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Cutting concrete ? #7300789
07/06/21 07:18 PM
07/06/21 07:18 PM
Joined: Jun 2012
Posts: 518
kansas
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larrywaugh Offline OP
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larrywaugh  Offline OP
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Joined: Jun 2012
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kansas
I am building a 40 x 60 shop. My neighbor says he can get the saws to cut concrete at work. My question is how deep do we need to cut it it will be five and a half inches and also how big of squares should we cut it in?


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Re: Cutting concrete ? [Re: larrywaugh] #7300805
07/06/21 07:41 PM
07/06/21 07:41 PM
Joined: Mar 2019
Posts: 1,147
Southern NJ
maintenanceguy Offline
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maintenanceguy  Offline
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Southern NJ
If you're talking about control joints to control where the cracks happen: depth - 1/4 the thickness of the slab. spacing - 24x to 30x the thickness of the slab.


-Ryan
Re: Cutting concrete ? [Re: larrywaugh] #7300838
07/06/21 08:19 PM
07/06/21 08:19 PM
Joined: Jun 2012
Posts: 518
kansas
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larrywaugh Offline OP
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larrywaugh  Offline OP
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Joined: Jun 2012
Posts: 518
kansas
That is what I needed to know. Thanks.


Won't take no prisoners,won't spare no lives.
Re: Cutting concrete ? [Re: larrywaugh] #7300842
07/06/21 08:27 PM
07/06/21 08:27 PM
Joined: Jan 2016
Posts: 1,126
Indiana
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concrete man Offline
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concrete man  Offline
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Indiana
Most of the floor I have done called for 1 third the thickness of the pad .for a small floor like this 2 cuts the 40 way 4 cuts the 60 way.

Re: Cutting concrete ? [Re: larrywaugh] #7300844
07/06/21 08:29 PM
07/06/21 08:29 PM
Joined: May 2011
Posts: 1,171
Golconda, IL
nramemb Offline
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nramemb  Offline
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Joined: May 2011
Posts: 1,171
Golconda, IL
use a mask

Re: Cutting concrete ? [Re: larrywaugh] #7300846
07/06/21 08:29 PM
07/06/21 08:29 PM
Joined: Aug 2013
Posts: 173
Iowa
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Mitch L Offline
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Mitch L  Offline
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Iowa
I always thought a rule of thumb was 10x10 pieces

Re: Cutting concrete ? [Re: larrywaugh] #7300852
07/06/21 08:35 PM
07/06/21 08:35 PM
Joined: Jan 2016
Posts: 1,126
Indiana
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concrete man Offline
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concrete man  Offline
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Indiana
Mitch outside should be about 10x10 or no more than12x12. Inside there's not much of freeze thaw cycle.. So cuts can be farther apart.

Re: Cutting concrete ? [Re: larrywaugh] #7300908
07/06/21 09:54 PM
07/06/21 09:54 PM
Joined: Jan 2014
Posts: 3,412
Fontana KS
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Andrew Eastwood Online content
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Andrew Eastwood  Online Content
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Fontana KS
Larry, I would break it in 10ft squares as that figures easily with your slab. I have always been told 1/4 the depth of the concrete is best depth of cut, but our saw is set at 1 1/4 inch so that is what we always do.
Talk to 10 engineers and you will get 10 opinions on how it needs cut though. Had one tell us to cut a slab into 20ft squares a while back and it was just a 4 inch thick slab. crazy Had another tell us to take the thickness of the slab, multiply that by two and you have the feet the cuts should be apart. So 5 1/2 X 2 = 11 ft. On his line of thinking that 4 inch slab should have been cut on 8 ft centers. confused

Re: Cutting concrete ? [Re: larrywaugh] #7300940
07/06/21 10:34 PM
07/06/21 10:34 PM
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Posts: 3,615
uniontown pa
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gutthooked Offline
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uniontown pa
You need to cut it 1/3 of the depth of the concrete and I would cut it in 10' squares. You need to make the green cut as soon as you can get on it without marking the surface.


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Re: Cutting concrete ? [Re: larrywaugh] #7300966
07/06/21 10:59 PM
07/06/21 10:59 PM
Joined: Dec 2006
Posts: 1,699
iowa
bankrunner Offline
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bankrunner  Offline
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iowa
Whenever I cut concrete, I would rather be smaller than larger sections. Less chance for random cracks. You didn't say if a pole building or just monolithic slab. Cracks on inside corners of poles are a pain.

Re: Cutting concrete ? [Re: larrywaugh] #7301296
07/07/21 02:08 PM
07/07/21 02:08 PM
Joined: Jun 2012
Posts: 518
kansas
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larrywaugh Offline OP
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larrywaugh  Offline OP
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kansas
What I'm getting is cut about 1 3/4 deep with about 10 x10 squares as soon as I can walk on it without marking it.


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