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How deep should the control joints be in a 4-inch thick concrete slab?

0.25 inches
14%
0.5 inches
25%
1 inch
32%
1.5 inches
10%
2 inches
7%
Not sure
10%
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Question: How deep should the control joints be in a 4-inch thick concrete slab?
Top Answer (32% of 28 votes): 1 inch.

Answer: 0.25 inches
Explanation: All control joint depths must be a minimum of 1/4 the thickness of the slab. This is non-negotiable.
Colorado Concrete
Answer: 1 inch
Explanation: I always prefer do it at 1" deep
alvaradomasonry
Answer: 1 inch
Explanation: Usually one third of the thickness.
Concrete services
ProMatcher
Answer: 1 inch
Explanation: Contraction joints should be straight and continuous
Black Dirt Services LLC
Answer: 0.25 inches
Explanation: .25 inch to a half inch. This can vary.
Southern Quality Concrete
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