Plywood is an engineered wood made from multiple layers of thin veneer that are glued together. Each adjacent layer is rotated by up to 90 degrees to reduce the risk of splitting when nailed in at the edges. This 'cross-graining' technique also improves strength, stability and prevents warping, making it an excellent general-purpose construction panel. At B&Q we only buy responsibly sourced wood. All of our plywood sheets are CE and FSC certified.