Abstract: A lightweight, multilayered panel for use in a modular vault or safe structure has multiple layers of cross-grained wood boards secured together by a grid of hardened masonry nails. The nails are driven into the panel layers from both major face surfaces of the panel and are angled from the perpendicular of the major face surfaces of the panel to increase the probability of a penetrating instrument striking a nail during a penetration attempt. The panel is covered in a layer of sheet metal, and a layer of Kevlar or some other ballistic resistant material is placed on one or more major face surfaces. Rabbet edges on the panel allow an assembly with reinforced seams, and two single panels may be secured together to form a double reinforced vault panel.

Abstract: A lightweight, multilayered panel for use in a modular vault or safe structure has multiple layers of cross-grained wood boards secured together by a grid of hardened masonry nails. The nails are driven into the panel layers from both major face surfaces of the panel and are angled from the perpendicular of the major face surfaces of the panel to increase the probability of a penetrating instrument striking a nail during a penetration attempt. The panel is covered in a layer of sheet metal, and a layer of Kevlar or some other ballistic resistant material is placed on one or more major face surfaces. Rabbet edges on the panel allow an assembly with reinforced seams, and two single panels may be secured together to form a double reinforced vault panel.