When repairing cold joints, proper ventilation and the use of personal protective equipment (PPE) such as gloves, goggles, and a respirator are essential. A cold joint in concrete is an area or surface with a structural discontinuity caused by the delayed concrete pouring between two layers of concrete. Cold joints occur when concrete is poured in two or more stages, and the initial pour has already begun to set before the next pour is added. Time to break down the details. Cold joints appear during the pouring process when one layer of. Managing cold joints is an important concept to grasp when working on concrete projects.