Your curbing has a one-year warranty against defects in materials and workmanship. Repairs of the affected area(s) will be done at no charge if the materials we used or the manner of installation by our workmen caused the defect.
The nature of the beast is concrete and it is going to crack. We place control joints every 2 ½’ to 3’ depending on the layout. Basically, we are trying to control where the cracking will occur. If you find a crack in the control joint, this would not be a warranty issue.