5-25 Mm Thickness High Quality Modified Marine Plywood Density: 0.85 Gram Per Cubic Meter (G/m3)

The grade of marine types makes a difference. Marine-grade wood must have a B-grade or better, according to the APA a Engineered Wood Association, and must have a B-grade or better, which we'll explore in the "More Details" part of this guide. This type of wood is one of the most well-built, high-graded plywood available.
Weather and water can cause mold, mildew, and damage in marine-grade wood. Because it isn't treated with chemicals, rot and decay can be an issue unless you use a pressure-preservative, as the APA recommends.
This wood must have no knotholes in any of its plies and employ a top-performing water-resistant glue between plies to be classified as marine-grade. If the wood becomes damp due to weather or rainy conditions, the glue will not stop working.
Marine-grade timbers are commonly seen on gazebos, planter boxes, and seats, among other outdoor furniture and decorative items.