How big should post hole be? Rule of Thumb
Width = 2 x the width or diameter of the post (a 100mm x 100mm or 4inch x 4inch post would require a 200mm x 200mm or 8nch x 8inch hole). Hole depth = put approximately 1/3 of the post in the hole. A 2m (6 foot) post should have up to 600mm (2 foot) in the ground.

How deep should a fence post hole be? The width of the post hole should be 3 times the width of diameter of the post. For example, if you are erecting a 6 foot high fence using 4 inch fence posts, the posts need to be 6 feet above the ground. 6 divided by 3 is 2, therefore the depth of the hole required is 2 feet.

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.

How deep should a 12 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.

How big should post hole be? – Related Questions

How deep should 6×6 post be?

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.

Is 1 ft deep enough for fence post?

To begin, we suggest digging the post hole so it is approximately three times wider than the fence post. This rule of thumb that can be followed for all size posts (e.g. a 6ft high fence would require a hole depth of at least 600mm or 2ft).

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.

Is 2 feet deep enough for a 6-foot fence?

For example, if you are building a fence that’s 6 feet tall, you will need a hole that is at least 2 feet deep. That also means that you’d need to use an 8-foot post. The hole will need to be about 3 times the width of your post. So, if you’re using a standard 4×4 post, you’ll need a hole that’s 12 inches wide.

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

It’s right for a 4×4 fence post to have 1 bag per hole. The depth of the post hole should be half of the post height. For a 6′ above ground post, place 3 feet in the ground and use a post with an overall height of 9 feet.

How long will pressure treated 4×4 last in the ground?

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. There are a few factors that influence how long the 4×4 can last in the ground.

How many bags of concrete do I need for a post hole?

Most fence post holes will need between 1 – 4 bags of concrete to securely hold the post in place. The best way to determine the size of the hole is: Diameter of the hole is 3 times the width of the fence post. Depth of the hole is one-third to half the above ground height of the fence post.

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 long will a treated 6×6 post last in the ground?

5 Answers. A PT post will last a long time in concrete, maybe 5 to 10 years in soil alone. I suggest you embed the post in concrete, trowel a peak around the post so water runs off, and don’t let the PT post come in contact with the ground.

How much concrete do I need for a 6×6 post?

General rule of thumb is 1/3 of post in the ground. I also would use concrete . 6×6 posts are over kill for a fence of this height IMO but you maybe matching to existing so do what you want to do.

What is the fastest way to dig a post hole?

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

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 long does Postcrete take to set?

Postcrete usually sets within 5-10 minutes, in suitable conditions with the solution stiffening within 1-2 minutes.

Should wood fence posts be set in concrete?

First rule, gang: Do not set wooden posts in concrete. Look, no matter what preventative steps you take (and I’ll get to those), eventually wooden posts rot, and eventually you’ll have to set new ones. Not only does burying them in concrete make for more work down the line, it actually can speed up the rotting.

Are post hole diggers any good?

T-handle post diggers are particularly good for digging into ground that’s hard or otherwise difficult to dig into using a shovel or another type of post digger. Therefore, this digger would make a good choice, particularly when you’re working with soil that’s less than ideal.

How deep can you dig with a shovel?

If you try digging into the earth you can probably work really really hard and dig 2 feet deep with a shovel! A house with a basement starts with a hole about 8 feet deep. The foundation for sky scrapers is sometimes around 50 meters!

Why deck posts should not be set in concrete?

A deck post should always be placed on top of footing, not inside concrete because it can break. Concrete tends to absorb moisture and wood expands when it gets wet, so these two factors combined will result in the wood breaking the concrete.

How do I keep my post from rotting in the ground?

Treat the Post With Preservatives

Soak the bottom of the posts in a wood preservative containing copper napthanate, such as Cuprinol. Note: Available at some paint stores and home centers, this wood treatment is specifically designed for in-ground applications.

How deep should post be for 8 foot fence?

How Deep Should a Fence Post Be? For an average fence post, about 6 to 8 feet tall, prepare to dig a post hole about 2 feet deep. To install a fence post, you’ll need a shovel or post digger, a 6-foot level, soil, and gravel or crushed stone.

What kind of cement do you use 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 many bags of concrete do I need for 2 yards?

If you’re using 50lb bags of concrete, you’ll need 72 bags to make a yard. If you’re using 60lb bags of concrete, you’ll need 60 bags to make a yard. If you’re using 80lb bags of concrete, you’ll need 45 bags to make a yard.

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