What size hole for 3×3, 4×4, 5×5, 6×6 and 8×8 fence post | what size hole for 3×3 post | what size hole for 4×4 post | what size hole for 5×5 post | what size hole for 6×6 post | what size hole for 8×8 post | How deep should a 6×6 post be in the ground.
Fence posts are built up surrounding the property area of land, it is made of iron steel rod or Timber, in those areas wooden Timber is not inexpensive, mostly agriculture land is surrounded by wooden Timber post, this is made for protection of agricultural land, farm house and their property, and some due to privacy reasons.
A boundary gate or side gate or garden gate is usually placed to protect certain to protect or keep kids or pets in, or intruders or animals out, or even just for your privacy. Generally, a side gate or garden gate is about 1800mm (6ft) high.
Fence post/ boundary gate post/ side gate post/ garden gate post are in round, square or rectangular shape made of steel, concrete pole or wooden Timber, but most commonly used is wooden timber fence post.
Size of posts:- commonly used size of fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber are in square shape of cross sectional dimension of 3″×3″ (75mm × 75mm), 4″×4″ (100mm × 100mm), 5″×5″ (125mm × 125mm), 6″×6″ (150mm × 150mm) and 8″×8″ (200mm × 200mm) having total length about 8 feet, out of 8 feet post length minimum 2 feet buried into the ground and about 6 feet height above the ground level.
Size of fence post hole:- for fencing post you should dig out the soil from the ground and make a post hole, regarding this, “what is the size of post hole?”, it’s totally depends on height of fence post above the ground and cross-sectional dimension of fence post, depth of post hole should be 1/3 to 1/2 of fence post height which is exactly above the ground and width of post hole should be 3 times the diameter or width of fence of post.
For example a fence post is 6 feet in height above the ground and their cross sectional dimension is 4″×4″, minimum depth of post hole is 1/3 of 6 ft is equal as 2 feet must be buried into the ground and maximum should be 1/2 of 6 ft is equal as 3 feet and width of post hole is 3 times of 4″, that should be equal as 12″ or 1 feet.
Thumb rule for size of post hole:–
● Depth of post hole – depth of the post hole should be 1/3 to 1/2 of height of fence post above ground ((such as the hole for a 6” high wood post should be about 2 feet (24 inches) deep buried in the ground.
● Diameter or width of post hole – diameter of the hole is 3 times the width of the post (such as the hole for a 4” wood post should be about 12 inches wide).
What size hole for 3×3, 4×4, 5×5, 6×6 and 8×8 fence post
Thumb rule for size of post hole:–
● Depth of post hole – depth of the post hole should be 1/3 to 1/2 of height of fence post above ground ((such as the hole for a 6” high wood post should be about 2 feet (24 inches) deep buried in the ground.
● Diameter or width of post hole – diameter of the hole is 3 times the width of the post (such as the hole for a 4” wood post should be about 12 inches wide).
“What is the size of post hole?“, size of post hole totally depends on height of fence post above the ground and cross-sectional dimension of fence post. Depth of post hole should be 1/3 to 1/2 of fence post height which is exactly above the ground and width of post hole should be 3 times the diameter or width of fence of post.
What size hole for 3×3 post
As a rule of thumb and guidelines, for a 3“x3” (75mm x 75mm) fence post and a 4 foot high post, you need a hole size of at least 1.5ft (18″) deep and 1 foot (12 inches) wide in the shape of a square.
Thus, a hole size of 1.5 feet deep and 1 foot in diameter are used for 3×3 (75mm × 75mm) post as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.
What size hole for 4×4 post
As a rule of thumb and guidelines, for a 4“x4” (100mm x 100mm) fence post and a 6 foot high post, you need a hole size of at least 2ft (24″) deep and 1 foot (12 inches) wide in the shape of a square.
Thus, a typical hole size of 2 feet (600mm) deep and 1 foot in diameter are used for 4×4 (100mm × 100mm) post as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.
What size hole for 5×5 post
As a rule of thumb and guidelines, for a 5“x5” (125mm x 125mm) fence post and a 6 foot high post, you need a hole size of at least 2ft (24″) deep and 1.25 feet (15 inches) wide in the shape of a square.
Thus, a typical hole size of 2 feet (600mm) deep and 1.25 feet in diameter are used for 5×5 (125mm × 125mm) post as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.
What size hole for 6×6 post
As a rule of thumb and guidelines, for a 6“x6” (150mm x 150mm) fence post and a 6 foot high post, you need a hole size of at least 2ft (24″) deep and 1.5 foot (18 inches) wide in the shape of a square.
Thus, a typical hole size of 2 feet (600mm) deep and 1.5 feet in diameter are used for 6×6 (150mm × 150mm) post as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.
What size hole for 8×8 post
As a rule of thumb and guidelines, for a 8“x8” (100mm x 100mm) fence post and a 8 foot high post, you need a hole size of at least 3ft (36″) deep and 2 feet (24 inches) wide in the shape of a square.
Thus, a typical hole size of 3 feet (900mm) deep and 2 feet (600mm) in diameter are used for 8×8 (200mm × 200mm) post as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.
