What is a Concrete Contraction Joint?Concrete contraction joints are small pieces of plastic that are put in place to control and lessen cracking that occurs in concrete over time. These joints are placed on the edges of a slab of concrete where there is already minor cracking to stop the spread of the cracking. | | By ProMatcher Staff | | Updated: 06/18/2018 | | | Concrete contraction joints are small pieces of polyethylene plastic that are put in place to control and lessen cracking that occurs in concrete over time. These joints are placed on the edges of a slab of concrete where there is already minor cracking to stop the spread of the cracking.
By putting these joints in place, the cracking is controlled and allowed to crack across the slab in a straight line as opposed to spreading and cracking throughout the slab. Joints can be put in place after a crack has already formed to prevent random cracking or put in place before cracking begins to minimize risk.
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