Patent ID: 7838095

Claim:
A polymeric void-board for placement between adjacent horizontal layers of bricks to maintain an opening in a lower of the layers, the void-board comprising: a first relatively thin rigid planar element having first and second surfaces having a plurality of parallel ribs extending from and generally transverse to the first surface; and a second relatively thin rigid planar element having first and second surfaces having a plurality of parallel ribs extending from and generally transverse to the first surface, wherein the first element and the second element each have a density of between approximately 0.7 gm/cc and 1.3 gm/cc, and wherein the first and second elements are joined to one another with the ribs of the first element engaging and joined to the second element, the ribs of the first element are parallel and joined to the ribs of the second element, spaces being defined between adjacent ribs of the first element and the second element, the spaces being void spaces and including weakened regions formed in the first and second elements generally parallel to the ribs and aligned with one another between selected ones of the ribs so as to provide a plurality of frangible regions for separating the board.