Abstract: The method of making a plastic bench top is a method for manufacturing bench tops having a U-shaped channel formed by flanges depending from opposite sides of an elongated planar member. The bench top is mounted on pedestals, legs or the like. In general, the method includes forming a fold line by machining or by heating along the lateral edges of the elongated planar member to define flanges, folding the flanges so that the flanges are orthogonal to the planar member, and welding or fusing the joint, if necessary. Alternatively, discrete flange members may be heated simultaneously with the elongated lateral edges of the planar member, the heating element is withdrawn from between the flange and the planar member, and the flange is butted against the longitudinal edge to form a butt weld.