Pouring concrete in existing structure - DFWstangs Forums
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 07-30-2009, 10:30 AM Thread Starter
Num say'n? (tm)
 
JP135's Avatar
 
Join Date: May 2006
Posts: 5,702
Pouring concrete in existing structure

Lemme 'axe' you guys something:

The place we're moving to has a 24 x 24 garage. It's built like a pole barn and has a dirt floor. I'm wondering about excavating the dirt floor and pouring a floor.

Has anyone done this?

Would you pour the floor inside the walls and leave the perimeter posts set in dirt or would you remove a couple of feet at the bottom of the walls and pour so that the concrete encircles the existing posts?

DFWMustangs.net
JP135 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 07-30-2009, 11:53 AM
DFWMUSTANGS.NET
 
Join Date: Jun 2009
Location: Mesquite
Posts: 2,079
A couple of feet down isn't really going to make a huge difference on the posts, imo. You also have to think about the structural integrity, or the lack thereof, if you have all of them dug up at one time to pour the concrete. I honestly don't think you will be disappointed if you just pour a concrete slab floor within the perimeter. How thick are you wanting this floor to be? What strength(psi) concrete are you looking at using? Steel rebar?
Lone Sailor is offline  
post #3 of 8 (permalink) Old 07-30-2009, 12:54 PM Thread Starter
Num say'n? (tm)
 
JP135's Avatar
 
Join Date: May 2006
Posts: 5,702
It's going to be a combo garage/shop. There will probably be jack-stands, jacks, but I don't plan to have a four-post lift or anything huge. Def will use rebar. I haven't gotten too far into it as far as what strength concrete. I'm figuring a 4" slab.

DFWMustangs.net
JP135 is offline  
 
post #4 of 8 (permalink) Old 07-30-2009, 01:04 PM
Lifer
 
Join Date: Nov 2001
Location: Ellis County
Posts: 18,368
Quote:
Originally Posted by Lone Sailor View Post
A couple of feet down isn't really going to make a huge difference on the posts, imo. You also have to think about the structural integrity, or the lack thereof, if you have all of them dug up at one time to pour the concrete. I honestly don't think you will be disappointed if you just pour a concrete slab floor within the perimeter. How thick are you wanting this floor to be? What strength(psi) concrete are you looking at using? Steel rebar?
Hell, yeah. It would be fine, and save you a lot of work and expense.

CHL holder and Conservative...AKA "Domestic Terrorist"
Vertnut is offline  
post #5 of 8 (permalink) Old 07-30-2009, 01:33 PM Thread Starter
Num say'n? (tm)
 
JP135's Avatar
 
Join Date: May 2006
Posts: 5,702
Quote:
Originally Posted by Lone Sailor View Post
You also have to think about the structural integrity, or the lack thereof, if you have all of them dug up at one time to pour the concrete.
See, that's been on of the things that stuck in my head - you strip the walls then dig down. The roof weight and any windy conditions while the work is taking place are liable to add up to a structural failure.

Quote:
Originally Posted by Vertnut View Post
Hell, yeah. It would be fine, and save you a lot of work and expense.
I'm all about saving work and expense.

DFWMustangs.net
JP135 is offline  
post #6 of 8 (permalink) Old 07-30-2009, 04:31 PM
DFWMUSTANGS.NET
 
Join Date: Jun 2009
Location: Mesquite
Posts: 2,079
Quote:
Originally Posted by JP135 View Post
It's going to be a combo garage/shop. There will probably be jack-stands, jacks, but I don't plan to have a four-post lift or anything huge. Def will use rebar. I haven't gotten too far into it as far as what strength concrete. I'm figuring a 4" slab.
3 1/2" - 4" seems to be the standard for driveways and garages, so that should be fine for what you're wanting to do. 3000 psi concrete is what I would use. I'm sure there are others that have had good luck with 2000 or 2500, but I like to have the strength without the added concern of cracking. I would read up on or call your city or county offices to find out if they have a spec on garage floor slabs so that you can be compliant if you so choose. Now you are always going to have micro cracking with any concrete, but proper preparation can go a long way in extending the life of the surface. The key is to make sure the native ground beneath the concrete is compacted well, and evenly. You can also install an under slab drain. Most will install a center surface level drain any way, so make sure you plan that out ahead of time. Also make sure you have the rebar set at least 1" above your native ground, or 1" into the underside of the slab. I always go with 12" on center, but it depends on big the bar is and how cheap you want to do it. Granted, the further away the bars are, the higher the chances you have of getting slumps.
Lone Sailor is offline  
post #7 of 8 (permalink) Old 07-30-2009, 04:50 PM Thread Starter
Num say'n? (tm)
 
JP135's Avatar
 
Join Date: May 2006
Posts: 5,702
Gotcha. Thanks for the info.

I think I'll plan on butting the forms against the existing posts and save some serious labor/money.

DFWMustangs.net
JP135 is offline  
post #8 of 8 (permalink) Old 07-30-2020, 03:43 PM
Punk Ass Newbie
 
Join Date: Jul 2020
Posts: 2
If you are planning on a new floor whilst removing the old one, I would suggest you to use some dark colored stamped concrete. It would make the oil stains less visible as well as bring in a new look to your garage.
Tyler Corona is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the DFWstangs Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome