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 07-08-2009, 09:29 PM   #1
Member
 
Join Date: Dec 2008
Location: Dayton Ohio Area
Posts: 670
Rewards Points: 0
Share |
Default

Concrete Slab Pour - 35 Yards


I am prepping my barn to have the floor poured.

I am going to have 4000 psi concrete poured to a depth of approximately 4".

The size of the floor is 40' x 68'

My question is wether to pay the extra $210 for fiber and not utilize any wire mesh OR; forgo the fiber and do wire mesh.

My thought is to go with wire mesh as it will help keep the concrete together should (when) a crack develops.

While the fiber does increase the holding strength, it does no good after a crack has formed as there is nothing to hold the two pieces together.

Also, for a barn floor, is it necessary to put down vapor barrier.

__________________
-Andrew
DIY hobbiest
AndrewF is offline   Reply With Quote
Old 07-08-2009, 10:35 PM   #2
Concrete & Masonry
 
Join Date: Nov 2008
Location: Wisconsin
Posts: 2,720
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


Andrew, as a contractor, I do utilize the cost effectiveness of fibers quite often, but NEVER rely on them completly. I personally hate rolled mesh, & the tetanous shots that would come with it regularily. The only time I will use mesh is when it is clearly speced, & then I will only use sheet mesh, which is about 8' by 15'. Far easier/faster to handel, but a real PITA to haul/pick-up on a daily basis. I have run the numbers many times, & always find that installing 3/8" rebar on 4' centers each way saves us time & money, & when used w/ fibers, offers a far superior re-enforcement in the long run. In short, fibers alone wont be sufficient IMO. Remember, with concrete, you have one opportunity to get it right. As for the vapor barrier, it depends on the use of the barn. It should cost about the same as the fiber cost for the material. In humid weather, it should cut most, if not all floor "sweating", which may be a big plus depending on the use of the barn.

jomama45 is online now   Reply With Quote
Old 07-09-2009, 06:06 AM   #3
Member
 
Join Date: Dec 2008
Location: Wilmington, DE
Posts: 3,118
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


And don't forget control joints. Concrete will crack, but you can usually tell it where to crack. And I would use a moisture barrier, might even consider some foam insulation.
Just Bill is offline   Reply With Quote
Old 07-09-2009, 01:20 PM   #4
Member
 
Join Date: Dec 2008
Location: Dayton Ohio Area
Posts: 670
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


I was going to use the wire mesh sheets. I used them in my last barn.

The barn is mostly to be used to store equipment, park my truck in at night and a workshop for repairs and other projects that are too dirty for the house garage.

Unfortunately, cost is a concern, like most projects. I don't mind doing it right, but I still have to manage the costs.

Yes, control joints will be done.
Attached Thumbnails
Concrete Slab Pour - 35 Yards-barn.jpg  
__________________
-Andrew
DIY hobbiest

Last edited by AndrewF; 07-09-2009 at 01:46 PM.
AndrewF is offline   Reply With Quote
Old 07-09-2009, 02:47 PM   #5
SNC
Member
 
Join Date: Dec 2008
Location: MD
Posts: 150
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


I do not believe in doing any concrete without using steel or wire or both
SNC is offline   Reply With Quote
Old 07-09-2009, 05:16 PM   #6
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


Don't forget underground conduit for wiring, looks like you don't have it yet. And plumbing supply to keep that truck clean. lol
Be safe, G
Gary in WA is offline   Reply With Quote
Old 07-09-2009, 07:26 PM   #7
Member
 
Join Date: Jul 2008
Location: Canada (s/w ON.)
Posts: 2,294
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


Moisture in frozen concrete can/will cause cracking!
I would lay plastic down before the pour.
I did this with my garage back in 1978. The garage is unheated and sometime the temp goes down to 10F. It has never cracked anywhere. I used 4" mat reinforcing, with rebar around the perimeter.
Wildie is offline   Reply With Quote
Old 07-10-2009, 07:33 AM   #8
Member
 
RippySkippy's Avatar
 
Join Date: Feb 2007
Location: Ames, Iowa
Posts: 1,233
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


I second the vapor barrier...it will virtually stop the sweating in the spring...for the few $, I never pour any concrete except exterior, with out it.
__________________
when it comes to breakfast, the chicken is dedicated, the pig is committed.
LMASD
RippySkippy is offline   Reply With Quote
Old 07-10-2009, 08:45 AM   #9
Registered User
 
Termite's Avatar
 
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


Fiber's great, but treat it as a supplement to mesh or rebar reinforcement. It just isn't an alternative to it. I think I'd opt for 6" welded wire mesh and call it good.

