Also known as waterproof plywood, this type of plywood is made using water-resistant hardwood layers and gorilla-strength glue. Marine plywood is often used for outdoor projects like fences, gazebos, boats, and patio furniture — objects that could experience damage due to moisture and condensation.
Marine-grade plywood is constructed from layers of wood, bonded or glued together, with the layers running at right angles to one another using waterproof glue. The higher-quality marine-grade plywood is made up of more and thinner layers of hardwood, making them stronger and more durable.