If your post is 6 feet tall you will dig down at least 2 feet.
Fence post footing depth.
How to install fence posts in footing.
The depth of your fence post footings will vary according to fence height wind loading and soil type as well as other factors.
For example if you have a 3 inch wide post that you need to sit over 1 83m 6ft in height above the ground we recommend the hole size should be.
Don t make postholes too small.
For example a 6 foot tall fence will need at least 2 feet of post in the ground.
Here are a four tips to help you find the correct fence post hole depth.
Consider the frost.
If you re still intent on setting fence posts yourself rather than having a professional do it the key is in filling the hole only halfway up with concrete.
230mm wide 9 x 600mm depth.
Instead you re depriving jack frost of a lip he can use to get a tighter grip on the concrete footing.
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.
Keep the height of your fence in mind when digging your post holes.
Set the post in the hole and brace it plumb or put a helper on the job and in line and level with the posts.
As a general rule of thumb you ll need to place at least 1 3 the height of the post in the ground.
If not conventional rules of thumb offer a reliable guide.
To prevent a post from decaying too quickly as well as to.
Gates require a hole with a depth of 36 to 40 inches in the ground and with a diameter of at least 12 inches.
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.
For example an 1800mm fence in wind zone a will require footings of a minimum of 600mm deep by 200mm wide whereas the footing dimensions for the same fence in wind zone d will need to be at least 700 1100mm deep.
How deep should i dig fence posts to begin we suggest digging the post hole so it is approximately three times wider than the fence post.
Fence posts anchored in concrete footings last for years as long as they re installed properly.
Building codes and ordinances in your area may stipulate a legal depth and diameter for fence post holes.
You need to dig a 12 inch wide hole for a 4 foot wood post.
Even though it seems this would result in less stability this is not the case.
As the post is 4 inches wide 3 multiplied by 4 is 12 so the hole needs to be 12 inches square.
That little footing will give the post something to stand on instead of damp soil.
6 divided by 3 is 2 therefore the depth of the hole required is 2 feet.
