Bonsal has developed ProPannel, a product the company claims is the lightest weight backerboard in the industry. A 1/2-inch, 3-by-5-foot sheet of ProPannel weighs eight pounds. The backerboard is 100% waterproof and can be cut with a utility knife without edge chipping. ProPannel is dust-free and produces no carcinogens. The company recommends the product for wall installations and light commercial floor installations.