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Old 09-02-2014, 01:07 PM
Yannick's Avatar
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Location: Gloucester, VA
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Default Crack in structural slab. Bummer.

This morning I took a little tour around the oven and found a crack on the structural slab of the base, under the vermicrete.
Slab is 3.5" and rebar reinforced. The Vermicrete is 4".
I have a crack on the left and right side of the slab (see picture)
Picture1: crack on left side of slabCrack in structural slab. Bummer.-14933503419_4f0088ab98_h.jpg
Picture2: crack on right side of slabCrack in structural slab. Bummer.-14933508069_a007baa6d7_h.jpg
picture3: crack on the right of the oven opening. I keep adding stucco but the crack still shows up.Crack in structural slab. Bummer.-14933639638_febe6e142d_h.jpg
Picture4: crack on stucco side.Crack in structural slab. Bummer.-15119825442_e86644b33b_h.jpg

My course of action for the slab is to build up a wall inside the base, in the middle, to support the slab. (maybe going from the back wall of the base towards the front for half the length of the inside .Crack in structural slab. Bummer.-13973189983_c3997fdcab_h.jpg
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  #2  
Old 09-02-2014, 03:18 PM
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Location: Bucks County, PA
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Default Re: Crack in structural slab. Bummer.

Puzzling....

Unless there are cracks in your foundation, I am thinking that your front wall/brick arch might be weak. Rather than the arch, a concrete lintel might have been better.

Not sure if your support wall is best solution. The cracks may just be minor stress cracks and as long as they don't get worse, you might be ok. However, am curious why stucco keeps cracking, which would indicate that it is still moving.

Maybe a concrete expert will chime in here.....
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Old 09-02-2014, 03:25 PM
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Default Re: Crack in structural slab. Bummer.

Quote:
Originally Posted by Yannick View Post
This morning I took a little tour around the oven and found a crack on the structural slab of the base, under the vermicrete.
Slab is 3.5" and rebar reinforced. The Vermicrete is 4".
I have a crack on the left and right side of the slab (see picture)
Picture1: crack on left side of slabAttachment 44464
Picture2: crack on right side of slabAttachment 44465
picture3: crack on the right of the oven opening. I keep adding stucco but the crack still shows up.Attachment 44466
Picture4: crack on stucco side.Attachment 44467

My course of action for the slab is to build up a wall inside the base, in the middle, to support the slab. (maybe going from the back wall of the base towards the front for half the length of the inside .Attachment 44468
Firstly I do not believe the cracks are structural but most likely shrinkage cracks if the slab was sagging the top would be in compression and the cracks in the underside of the slab. I would not be concerned I suggest that you just cut them out with an angle grinder and fill with a good sealant or do nothing
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Old 09-02-2014, 03:42 PM
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Default Re: Crack in structural slab. Bummer.

The foundation is not cracked.
Just the slab beneath the oven.
I cannot see if it is cracked underneath because i still have the backer board.
I haven't noticed the slab cracks before the fire started.
I might grind them and patch them estheticaly but i think I will still add those blocks underneath the slab.
I thought about doing it during the contribution but I thought all those rebars should hold up. Better safe then sorry.
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Old 09-02-2014, 04:20 PM
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Default Re: Crack in structural slab. Bummer.

Those are not shrinkage cracks in the slab.
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Last edited by NCMan; 09-02-2014 at 05:08 PM.
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Old 09-02-2014, 11:50 PM
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Default Re: Crack in structural slab. Bummer.

Quote:
Originally Posted by NCMan View Post
Those are not shrinkage cracks in the slab.
Wondering how you are so sure about that?

Looking at a pic of his full oven, if the cracks are on the right and left side of the oven, and there are no cracks in the foundation, I don't see how it would be any sign the concrete is failing. I also don't see how a wall at the center of the oven would help.
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Old 09-03-2014, 04:41 AM
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Default Re: Crack in structural slab. Bummer.

Yannick,
Not sure what is going on with your support slab but here is a post I posted a while back. It may help you understand why your getting cracks in the dome stucco. A very informative article on the stucco process.

Quote:
Originally Posted by kbartman View Post
Glad to see your enjoying your oven. I've been enjoying mine also.

Did you finish your stucco yet? Hope to start my stucco process soon. I been doing some research on the process. Attached is article on best practices if you are interested it was quite a eye opener for me glad I read it before I attempted anything. I hope your still in the planning process.

Too big to post the pdf file here's a link http://c.ymcdn.com/sites/www.nibs.or..._011_WB4-2.pdf
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Old 09-03-2014, 06:04 AM
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Default Re: Crack in structural slab. Bummer.

Quote:
Originally Posted by deejayoh View Post
Wondering how you are so sure about that?

Looking at a pic of his full oven, if the cracks are on the right and left side of the oven, and there are no cracks in the foundation, I don't see how it would be any sign the concrete is failing. I also don't see how a wall at the center of the oven would help.
I have about 40 years of hands on experience w/concrete and masonry and know what a shrinkage crack looks like. And no, a wall placed there now will be of little help, except to keep it from collapsing. With that span, in my opinion, a block support wall should have been built there from the start. My one question I have is.....how long did he leave the forms on supporting the slab underneath after it was poured? They should have been left on for a minimum of 28 days underneath. I'd have left them on for the whole build, if they were not in my way. A crack, simply by the location, size, direction and appearance can tell you an awful lot about what is going on. As I said, the slab cracks are not from shrinkage. For one thing, shrinkage cracks appear right away, not later on. I'm not there and cannot offer much more, other than seeing the pictures that I've seen.
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Old 09-03-2014, 06:19 AM
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Default Re: Crack in structural slab. Bummer.

Does this crack run from side to side or front to back?
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Old 09-03-2014, 06:50 AM
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Default Re: Crack in structural slab. Bummer.

The crack appears to run from side to side only.
The support might have stayed underneath the slab for maybe a week or so.
My idea to put blocks underneath is indeed to prevent collapsing if it comes to that.
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