Mailboxes must be placed 6 to 8 inches away from the curb. Be sure to contact your local post office as mailbox placement regulations do vary throughout the United States.
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For example if you are building a fence thats 6 feet tall you will need a hole.

How deep should a mailbox post be in the ground. This is assuming that your post is on somewhat level ground. Standard mailbox height above the ground is 42 inches. Mark a spot on your lawn six to eight inches back from your curb.
Plan to dig your post holes 6 inches deeper to have room for gravel. If you do not have a raised curb contact your local postmaster for guidance. Posts that extend 6 feet above ground level should have holes at least 2 12 feet deep.
Use a pencil to draw a line on all four faces of the post at ground level. How Deep Should a Fence Post Be. Simply so how deep should a 16 foot post be in the ground.
230mm wide 9 x 600mm depth. Curbside mailbox posts should be buried less than 24 inches deep and made from wood no larger than 4 inches high by 4 inches wide. For example if you have a 3 inch wide post that you need to sit over 183m 6ft in height above the ground we recommend the hole size should be.
In general holes should be at least 3 feet deep for posts that extend 8 feet or more above ground level. The typical mailbox setback is normally between 6 to 8 from the curb. Holes should also be dug 10-12 inches wide or about 3 times the width of the post.
The typical post mount mailbox height is normally between 40 to 44 above the ground. Do not dig deeper than 24 inches. Before you dig be sure to call your local utilities company to mark any underground cables.
Dig deep enough that the height of your mailbox above the ground is around 42 inches. Use a post hole digger to dig a hole for your post at this spot. To begin we suggest digging the post hole so it is approximately three times wider than the fence post.
Standard mailbox height above the ground is 42 inches. Steel or aluminum pipes with a 2-inch diameter are also acceptable. Tamp the sand down too a bit then cover lightly with sod.
The incoming mail slot or door must be 41 to 45 inches from the ground. Compact the soil around it. The depth of the post hole needs to be 13 to 12 the height of your fence.
Also reassess your fence layout and make sure your posts are where you want them. Dig deep enough that the height of your mailbox above the ground is around 42 inches. The USPS official mailbox regulations state that the mailbox should be positioned at a height between 41 45.
Use a post hole digger to dig a hole for your post at this spot. If you do not have a raised curb contact your local postmaster for guidance. I tend to make mine at least 20 deep Just drop the post into the hole and make sure its standing vertically.
How deep should I dig fence posts. So a six-foot-high finished post ideally needs to be buried three feet into the ground. When measuring take note that this height measurement is from the ground where your post is placed and not the road.
When it comes to digging fence post holes the depth depends on the height of your fence. Install a Mailbox Post without Concrete but still with a 44 wood post For this installation we recommend the Mayne No-Dig Ground Anchor which costs around 32-35 at most online retailers but at the time of this article is under 20 at Amazon for Prime members. Mark a spot on your lawn six to eight inches back from your curb.
The deeper the post hole is the sturdier your fence will be. As a general rule you want up to 13 of the post height situated below ground level. Then center and level your mailbox within the tube and fill around the post with sand.
Bury an empty 6 or 8 inch tube two feet deep and flush with the ground. You should always bury one-third of your fence post underground. For a 6-foot fence for example you need a 9-foot post so that 3 feet can be underground.
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