Marine plywood is a purpose-built structural plywood with a permanent Type A bond. So, marine grade will have good adhesion throughout the lamination. It has no voids, which makes it a very dense and water-resistant material. It is intended for use in hulls of boats and other marine applications. gtag('config', 'AW-799896374'); The product you're looking at doesn't specify this so it would probably be a lower count (thicker individual plies.). 'dimension1': 'What is the difference between marine plywood and regular plywood? Plywood graded C-D or CDX is often mistaken for exterior plywood but is not approved by the APA for outdoor exposure. 'dimension4': 'What is the difference between marine plywood and regular plywood? Applications include exterior sheathing, soffits, cabinets, shelving, and paneling. Reading a hardwood dealer's price list for plywood. Using a better grade will result in a higher value (including resale value), increased longevity of the boat, and a … The two species used for marine grade are Douglas-fir and western larch, although I've seen keruing and other species used in a plywood product called marine grade. The marine plywood is only available in A-A grade.