Answer: 1 inch
Explanation: Control joints in a 4-inch thick concrete slab should typically be cut to a depth of about 1 inch. This depth helps to weaken the concrete at specific points, allowing it to crack in a controlled manner along the joint lines.
Key considerations for control joints:
1. Spacing: Control joints should be spaced at regular intervals to control where cracking occurs. A common spacing guideline is to place joints at intervals of 2 to 3 times the slab thickness. For a 4-inch thick slab, this would typically mean joints every 8 to 12 feet.
2. Depth: The depth of control joints is crucial. Cutting them to about 1 inch deep ensures that they are effective in controlling cracking while still maintaining the integrity and strength of the slab.
3. Tooling: Control joints are usually formed using a grooving tool or saw shortly after the concrete is poured and begins to harden. This process creates a weakened plane where any potential cracking due to shrinkage or temperature changes is directed.
Properly spaced and deep control joints help to prevent random cracking in concrete slabs, ensuring the longevity and structural integrity of the installation. |
| Midtex Services |
Answer: 1 inch
Explanation: It should be no less then 1/4 of the total thickness of the slab. |
| Infinity Custom Concrete & Construction |
Answer: 1 inch
Explanation: Control joints should be no less 1/4 inch of the total thickness of the slab. |
| Solid Solutions Concrete LLC |
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| ProMatcher |
Answer: Not sure
Explanation: Depends on how big of a joiner you use there, different size, joiners, and different depth levels |
| D&L Concrete LLC |
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 |
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| ProMatcher |
Answer: 1.5 inches
Explanation: Control joints should be cut at a 1.5 inch depth or more. |
| Treasure Coast Concrete Polishing |
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 |
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| ProMatcher |
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 |
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| 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 |