The Birch Plywood that we provide is wood that is an engineered product that is manufactured by gluing together thin layers of wood veneer. There are different types of plywood for specific jobs. For exterior plywood we use a waterproof glue for outdoor construction. Hardwood plywood, made from layered hardwood veneer, is used for its durability and attractive look in furniture. Plywood receives grades (ranging from A to D) based on the number of blemishes on the product.