or non skid depending upon the intended use those of ordinary skill in the art are aware that the top surface preferably comprising aliphatic polyurea can be customized with various finishes during the production process to provide additional protection from chemical exposures customer logos can be installed on the finish prior to actual installation of tiles at a job site the outer edge of each tile is designed to contain a notch or groove preferably z shaped and alternatively semi circular so that when two tiles are placed adjacent to each other a cavity is formed a z shaped notch or groove promotes the flow of joint or seam filler and creates a locking gasket around the tiles the cavity formed by adjacent tiles is filed with flexible joint or seam filler to prevent intrusion of water or other liquids or contaminants the flexible filler allows the tiles to expand and contract during temperature changes without compromising the seal between tiles the underside of the tiles preferably have a roughened finish and include angular troughs or channels to allow adhesive to enter the troughs or channels to promote adhesion of the bottom surface of a tile to the substrate preferably the troughs or channels are alternately angled in different directions to promote increased physical adhesion of the underside to the adhesive joint or seam fillers can be selected from silicon polyurea and other suitable materials preferably the filler material is flexible and resistant to chemical attack the joint or seam filler when cured serves as a gasket that seals out and prevents moisture and other.