Aug 15, 2006· Unlike concrete masonry units, AAC blocks are solid, with no molded core holes. Standard blocks are 8 inches high, 24 inches long, and 4 to 12 inches thick. An 8x8x24inch block weighs only 35 pounds, so it's easier to handle than a conventional concrete block. AAC can easily be tooled also, and even cut, drilled, and shaped with woodworking tools.