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

0.25 inches
12%
0.5 inches
22%
1 inch
37%
1.5 inches
10%
2 inches
10%
Not sure
7%
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Question: How deep should the control joints be in a 4-inch thick concrete slab?
Top Answer (37% of 40 votes): 1 inch.

Answer: 0.25 inches
Explanation: That is proper procedure.
RP Enterprises
Answer: 1 inch
Explanation: They need to be 1/4 depth of slab.
Elite Concepts
Answer: 1 inch
Explanation: I know that control joints do not prevent cracks and its important to put your cuts in the right locations to minimize cracking.
COMMON SENSE FLOORING, INC.
ProMatcher
Answer: 1 inch
Explanation: No more than 25% of the slab thickness.
Cronin Construction & Resource Management, LLC
Answer: 1 inch
Explanation: ACI recommends control joint depth equal to 1/4 of the slab thickness.
Maven Group LLC
Answer: 1 inch
Explanation: Control joints should be 1/4 of the thickness of the concrete slab.
QUALITY CONTRACTORS
ProMatcher
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
Answer: Not sure
Explanation: Depends on the thickness of the slab.
BellPro Construction LLC
ProMatcher
Answer: 0.25 inches
Explanation: .25 inch to a half inch. This can vary.
Southern Quality Concrete
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