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Concrete Slab Question #8632433 07/01/22 02:27 PM
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I just had a 50’ x 70’ concrete slab poured and it has a couple of low spots.

Over a 50’’ span what is acceptable tolerance of deviation?


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Re: Concrete Slab Question [Re: Tbar] #8632466 07/01/22 03:37 PM
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Pretty common standard for most is 1/4” in 10’.

Re: Concrete Slab Question [Re: TX Hntr] #8632609 07/01/22 07:36 PM
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Originally Posted by TX Hntr
Pretty common standard for most is 1/4” in 10’.


Thanks.

Any idea where I could find that in writing?


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Re: Concrete Slab Question [Re: Tbar] #8632623 07/01/22 07:54 PM
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Re: Concrete Slab Question [Re: Tbar] #8632626 07/01/22 07:57 PM
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If you just hired Jose concrete crew you will not find that in writing cheers

Re: Concrete Slab Question [Re: TX Hntr] #8632932 07/02/22 02:43 AM
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Originally Posted by TX Hntr
Pretty common standard for most is 1/4” in 10’.


Local foundation repair companies look for 3/4+ inch over a 20 foot span


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Re: Concrete Slab Question [Re: BigPig] #8633074 07/02/22 02:02 PM
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Originally Posted by BigPig
Originally Posted by TX Hntr
Pretty common standard for most is 1/4” in 10’.


Local foundation repair companies look for 3/4+ inch over a 20 foot span


Boy talk about setting the bar low!!

Re: Concrete Slab Question [Re: Tbar] #8633115 07/02/22 02:34 PM
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If i had a concrete slab poured that was 50x70 and it had some low spots of a quarter inch or more, i would be pissed and asking for it to be done again.

I am no concrete guy, but i am pretty certain foundation repair folks are looking for settling of more than a 3/4 inch difference (if thats the number, i have no reason to suspect it isnt). This is very different than having pockets within the new slab that are just poorly smoothed with low spots.

when you see poor concrete work and good concrete work, it is obvious. I fully expect a slab to have some minor spots of standing water when hosed down, but a quarter inch of depression is a lot, and that is a lot of water (couple of stacked quarters) vs just a minor pooling that isn’t as deep as a single quarter.

For reference, a quarter is 0.06inches thick, so 4 quarters stacked is 1/4 inch thick.

Last edited by Texas buckeye; 07/02/22 02:36 PM.
Re: Concrete Slab Question [Re: fredeboy] #8633141 07/02/22 03:30 PM
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Originally Posted by fredeboy
Originally Posted by BigPig
Originally Posted by TX Hntr
Pretty common standard for most is 1/4” in 10’.


Local foundation repair companies look for 3/4+ inch over a 20 foot span


Boy talk about setting the bar low!!


I’ve seen new construction homes be a 1/2 inch out in that 20 foot span. It’s just a bad form job. I assume this discrepancy is why the foundation repair companies look for 3/4+ before recommending repair.


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Re: Concrete Slab Question [Re: Tbar] #8633143 07/02/22 03:32 PM
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Originally Posted by Tbar
I just had a 50’ x 70’ concrete slab poured and it has a couple of low spots.

Over a 50’’ span what is acceptable tolerance of deviation?



Unless you’re building precision race chassis, I wouldn’t be concerned about 1/4 inch over 50 feet. It won’t hold water and probably won’t be noticeable once walls are up and it’s filled with stuff.


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Re: Concrete Slab Question [Re: Tbar] #8633715 07/03/22 03:55 PM
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Just didn't like the elongated area at the top and the circular area top right. Neither are 1/4" low but are just 1/16th shy of it.

The other spots are negligible.

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Re: Concrete Slab Question [Re: Tbar] #8633722 07/03/22 04:18 PM
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I wouldn't worry about that - once it is framed and finished out you won't notice that. If your outside walls are good and level you're good.

Plus that concrete lives and breathes for at least a month before it is considered fully cured.


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Re: Concrete Slab Question [Re: Tbar] #8633819 07/03/22 08:11 PM
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What kind of soil slab poured on? They drill pillars around perimeter and load bearing walls?

Re: Concrete Slab Question [Re: Tbar] #8633942 07/04/22 12:05 AM
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Flooring company for vinyl plank says 3/8 inch for 10 foot radius. They use a leveling compound to bring to spec.

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