How big should a hole be for a post
In general, holes should be at least 3 feet long and 2 feet wide 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 long and 2 feet in diameter. Posts that extend 4ft to 5 feet above ground level should have holes at least 2 feet long and 1 feet wide.
How big of a hole do i need for a 8×8 post
As per general thumb rule and guidelines, for a 8×8 post you will need holes should be at least 3 feet long and 2 feet wide for posts that extend 8 feet or more above ground level.
How big of a hole do i need for a 6×6 post
As per general thumb rule and guidelines, for a 6×6 post you will need holes should be at least 2.5 feet long and 1.5 feet wide for posts that extend 6 feet above ground level.
How big of a hole do i need for a 5×5 post
As per general thumb rule and guidelines, for a 5×5 post you will need holes should be at least 2 feet long and 1.25 feet wide for posts that extend 6 feet above ground level.
How big of a hole do i need for a 4×4 post
As per general thumb rule and guidelines, for a 4×4 post you will need holes should be at least 2 feet long and 1 feet wide for posts that extend 6 feet above ground level.
How big of a hole do i need for a 3×3 post
As per general thumb rule and guidelines, for a 3×3 post you will need holes should be at least 1.5 feet long and 1 feet wide for posts that extend 4 feet above ground level.
How deep should a post be in the ground
In general, a post 6×6 or 8×8 that extend 8 feet or more above ground level should be at least 3 feet deep buried in the ground. Posts that extend 6 feet above ground level should have holes at least 2 1/2 feet deep. Posts that extend 4ft to 5 feet above ground level should have holes at least 2 feet deep.
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What size concrete tube for 4×4 post
What size concrete tube do i need for a 4″x4” post? The rule-of-thumb is to use a tube diameter 2 times the post width, therefore use a 8” diameter concrete tube (Sonotube, Quick tube, or SAKRETE tube) for a 4×4 fence, deck or pergola post. Thus, 8″ diameter of concrete tube is an ideal size for 4×4 post.
What size concrete tube for 4×6 post
What size concrete tube do i need for a 4″x6” post? The rule-of-thumb is to use a tube diameter 2 times the post width, therefore use a 10” diameter concrete tube (Sonotube, Quick tube, or SAKRETE tube) for a 4×6 fence, deck or pergola post. Thus, 10″ diameter of concrete tube is an ideal size for 4×6 post.
What size concrete tube for 6×6 post
What size concrete tube do i need for a 6″x6” post? The rule-of-thumb is to use a tube diameter 2 times the post width, therefore use a 12” diameter concrete tube (Sonotube, Quick tube, or SAKRETE tube) for a 6×6 fence, deck or pergola post. Thus, 12″ diameter of concrete tube is an ideal size for 6×6 post.
Auger diameter sizes
Typically, the Auger drill bits are sharp points comes in sizes ranging from 2 to 18 inches in diameter with intermediate sizes such as 4″, 6″, 8″, 10″, 12″, and 18 inches. Typically, the auger drill bit sizes are comes in the following diameters: 2 inches, 4 inches, 6 inches, 8 inches, 10 inches, 12 inches & 18 inches.
What size auger for a 3×3 post
For a 3×3 rectangular wood post (5″ across the diagonal) a 6″ diameter of auger works nice and for 3 inches round wood post you will need 4″ diameter of auger. A 3×3 post (actual size 2.5″x2.5″) has a maximum width of just over 3″ (diagonally). Therefore, the 3×3 post will likely fit into a hole drilled by a 6″ diameter auger.
What size auger for a 4×4 post
For a 4×4 rectangular wood post (5″ across the diagonal) a 8″ diameter of auger works nice and for 4 inches round wood post you will need 6″ diameter of auger. 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 8″ diameter auger.
What size auger for a 5×5 post
For a 5×5 rectangular wood post (7″ across the diagonal) a 10″ diameter of auger works nice and for 5 inches round wood post you will need 8″ diameter of auger. A 5×5 post (actual size 4.5″x4.5″) has a maximum width of just over 7″ (diagonally). Therefore, the 5×5 post will likely fit into a hole drilled by a 10″ diameter auger.
What size auger for a 6×6 post
For a 6×6 rectangular wood post (7.75″ across the diagonal) a 12″ diameter of auger works nice and for 6 inches round wood post you will need 10″ diameter of auger. A 6×6 post (actual size 5.5″x5.5″) has a maximum width of just over 7.75″ (diagonally). Therefore, the 6×6 post will likely fit into a hole drilled by a 12″ diameter auger.
What size auger for a 1 7/8″ steel post
For a 1 7/8″ steel post a 6″ diameter of auger works nice, so for a 1 7/8″ steel post you will need 6″ diameter of auger.
What size auger for a 2 3/8″ steel post
For a 2 3/8″ steel post a 6″ diameter of auger works nice, so for a 2 3/8″ steel post you will need 6″ diameter of auger.
Conclusion:-
Depth of post hole should be 1/3 to 1/2 of fence post height which is exactly above the ground and width of post hole should be 3 times the diameter or width of fence of post. For a 4×4 size and 6 foot high fence post, you will need at least hole size of 2 feet (24″) deep and 1 feet (12″) wide in square shaped.