Would 3 Or 4 Yards Of Concrete Cover A 12x20 Garage? - Concrete, Stone & Masonry - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Would 3 or 4 yards of concrete cover a 12x20 garage?
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

12-18-2012, 05:04 PM   #1
Member

Join Date: Sep 2011
Location: Montgomery,AL
Posts: 204
Rewards Points: 150

## Would 3 or 4 yards of concrete cover a 12x20 garage?

I am wondering would 3 or 4 yards of concrete cover a 12x20 garage foundation with a 12''x12'' footing?

12-18-2012, 05:07 PM   #2
Master General ReEngineer

Join Date: Dec 2007
Location: Chaumont River, Ny.
Posts: 6,615
Rewards Points: 1,636

Ayuh,... Do the math,... a yard of concrete is 27 cu. ft....

12'x 20'x how many inches,..??

 12-18-2012, 05:13 PM #3 Civil Engineer   Join Date: Mar 2009 Location: Boston Posts: 5,638 Rewards Points: 4,856 For the footing, each linear foot requires 1 cubic foot of concrete. You have 60 linear feet of footer, hence 60 cubic feet required there. The slab is 240 square feet, so for a 4 inch thick slab you would need an additional 80 cubic feet of concrete, for a total of 140 cubic feet, which is a little over 5 cubic yards. Due to spillage and waste, best to order 6 yards of concrete. Unless of course your slab is not 4 inches thick, in which case you need to modify the computations.

 12-18-2012, 05:18 PM #4 Member   Join Date: Sep 2011 Location: Montgomery,AL Posts: 204 Rewards Points: 150 Yes the slab is 4'' thick.
 12-18-2012, 06:53 PM #5 Member   Join Date: Nov 2011 Location: Hartfield VA Posts: 34,442 Rewards Points: 14,014 I personaly would never suggest anyone DIY there own slab. Seems ike a simple job, but it's not. It's a one shot deal, once that truck pulls in there is not do over or just make it work. Even the lay out, footings, height of the slab, the slope toward the front can be tricky. Have you taken into consideration that the bottom row of siding needs to be at least 6" off of grade? Have you concidered using stem wall constrution?
 The Following User Says Thank You to joecaption For This Useful Post: concretemasonry (12-18-2012)
 12-18-2012, 07:30 PM #6 journeyman carpenter     Join Date: Sep 2011 Location: nova scotia canada Posts: 3,315 Rewards Points: 1,248 4" slab on a 12 x20 works out to .3333x12x20 / 27 +10%= 3.256 yrds round up to 3.5 yrds if you can get 1/2 yrd ordered otherwise get 4
 12-18-2012, 09:20 PM #7 Member     Join Date: Oct 2006 Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074 Posts: 4,068 Rewards Points: 2,626 Better to order too much since concrete is not that costly once you reach the minimum delivery amount. Nothing is worse than coming up short if you did not have base under the slab graded as accurately as you want you pencil will be in figuring costs in advance. Plan ahead and make sure you have something formed in advance that you ultimately need - sidewalk, apron, etc. to use up any excess. Much better than just dumping it in the wrong place. the biggest mistake with concrete pours is to not have enough (poor concrete job with cold joints) or enough help to place it quckly if the weather turns. - Also have protection for rain or snow. Dick
 12-18-2012, 09:27 PM #8 Member   Join Date: Sep 2011 Location: Montgomery,AL Posts: 204 Rewards Points: 150 I understand that pour concrete is not a DIY job, thats why I thought about doing a wooden floor.
 12-18-2012, 09:49 PM #9 Member   Join Date: Sep 2011 Location: Montgomery,AL Posts: 204 Rewards Points: 150 I figure it was 4 yards.
12-18-2012, 10:00 PM   #10
Ole Wood Worker

Join Date: Sep 2008
Location: Chattanooga, Tennessee
Posts: 10,512
Rewards Points: 546
Blog Entries: 1

Quote:
 Originally Posted by CJIII I figure it was 4 yards.
CJ, It would be a little over 3.5 yds for just the slab, but you said you were pouring 12X12 footings so you will need at least 6 yds like Daniel said.
__________________

If you do what you've always done, you'll get what you've always got.

http://www.woodworkingtalk.com/forum.php

Jim

 The Following User Says Thank You to BigJim For This Useful Post: PaliBob (12-19-2012)
 12-18-2012, 10:20 PM #11 JOATMON     Join Date: Aug 2011 Location: S. California Posts: 11,406 Rewards Points: 1,968 Blog Entries: 2 Are you pouring that with a totally flat floor? No stem wall? For reference, my floor is 20x25....it took 20 yards of concrete.....oh, the footing is 18"w x 24" deep and has an 8"h x 6"w stem wall all the way around. I love that part...it gets my walls at least 8" above the ground and on the inside....all my cabinets sit on the lip of the stem wall anchord to studs....nothing touches the floor....makes it easy to wash out the floor. If you want to see pic....click on the garage build link in my signature. __________________ Even if you are on the right track, you will still get run over if you just sit there. My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
 The Following User Says Thank You to ddawg16 For This Useful Post: PaliBob (12-19-2012)
 12-18-2012, 11:07 PM #12 Member   Join Date: Sep 2011 Location: Montgomery,AL Posts: 204 Rewards Points: 150 Ok thanks!
 12-18-2012, 11:10 PM #13 Member   Join Date: Sep 2011 Location: Montgomery,AL Posts: 204 Rewards Points: 150 The reason I wont concrete is that I will be using the garage as a woodworking shop!
 12-18-2012, 11:18 PM #14 Member   Join Date: Nov 2011 Location: Hartfield VA Posts: 34,442 Rewards Points: 14,014 Going to be tight in that small an area trying to use it for a wood working shop. Have you done a simple lay out on some graft paper to see how it's going to look. Just been there far to many times. Built the garage, moved eveything in, find out it's to small and have to go back to working outside.
12-18-2012, 11:29 PM   #15
Member

Join Date: Sep 2011
Location: Montgomery,AL
Posts: 204
Rewards Points: 150

I know its small but my current shop is 10x12 shed.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post gopherdad Building & Construction 3 07-30-2011 01:23 PM homeowner12 Building & Construction 19 07-07-2010 09:37 PM Niffumdutz Building & Construction 5 02-19-2010 08:31 PM dmj245 Building & Construction 13 05-31-2006 04:13 AM Aqua-Man Building & Construction 2 06-17-2005 01:11 PM

Top of Page | View New Posts