an extruded polymeric void - board is configured for placement between adjacent horizontal layers of bricks to maintain an opening in a lower layer of the bricks . the void - board is formed as a relatively thin planar element having first and second surfaces . a plurality of parallel ribs extend from and generally transverse to the first side . the ribs have a predetermined height to width ratio and have a height that is less than a thickness of the planar element . the ribs being formed parallel to one another . a method for forming a bundle of bricks with the void - board is also disclosed .