Abstract: An extruded metal plank for use in the construction of deck surfaces is disclosed along with certain supporting structure for the plank. The metal plank includes a horizontal element having an upper surface, a lower surface, and two parallel edges defining outer boundaries of the upper surface. Two side elements depend from the lower surface contiguous to the two parallel edges for defining the sides of the plank. At least one supporting element depends from the horizontal element lower surface, each supporting element including a horizontal projection at a lower end of the element for supporting the plank. A plurality of additional elements depend from the horizontal element lower surface for maximizing the area of the lower surface to enhance heat transfer from the plank to the surrounding environment.