A common rule of thumb, is to dig the hole 3 times as large as the post, and to a depth of 1/3-1/2 of the post height above ground. so for a 8′ high fence, using 4×4 posts. dig the holes 12″ in diameter, to a depth of 2 1/2 – 4′. Of course, that’s assuming you’re setting the posts in concrete.
What size auger should you use for a 4×4 post?
Post Holes- If you plan to secure your posts with cement or by tamping dirt, you will need spacing around the post to do so. For example: A 4×4 post (actual size 3.5″x3. 5″) has a maximum width of just over 5″ (diagonally). Therefore, the 4×4 post will likely fit into a hole drilled by a 6″ diameter auger.
What size auger do I need for fence posts? A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. Smaller augers, like 4- or 6-inch options, are appropriate for light-duty work (like mailboxes) as well as metal fence posts for chain-link fences.
Can you use an auger to drill post holes? A one-man auger with a 6-inch auger bit can be used to dig holes for steel fence posts. A one- or two-man auger with a 10-inch bit can be used to dig holes for a 4 x 4 wooden fence post or larger plants.
How do you make a post hole auger?
How deep should fence posts be? As a general rule of thumb one-third of your post should be underground, the other two-thirds above. Let’s take a standard 6foot (72 inches) fence as an example. You will need a 9foot (108 Inches) post so that 3ft (35 inches) can be underground and 6ft can be above ground.
What size post do you use for an 8 foot fence? – Related Questions
What size auger do I need?
To choose the auger that best fits your needs, consider how you’ll use it. If you plan on only using your auger to plant plugs, for instance, then a 2- or 3-inch auger will fit your needs. If you anticipate the need to bury stakes or set small posts, then you may prefer a 4-inch auger or another, larger size.
How deep should a 4 foot fence post be?
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 deep should a 7 foot fence post be?
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 is the best tool for digging post holes?
You can use a post hole digger or power auger to dig the hole. A post hole digger is a manual tool and will get the job done in average soil. If you have hard, rocky soil or a lot of roots – you may want to opt for a power auger.
How long does it take to dig post holes with an auger?
Power augers can dig as many holes in an hour as a post hole digger can dig in eight hours, with hole sizes ranging from 6” diameter holes and up.
Should I use an auger or post hole digger?
Post hole diggers focus on one task – they dig holes for posts, whereas a hole auger is suited for a wide variety of tasks around the garden. Post hole diggers rely on more work than a hole auger, these heavy hand tools are basically thrown hard into the soil with force then lifted out.
Can you use an auger on wet ground?
Especially if conditions are wet, the grass and vegetation may clog the end of the auger, sticking in place and making it impossible for the blades to get a grip on the soil below. Save yourself some time (and your auger a little trouble) by using a shovel to remove sod before you drill.
How do you make homemade auger?
How deep can you dig with a post hole digger?
Post hole diggers have a maximum effective depth of about 3/4 of their handle length, so a five foot pair will dig about 3 1/2 half deep. Very hard earth like clay is extremely difficult to dig with a manual pair of post hole diggers. A rock bar may work on dry clay.
Do augers work in clay soil?
Augers are also great for soil that is tough to dig. Heavy clay soils, which tend to clump and stick to shovels, are no problem with an auger.
Should fence posts be set in concrete?
Concrete provides a strong foundation for wooden fence posts, but can rot them more quickly. Setting them in dirt, with or without gravel or crushed rock depending on your soil type, can help the posts last longer before going rotten. You can also use metal fence post anchors to prolong their life.
Can you put dry concrete in a post hole?
Why do fence posts rot at ground level?
Wood fence posts will rot due to prolonged exposure to moisture in the soil.
Is an 8 inch hole big enough for 4×4 fence 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 big of a hole do I need for a 4×6 post?
For a six-foot-tall post, therefore, you would dig a hole two feet deep. The ideal diameter, meanwhile, should measure three times the width of the post. So, for a standard 4×4, the ideal hole would span twelve inches across.
How is auger bit measured?
A) Measure the distance between the opposite side of the screw point at its base and the outer edge of cutting lips (D1). B) Measure the thickness of the screw point at the base (D2) C) Subtract 1/2 of the (D2) measurement from (D1) to obtain radius (D) of the bit.
How far should a 4 foot post be in the ground?
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.
How long will a treated 4×4 post 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 do I keep my post level while concrete dries?
You need to level it in two directions with a 4-foot level. After getting it straight in the first direction, hold one of the braces against the post and drive a single screw to connect the brace to the post. You can then level and brace the post in the other direction and begin filling the hole.
How many bags of cement do I need for a fence post?
1 – 4 bags of concrete per fence post are typically what’s needed. This depends on the type of soil, fence design, height, post size and bag weight. In general the depth of the post’s hole needs to be 1/3 to 1/2 of the above ground height of the post.
How do I make sure fence posts are in line?
How big should the hole be for a 6×6 post?
A 6×6 post requires a 10″-diameter hole. Shovel a 6″ layer of gravel into the hole to provide drainage.
How big of a hole do I need for a 4×6 post?
For a six-foot-tall post, therefore, you would dig a hole two feet deep. The ideal diameter, meanwhile, should measure three times the width of the post. So, for a standard 4×4, the ideal hole would span twelve inches across.
How much concrete do I need for a 4×4 fence post?
| Depth | 50 Lb Bags |
|---|---|
| 10″-14″ | 2 |
| 16″-22″ | 3 |
| 24″30″ | 4 |
| 32″36″ | 5 |
How much concrete does it take to fill 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.
