Can You Use Pressure Treated Plywood on a Boat?

Yes, pressure treated plywood can be used on a boat, but there are important considerations to keep in mind.

Benefits of Using Pressure Treated Plywood

Pressure treated plywood is treated with chemicals to resist rot, decay, and insect damage, which makes it appealing for marine environments. It can be especially useful for parts of the boat that may be exposed to moisture but not fully submerged in water for extended periods, like decks or flooring.

Where It Can Be Used on a Boat

• Decks: Pressure treated plywood is often used for boat decks because it withstands moisture and can handle heavy foot traffic.
• Framing: It can also be used for structural components where durability is crucial.

Limitations of Pressure Treated Plywood for Boats

• Not Ideal for Constant Submersion: While it resists moisture, pressure treated plywood is not designed for long-term submersion. When used below the waterline or in areas that stay wet continuously, it may absorb water over time, leading to swelling, warping, or eventual breakdown.
• Chemical Leaching: The chemicals used in pressure treating can leach into the water, which may be a concern for marine ecosystems. This is especially important if your boat will be in natural bodies of water.
• Weight Consideration: Pressure treated plywood is heavier than marine-grade plywood, which can affect the overall weight and balance of the boat.

Alternative Options

For long-lasting results, marine-grade plywood is a better option for areas below the waterline or for boats that are regularly in contact with water. Marine plywood is constructed with waterproof adhesive and has fewer voids, making it less prone to absorbing water.

Final Recommendation

If you’re building or repairing a boat, pressure treated plywood is suitable for above-the-waterline applications like decks and framing. For below-the-waterline or continuous water exposure, consider using marine-grade plywood for better performance and longevity.

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