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Is pressure treated plywood the same as marine plywood?

Unlike traditional pressure-treated lumber, marine grade plywood is not chemically treated to increase its resistance to rot, mold, and moisture.

forestplywood.com - What is Marine Grade Plywood? -

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Marine-grade plywood is a hardwood panel capable of standing up to rain, snow, and moisture on a regular basis. Learn what marine plywood is and what projects it is best for. When it comes to outdoor furniture, decks, porches, boats, and other structures, marine grade plywood is known for its strength and durability, and is designed to stand up to the elements over time.

What is Marine Grade Plywood?

Marine-grade plywood (also called marine plywood) is a high-quality hardwood panel that is capable of standing up to rain, snow, and moisture on a regular basis.

Unique characteristics of marine plywood

Unlike traditional pressure-treated lumber, marine grade plywood is not chemically treated to increase its resistance to rot, mold, and moisture. Instead, it’s composed of many thin layers bound together with waterproof glue. These layers are cross-laminated for added strength, and the panel is bonded under heat and pressure.

Types of Marine Grade Plywood

Marine grade plywood comes in different sizes, thicknesses, and grades. The standard for marine plywood is British Standard 1088 and is used primarily for marine craft. Aquatek is a lower-cost alternative to the higher-spec BS1088. Joubert Okoume is the highest quality marine plywood available today and is certified by Lloyd’s of London to be manufactured to the British Standard 1088. Unlike other types of plywood, marine plywood is bound with a waterproof glue that won’t fail when exposed to water, high humidity, and boiling temperatures, protecting the plywood from delamination./li> The thin layers make marine grade plywood easy to cut and sand clean, and the higher grades are strong and lightweight, with limited defects. According to The Engineered Wood Association, plies may have knots but no knotholes (voids that could trap water, leading to rot). Unlike cedar or redwood, marine grade plywood is not naturally resistant to rot and decay, and may require a protective finish. However, with the right sealant, marine grade plywood can last for many years to come.

Still have questions on selecting marine plywood for your project?

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Can 1/2 inch plywood hold a TV?

If the secured stud span is less than about 24 inches (~ 60cm) then you should be ok with nominal 1/2" (12 or 13mm) thickness of plywood.

diy.stackexchange.com - Plywood Backed Drywall Equivalent to Studs for Hanging a TV?

If this were 1/2" plywood, I would have no concerns at all. With 1/4", it is a bit iffy. The plywood itself is relatively strong, particularly sandwiched between drywall and studs. The concern I have is whether the screws in the plywood have enough depth to grip well. What would definitely work, if there is enough space behind the drywall/plywood, is toggle bolts: This is a randomly selected assortment on Amazon, but you can get them from any hardware store. With drywall there is always a little concern you might hit a weak spot that was previously patched up. With plywood backing, toggle bolts can hold plenty of weight.

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