Several bio-composites are used in roofing. Sustainable bamboo can be pressed and mixed with resins to form light, strong and impact-resistant roofing panels. Roof sheathing can also be sustainable. Environ Biocomposites and other companies use wheat and other fast-growing fibers to make sustainable particleboard or plywood replacements. Environ said its Microstrand sustainable building materials are lighter and stronger than traditional wood products, and emit no volatile organic compounds. Contact a local roofing contractor for more information on bio-composite roofing.