What are the Differences Between Marine Grade and Exterior Plywood?
The difference between marine-grade plywood and Exterior plywood is that Marine Plywood reduces the amount of surface preparation you need to make if you are seeking a material that provides an attractive base to work with. Marine-grade plywood has fewer gouges and knots between the plies, which makes it less apt to trap and hold water, and vapor
Exterior plywood, is different in that it is allowed to have voids and gaps for an A, B or C rating by the American Plywood Association, when compared directly to marine-grade plywood.
Douglas fir and western larch are usually used to manufacture marine plywood. These wood species can withstand water and water droplets better than other plywood varietes. As a result, if you live in a climate with high humidity or that experiences lots of rain or snow, marine-grade plywood has inherent properties that make it a more sustainable choice for deck repairs.
EXT Plywood is Simply Exterior Plywood Grades.
Exterior Plywood (EXT) is intended for use in projects with no structural requirements, exterior applications where a high quality finish is required. A bonded exterior plywood must be used for applications involving long term full exposure. All A bonded, exterior plywood should be treated against fungal attack and should be surface finished to minimize surface checking.
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