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

0.25 inches
10%
0.5 inches
21%
1 inch
40%
1.5 inches
10%
2 inches
8%
Not sure
8%
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Question: How deep should the control joints be in a 4-inch thick concrete slab?
Top Answer (40% of 37 votes): 1 inch.

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.
Answer: 1.5 inches
Explanation: Control joints should be cut at a 1.5 inch depth or more.
Treasure Coast Concrete Polishing
ProMatcher
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
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
ProMatcher
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
Answer: 1 inch
Explanation: Contraction joints should be straight and continuous
Black Dirt Services LLC
ProMatcher
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