Concrete, like most other construction materials, will expand and contract with moisture and temperature changes. These changes are referred to as volume changes. Volume changes produce cracks in hardened concrete, unless you can properly control them. These cracks will lead to structural damage over time, that’s not only expensive to repair, but can permanently damage your home. Making provisions for these changes are the only way to control the extent of the damage, and this can be done with concrete control joints, installed at predetermined locations. Concrete control joints eliminate random surface cracks and their ability to form. This is done by gathering, distributing, and dissipating stress forces resulting from variations in climate and environment. Mar-flex’s Control Joint System is designed to ensure optimum protection, with a watertight outside control-joint, which is created when filled with Mar-flex Waterstop Elastomeric Sealant and protected by Mar-flex Fiberglass Fabric Reinforcement. Our control joint system provides an economical, easy to use system for eliminating these cracks, which are unavoidable, uncontrollable, unsightly, and will eventually leak water, if you don’t install control joints to combat the problem.