Is plywood suitable for outdoor use?

Plywood can be a suitable material for outdoor use depending on the specific circumstances and intended application. Plywood is a versatile type of engineered wood made by gluing together multiple layers of thin wood veneers. The adhesive used in the manufacturing process and the type of wood veneers used can significantly impact its performance, durability, and suitability for outdoor environments.

Exterior grade plywood, commonly known as "CDX plywood," is specially designed for outdoor use. It is manufactured with water-resistant adhesives and is typically made from durable wood species such as spruce, pine, or Douglas fir. CDX plywood is subjected to a pressure treatment that enhances its moisture resistance and helps it withstand the elements. This treated plywood is often used for outdoor structures like sheds, fences, and exterior sheathing.


However, it is important to note that even exterior grade plywood is not completely immune to moisture damage. It can still be susceptible to warping, swelling, and delamination if not properly sealed and maintained. To enhance its longevity and prevent moisture absorption, it is recommended to apply a high-quality exterior paint or sealant to all sides and edges of the plywood, including any cut or exposed areas.

Another consideration when using plywood outdoors is its exposure to sunlight. Prolonged exposure to direct sunlight can cause the wood fibers to break down, leading to fading, discoloration, and eventual deterioration. To protect plywood from UV damage, it is advisable to use a UV-protective coating or paint that can shield it from the harmful effects of sunlight.

It is possible to use plywood for outdoor applications if a variety of layers, corrections, and support materials are used. However, it is essential to remember that all wooden articles such as plywood tend to decay slowly within a short duration when subjected to tough weather conditions outside, irrespective of their previous state.