Form liner and method for forming concrete panels with artistic relief patterns

The method of preparing a concrete wall having a surface relief pattern thereon which comprises:

• a. preparing a containment form for concrete on a flat horizontal surface from perimeter members located at the top, bottom and opposite end edges of said wall;
• b. preparing a form liner from a planar sheet of expanded polystyrene foam and having a thickness less than 1/2 inch with opposite smooth surfaced planar surfaces by molding into one of said smooth surfaced planar surfaces a negative impression of said three dimensional pattern by the application to said one surface of a positive impression of said three dimensional pattern at a temperature from about 175.degree. to 225.degree. F. and pressure from about 2000 to 3500 psi and time sufficient to permanently deform said one surface into said negative impression;
• c. placing and securing said form liner on said flat horizontal surface within said perimeter form;
• d. pouring concrete into said form and over said form liner;
• e. permitting said concrete to cure;
• and
• f. raising said concrete wall into a vertical position, and stripping said form liner from said wall to expose said surface relief pattern thereon.