As Rippy said, vapor barrier is a very good idea even though the barn isn't habitable. It'll help reduce moisture transmission.
Termite is offline   Reply With Quote
Old 07-10-2009, 10:13 AM   #10
Civil Engineer
 
Join Date: Mar 2009
Location: Boston
Posts: 4,203
Rewards Points: 2
Default

Concrete Slab Pour - 35 Yards


This is a 4 inch thick slab, as such you cannot achieve even the minimum recommended cover over rebar. Further, the rebar would have to be placed at the center, which is useless from a structural standpoint, i.e. the rebar is at the neutral axis of the concrete, hence adds no strength to the slab. At best, rebar would act as minimal temperature reinforcing, and might reduce cracking somewhat.

I agree that mesh is a PITA, further no contractor ever supports it properly, so it winds up at the bottom of the pour, doing absolutely nothing except costing money and time.

I happen to like fiber reinforced concrete, for a relatively small premium, you get a mix that is more likely to resist cracking, but no concrete pour is crack free.

The most important considerations are proper preparation of the base, it must drain correctly, and be adequately compacted to support the slab. Also, you need control joints correctly installed. They do not stop cracking, they simply concentrate the cracks inside the joint, where the cracking is not objectionable. I also agree that a vapor barrier under the slab is a good idea, 6 mil polyethylene is typical, but there are alternatives.

For my money, the most important concerns should be foundation preparation, vapor barrier, high quality concrete, proper curing and finishing. I would not include any steel in the concrete, I would use fibers, for the reasons noted above. For a four inch slab, steel adds nothing, only costs money.
Daniel Holzman is online now   Reply With Quote
Old 07-10-2009, 11:16 AM   #11
Member
 
Join Date: Dec 2008
Location: Dayton Ohio Area
Posts: 670
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


Thanks for the input.

The floor will have drains over each bay (4), over where the freeze proof faucet is, and a stub up for a future wash sink near the water faucet. I put a 6" PVC pipe around the freeze proof faucet so that if(when) I ever have to repair or replace it, I can without jack hammering the cement around it up. It sits about 6" from the outside wall, so I can dig outside down to it.

I already ran the 1 1/2" conduit in for the electrical service as well as ran a spare 1 1/4" to the house for future and then also buried two cat5e (outdoor) and 2 RG6 cables from the house to the barn and stubbed them up in PVC as well.

On my last barn, I used 6"x"6 mesh. We used j hooks and pulled it up as we did the pour, being careful to not walk on it too much and push it back down. Yes, I am sure some of it sunk back to the bottom. I did NOT order fiber for this pour.

The first two photos are for this project.

The last photos are from the barn I built in 2006 at my old house.
Attached Thumbnails
Concrete Slab Pour - 35 Yards-barn-electric2.jpg   Concrete Slab Pour - 35 Yards-water-barn.jpg   Concrete Slab Pour - 35 Yards-oldbarncement.jpg   Concrete Slab Pour - 35 Yards-oldbarncement2.jpg   Concrete Slab Pour - 35 Yards-oldbarncement3.jpg  

Concrete Slab Pour - 35 Yards-oldbarncement4.jpg  
__________________
-Andrew
DIY hobbiest

Last edited by AndrewF; 07-10-2009 at 11:20 AM.
AndrewF is offline   Reply With Quote
Old 07-10-2009, 11:19 AM   #12
Member
 
Join Date: Dec 2008
Location: Dayton Ohio Area
Posts: 670
Rewards Points: 0
Default

Concrete Slab Pour - 35 Yards


Also, should I have them apply a curing agent to it at the time of the pour?

I plan on armosealing it about a month later and I didnt know if the acid I have to use to clean the floor would not work well with the curing agent.

__________________
-Andrew
DIY hobbiest
AndrewF 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
How to cut a hole in a concrete floor slab tomseeley General DIY Discussions 7 06-10-2009 02:32 PM
Question on Monolithic slab - Pour all at once? seth Building & Construction 15 05-06-2009 03:36 PM
Extending Concrete Patio Slab bobo Building & Construction 6 04-17-2008 12:17 PM
Filling hole in carport (concrete slab) chaddihimself Building & Construction 2 08-10-2007 12:50 PM
Concrete slab weeps moisture dale h Flooring 2 04-30-2005 10:29 AM




Top of Page | View New Posts

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