓ to ½ the total length of the pole.

## How much concrete do I need for a 4×4 post hole?

A 4″ diameter fence post needs a post hole that’s about 12″ in diameter. The depth below ground should be about 1/3 the height of the post above ground. For example, a 5′ high post will need about a foot and a half deep hole.How Much Concrete For A 4×4 Fence Post? Depth 50 Lb Bags 10″-14″ 2 16″-22″ 3 24″30″ 4 32″36″ 5.

## How much quikrete does it take to fill a post hole?

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). Add about 6 inches of QUIKRETE All-Purpose Gravel into the bottom of the hole.

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

How much Post Mix do I need for a fence post? The exact amount of Post Mix Concrete needed will vary depending on the width and depth of the hole, but as a general rule you’ll need about one and a third bags for a standard fence post.

## Is 2 feet deep enough for fence posts?

2 feet is the minimum depth that you should dig your fence post holes for. To dig the holes one-third to one-half of the post’s aboveground height, is a general formula. The deeper you dig the holes, the more stability your fence has.

## Can you put dry concrete in a post hole?

Fast-setting concrete is ideal for setting posts because there’s no mixing—you simply pour the dry concrete from the bag right into the hole, then add water.

## How big of a hole do I need for a 4×4 post?

The diameter of your post hole should be three times the diameter of your post. So, if you’re planning on using a four-inch round or 4×4-inch square post, your post hole will need to be 12 inches in diameter. For a six-foot-high fence post, we would need a hole that’s 36 inches deep and 12 inches in diameter.

## How deep should an 8 foot post be in the ground?

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.

## What happens if you add too much water to quikrete?

When a concrete mixture is too wet, it causes a greater amount of shrinkage during the drying process than is needed. As a result, the concrete has a great likelihood of cracking and for those cracks are likely to be a fairly good size. A watery mix actively reduces the compressive strength of the dried concrete.

## How do you calculate concrete holes?

Calculate Concrete Volume With the volume of the submerged post and the volume of the hole figured out, subtract the post volume from the hole volume, and you will have the volume of concrete needed for each hole. Simply multiply that amount times the number of posts to get a total quantity.

## How do I calculate how many fence posts I need?

Measure the length of your yard. This will be your fence length. The number of posts you will need is your fence length divided by 6 or 8. For example, a yard of 100 feet with 8-foot placement will require around 13 posts.

## How much concrete do I need for a 30×30 slab?

18 yards of 3000 psi concrete mix @ 135.00 per yard. Wire mesh reinforcement. A double row of #4 rebar around the edges. Labor to form the slab.

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

“Usually one bag of postcrete per post is enough, however you can use a two bags per post if you feel this is needed.

## Is 18 inches deep enough for a fence post?

The general rule of thumb when setting a post is that the depth of the post’s hole needs to be one-third to one-half of the actual above-ground height of the post. So, a six-foot-high finished post ideally needs to be buried three feet into the ground.

## Can I pour concrete in a hole full of water?

The water in the hole under the pipe can be sucked out with a wet-dry vacuum before and during the repair job.

## What is the easiest way to dig post holes?

There’s no question about it — the fastest and easiest way to dig post holes is to use a gas-powered earth auger. Fill the tank with gas, position the auger on the ground, fire it up, hold on tight and watch the soil come streaming out of the hole.

## How long does concrete take to set in post hole?

Typically, you can apply some weight to the posts after 4 hours, but it’s a good idea to wait at least 24 hours before resuming fence construction. Standard concrete mixes may take up to two hours to set and should cure for 24 to 48 hours before any forces are applied to the posts.

## How long will a treated 4×4 post last in the ground?

How Long Will A Treated 4×4 Last In The Ground? (Explained) A treated 4×4 will last 20 to 25 years in the ground if the conditions in the soil and climate are favorable. That number could increase to 40 to 75 years if you install the treated 4×4 in a cement ring rather than the soil.