Marine-Grade Plywood vs Pressure Treated Plywood

Marine-grade plywood and Pressure Treated Plywood have a slight difference. They are made from different wood materials and by different processes. Both plywoods are used for different applications. 

It is very important to have the right plywood for the right project or else your project may get spoiled. In this post, we will know what are the differences between marine grade plywood and pressure-treated plywood and also know which is better for your application.

Difference between marine plywood and pressure-treated plywood

Difference between marine plywood and pressure-treated plywood
Difference between marine plywood and pressure-treated plywood
#Marine PlywoodPressure Treated Plywood
SurfaceBoth sides have a smooth surface.Both side rough surfaces
Bending CapacityNot bent more than 18mm.It can be bent more than 18mm.
WeightIt is always heavier than Pressure Treated Plywood.It is lighter than marine plywood.
KnotsA / A grade does not have knots, whereas in B / B grade there are some knots.Knots are presents.
Void and GapsThere are no voids and gaps between their veneer sheets.Voids and gaps are present between the veneers sheet.
Number of layersMarine plywood has a minimum of  9 to 11 thin veneers sheets.The exterior plywood consists of 5 or 7 veneers sheets
Quality veneersThe Marine Plywood is made from Douglas fir or Western Larch.Pinewood is used
StandardMarine-grade plywood follows BS 1088 Standard.Not sure
PriceIts price is always higher than the Pressure Treated Plywood.The price of this plywood is always less than marine plywood.
Marine-Grade Plywood vs Pressure Treated Plywood

Marine-Grade Plywood

Marine Plywood is perfect to use in humid and wet conditions and resists delaminating and fungal attacks. Marine-grade plywood primarily is used for those applications, where moisture is present for a long time. Marine plywood is often used to make boats, boat parts, docks, bathroom doors, and kitchen platforms.

Marine-grade plywood is made from high-quality veneer sheets of Western Larch or Douglas-fir. Marine is made by gluing 9- 11 solid veneer sheets together.

Marine plywood is not produced by the chemical treatment process, So we can also use it for kitchen and indoor purposes. It is not harmful to plywood humans.

Both sides of plywood are smooth, The smooth surface prevents moisture and dust from entering and makes the plywood more durable.

  • The Glues

Resorcinol is used to make marine grade plywood marine grade because it is the best waterproof adhesive to waterproof marine grade plywood.

Pressure Treated Plywood

Pressure-treated wood is the wood of choice when projects need to be protected from moisture and decay.

Most people use Pressure Treated Plywood for outdoor projects. The term “pressure-treated” refers to a chemical process that makes the plywood more durable. The chemical is mechanically injected inside the plywood. So that plywood can be saved from termite and insect damage, fungal damage, bacteria weather damage. While pressure-treated plywood can still be damaged.

  • The Glues

Polyurethane Glue is used to make Pressure Treated Plywood. It works well in moisture. This glue characteristic makes this product a great choice when assembling projects made from pressure-treated plywood.

Why is Marine Grade Plywood Better?

Nothing better than marine plywood for marine and exterior applications. It is more durable. It is costlier than regular plywood and pressure-treated plywood due to its excellent properties.

Improving marine plywood depends on many things. Improving marine plywood depends on many things such as veneer sheets, glue, and the right way to make it. For marine application, Marine-grade plywood is a good choice

Marine plywood doesn’t have as many voids as regular plywood, which makes it structurally stronger.


So we see Marine-Grade Plywood vs Pressure Treated Plywood. Pressure Treated and Marine Plywood have their own properties. If your project budget allows for marine plywood cost and your project is a marine application. So it would be better to use marine-grade plywood.

Applications made from marine-grade plywood are very durable compared to other plywood in moisture conditions.

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