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Old 06-04-2012, 07:24 AM   #1
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monolithic and joints


If I were to pour a 14 x 24 slab with thickened edges would it require control joints? This would be for an out building that would be finished out as a normal occupied room, sort of a de-tached room.

Reason I ask is it seems like when I see slabs finished for residential construction I don't see joints going in, and in my home I found no joints.

In our area what would be a good dimension for the thicker edges and slab? It rarely freezes here, no heaving.

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Old 06-04-2012, 10:33 AM   #2
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If I were to pour a 14 x 24 slab with thickened edges would it require control joints? This would be for an out building that would be finished out as a normal occupied room, sort of a de-tached room.

Reason I ask is it seems like when I see slabs finished for residential construction I don't see joints going in, and in my home I found no joints.

In our area what would be a good dimension for the thicker edges and slab? It rarely freezes here, no heaving.

Control/contraction joints should be sawed or hand tooled in a slab of any size,and the spacing for a slab is determined by the thickness of said slab, a good rule of thumb for your area would be 2 times the thickness of your slab in feet, and if you really want to get picky 3 times the thickness would work also,just depends on who you ask,American concrete inst. or Portland cement association.

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Old 06-04-2012, 11:29 AM   #3
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monolithic and joints


I would never tool a joint on a slab but i would most def saw cut 2 joints in your slab both right down the middle so they intersect in the middle.
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Old 06-05-2012, 06:50 AM   #4
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monolithic and joints


If saw cut, how deep? Is there a ratio related to slab thickness?

And if there is a ratio related to slab thickness, does the saw cut need to get deeper over the thickened edges of the slab?
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Old 06-05-2012, 09:38 AM   #5
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If saw cut, how deep? Is there a ratio related to slab thickness?

And if there is a ratio related to slab thickness, does the saw cut need to get deeper over the thickened edges of the slab?


The rule of thumb is 25% of the slab thickness,so a 4 inch slab would be 1 inch,and the cut doe's not get deeper at the edges, for your's i would make a cut 8 feet in from the edge of the 24 foot measurment at each end,and one cut down the center of the 14 foot.
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