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Old 02-02-2009, 12:03 AM   #1
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Setting a wooden post in concrete


I am setting a 4"x6" treated wooden post in concrete out in Arizona. It will be used to hold-up a shade sail fabric. The footing is 1'6" deep. I am using 4000 psi concrete.

Should I pour the concrete all the way to the top of the hole (even at grade level) or should I go about 1' worth of concrete and fill-in the remaining 6" with soil?

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Old 02-02-2009, 09:04 AM   #2
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Setting a wooden post in concrete


Quote:
It will be used to hold-up a shade sail fabric.
Ayuh,..

What are the expected Wind Loads,..??
Shear forces,..??
How Tall will the posts be,..??

The concrete is merley used as a Ballast to hold the posts,....

If there's substantial shear forces,... I'm thinking 18" deep isn't much of an Anchor.....

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Old 02-02-2009, 03:52 PM   #3
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Setting a wooden post in concrete


Quote:
Originally Posted by Bondo View Post
Ayuh,..

What are the expected Wind Loads,..??
Shear forces,..??
How Tall will the posts be,..??

The concrete is merley used as a Ballast to hold the posts,....

If there's substantial shear forces,... I'm thinking 18" deep isn't much of an Anchor.....
The sail shade is only 12'x12' and the wind loads will be very minimal. Most people use 4"x4" posts, I am using a 4"x6"x12' post. The post height is 10' from grade.

Is it better to have the hole completely filled with concrete or 1/2 concrete and 1/2 soil? I am leaning towards the all concrete unless there is a good reason not to fill it completely in with concrete.
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Old 02-02-2009, 07:46 PM   #4
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Setting a wooden post in concrete


Not sure what a shade sail fabric is but im assuming its going to create wind resistance in one form or another. By using a larger post you should dig deeper. If its 10 feet tall, you should dig deeper. I would put it at 24 inches deep, fill it to about within 6 inches from grade then backfill with soil. The 4k psi concrete isnt worth much if its not used for compressive strength purposes. Concrete offers no strength laterally unless rebar is used. Just my 2cnts worth.
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Old 02-02-2009, 08:17 PM   #5
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Setting a wooden post in concrete


I have a 25' flagpole they said to bury 18" & a hole 24" across
I fly a 4x6 flag & it hasn't moved
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