Welcome to Concrete Leveling Solutions! If you have sunken or settled concrete,.... Don't Replace Your Concrete,... RAISE IT... !!! CLS uses high-density polyurethane expanding foam to raise settled concrete in residential, commercial, industrial and municipal applications. The state-of-the-art polymer injection is a cost-effective, advantageous alternative to mudjacking and has been tested under the toughest conditions by the nation's top structural contractors.