Best Plywood for Outdoor Use: Your Complete Guide

When it comes to selecting the best plywood for outdoor use, you need a material that can withstand the elements while maintaining durability and aesthetics. Whether you’re building a deck, outdoor furniture, or any other outdoor project, choosing the right plywood can make a difference. In this guide, we’ll explore the top plywood options for outdoor applications, their benefits, and the factors you should consider before making a purchase.

What Makes Plywood Suitable for Outdoor Use?

Not all plywood is the same, particularly when used for outdoor applications. The best plywood for outdoor use is designed to resist moisture, insects, and the natural wear and tear that comes with exposure to the elements. Here are some key features you should look for:

• Water Resistance: Outdoor plywood should be able to handle rain and humidity without warping.
• Durability: It must be strong enough to last for years, even in harsh weather conditions.
• Treatment: Some plywood is treated with chemicals to resist termites, mold, and decay.
• Grain and Layers: A higher number of layers indicates better strength and durability, especially outdoors.

Types of Plywood for Outdoor Use

1. Marine Plywood

Marine plywood is often considered the gold standard for outdoor projects. It’s designed to withstand water exposure, making it perfect for boats, docks, and areas near water. Made with waterproof glue and high-quality wood layers, marine plywood resists warping, cracking, and rotting.

Advantages:

• Water-resistant and highly durable
• It can be used in extreme weather conditions
• Long-lasting

Best Uses:

• Boatbuilding
• Outdoor decks and docks
• Garden furniture

2. Pressure-Treated Plywood

Pressure-treated plywood is another great option for outdoor use. This type of plywood is treated with chemicals to prevent insect damage, mold, and decay. It can withstand harsh weather conditions and is commonly used in outdoor constructions like fences, sheds, and garden furniture.

Advantages:

• Resistant to termites and fungi
• Durable in wet and humid conditions
• Cost-effective for large projects

Best Uses:

• Fencing
• Shed construction
• Outdoor flooring

3. Exterior-Grade Plywood (CDX Plywood)

CDX plywood, also known as exterior-grade plywood, is designed to handle moisture but isn’t as water-resistant as marine plywood. It is generally used in areas where it won’t be in direct contact with water but can still withstand outdoor conditions. This type of plywood is commonly used in roofing and wall sheathing.

Advantages:

• Affordable
• Good for semi-exposed areas
• Lightweight and easy to work with

Best Uses:

• Boatbuilding
• Outdoor decks and docks
• