Clay Units
Acme Brick Company, American Brick Company, Baggeridge Brick, Brampton Brick, BRIKproducts (Aust.) Pty.Ltd., Canada Brick, Cap Bricks, Carolina Ceramics, Castaic Brick and Clay, Eco Brick Systems
Concrete Units
Air Vol Block, Inc., Anchor Block Company, Arriscraft International, Coronado, Hi-Way Concrete Products, Kelley Blocks, New Holland Concrete, PaverModule, Roofblock, Roofclad
Glass Units
Euro-glashaus, Glashaus, Inc., Glass Block U.S.A., International Product Supply, Pacific Accent, Pittsburgh Corning, Tafco Corporation