What is the purpose of having a construction joint?

The purpose of having a construction joint is primarily to resume work on concrete slabs. Construction joints are installed in concrete structures when the concrete placement must be stopped and then continued at a later time. This type of joint allows for the continuation of work without compromising the structural integrity of the concrete.

When concrete is poured, it sets and hardens over time. If the work is halted and a joint is not created, there could be issues with weak points in the concrete where it resumes, leading to potential structural problems. By incorporating construction joints, builders ensure that the new concrete effectively bonds with the existing set concrete, thereby maintaining the overall strength and durability of the structure.

In contrast, connecting different materials would typically involve expansion joints or other types of joints that cater specifically to those needs. Improving insulation and controlling moisture would be related to other construction techniques and materials but are not the primary functions of construction joints.