Concrete expands and contracts with moisture and temperature changes, like most other construction materials. These changes are referred to as “volume changes”, because they produce cracks in hardened concrete due to changes in volume. Every structure should have provisions in place to combat the formation of these cracks. One easy way to control these cracks is to install concrete control joints at predetermined locations. When adequately designed and constructed, control joints eliminate these random surface cracks from forming by gathering, distributing, and dissipating stress forces resulting from changes in temperature and moisture levels. The Mar-flex Concrete Control Joint System is designed to ensure optimum protection for any structure, and this is done through a watertight outside control joint which is created when filled with Mar-flex Elastomeric Sealant and protected by Mar-flex Fiberglass Fabric Reinforcement. Basements require foundation walls that are watertight and waterproofed, and the Mar-flex Control Joint System provides an economical, and easy to use system for eliminating these cracks, which are unavoidable, uncontrollable, unsightly, and will even leak water if not properly planned for ahead of time with our control joints. Browse our selection today!