| Concave | The curved rise from the middle of a board towards the outside edges perpendicular to the length of a deck. Board Construction - a detailed description that includes the measured rise from the lowest point in the middle of the board to the highest point at the widest portion of the board. Concave may be constant, progressive or varied over the length of the board. A full description for construction will include the point(s) from the middle of the board where rise starts, the arc(s) of the rise, the length and portion over which the described curve(s) runs and the transition point(s) where concave meets other elements typically found at the kick(s) of the deck. |