Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-20-2011, 01:29 PM   #1
Newbie
 
Join Date: Mar 2011
Posts: 17
Share |
Default

Formula for concrete foundation, rebar?


I would like to build a 20 x 20 shed out back to cover my tractor. I have 9 steel posts that I can use to support the roof. I’m thinking I will bolt the poles onto the foundation. I will poor a cement floor inside the foundation.

Is there a formula that is used to determine how much concrete you need for the post foundation and what size and quantity of rebar? (That information I will possibly use to tackle a larger building later.)

My steel posts will require some grinding cutting and welding. I have four that are 11’ and are ¼”. The other posts are heavy 4” pipe.

Is it more practical and easier just to use 4x6 wood posts? I feel like I will need to get permits if I use steel and if I use wood I won’t have to.

The soil has a lot of clay.

Thanks for your opinions

Daulton is offline   Reply With Quote
Old 03-20-2011, 02:41 PM   #2
Member
 
concretemasonry's Avatar
 
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,731
Default

Formula for concrete foundation, rebar?


Do you have a plan on what to do for lateral strength of the shed if the wind decides to blow? This will affect the depth and width of the foundation and what kind of connection you propose between the post and the footing.

You can easily set the posts for the vertical loads, but lateral loads must be resited by the structure itself, especially with clay that may be wet occasionally.

The need for permits should not have any bearing on whether you need permits in most of the developed world.

since you are doing a "seat of the pants" design, do not expect a canned design to work for something more significant.

concretemasonry is online now   Reply With Quote
The Following 2 Users Say Thank You to concretemasonry For This Useful Post:
Daulton (03-20-2011), Willie T (03-20-2011)
Old 03-20-2011, 03:03 PM   #3
Newbie
 
Join Date: Mar 2011
Posts: 17
Default

Formula for concrete foundation, rebar?


My plan is to use ten foot long 4 x 6 header on top of the verticle posts. Rafters would be 2 x 8 constuction. I think I've talked myself into wood constuction. On the foundation I would put treated wood tied down with anchers every how many inches is customary.

I have to go to the planning department anyway about an electrical line, so I guess I should draw this up and take it down there.
Daulton is offline   Reply With Quote
Old 03-20-2011, 10:56 PM   #4
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Default

Formula for concrete foundation, rebar?


Quote:
Originally Posted by Daulton View Post
My plan is to use ten foot long 4 x 6 header on top of the verticle posts. Rafters would be 2 x 8 constuction. I think I've talked myself into wood constuction. On the foundation I would put treated wood tied down with anchers every how many inches is customary.

I have to go to the planning department anyway about an electrical line, so I guess I should draw this up and take it down there.
Yep.
__________________
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Willie T
Willie T is offline   Reply With Quote
Reply

Tags
concrete, formula, foundation, steel frame


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
rebar in foundation bluebird5 Building & Construction 13 02-02-2011 09:33 AM
# of rebar in cinder block wall johnlvs2run Building & Construction 3 08-08-2010 10:48 AM
Foundation Repair Help rasilun Remodeling 1 10-15-2009 10:26 PM
Rebar for Monolithic Slabs portert0224 Building & Construction 1 07-03-2008 11:37 PM
Rebar Placement in a 3x3 concrete pad. Top, bottom or middle? Deck Building & Construction 32 05-11-2008 08:44 AM




Top of Page | View New Posts

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