Supportive Device for Shelves, Seats and Steps in Wet Construction Areas

A method of manufacture of a structurally supportive device for constructing a weight-bearing horizontal feature in a wet area of a building, the method comprising:

• forming an essentially flat and triangular horizontal support surface bounded by a first edge, a second edge, and a third edge, wherein the first edge and the second edge form an essentially right angle;
• disposing a vertical presentation surface at an essentially right angle depending downward from the third edge;
• forming a horizontal support lip disposed along a bottom edge of the vertical presentation surface;
• providing a first attachment tab protruding a first distance from the first edge and extending at least two-thirds a length of the first edge;
• and
• providing a second attachment tab protruding a second distance from the second edge and extending at least two-thirds a length of the second edge;
• wherein the first tab protrusion distance and the second tab protrusion distance are configured to be received into a slot formed into a wall surface finishing material without penetrating beyond the wall surface finishing material thereby avoiding penetrating a waterproof membrane or a wall board, and wherein the horizontal support surface and vertical presentation surface are configured to receive a feature finishing material.