Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Landscaping & Lawn Care

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-01-2009, 11:03 PM   #1
Member
 
Join Date: Jan 2008
Posts: 266
Share |
Default

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?

JackOfAllTrades is offline   Reply With Quote
Old 02-02-2009, 08:04 AM   #2
Master General ReEngineer
 
Bondo's Avatar
 
Join Date: Dec 2007
Location: Chaumont River, Ny.
Posts: 3,673
Default

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.....

Bondo is offline   Reply With Quote
Old 02-02-2009, 02:52 PM   #3
Member
 
Join Date: Jan 2008
Posts: 266
Default

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.
JackOfAllTrades is offline   Reply With Quote
Old 02-02-2009, 06:46 PM   #4
Newbie
 
Join Date: Jan 2008
Posts: 7
Default

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.
charlesmd is offline   Reply With Quote
Old 02-02-2009, 07:17 PM   #5
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

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
Scuba_Dave is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bad Concrete in Fence Post Holes - Advice? bcrenshaw Building & Construction 2 08-24-2008 11:21 AM
Deck Beam connection to Post? CNJHomeowner Building & Construction 7 08-08-2008 06:14 AM
Concrete piers for post & beam foundation jpecor Building & Construction 1 08-01-2008 12:27 PM
Cold Weather Concrete in Post Hole OK?? Jerrycast Building & Construction 6 01-25-2008 09:47 AM
setting post straight econdave Building & Construction 5 06-17-2006 12:20 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.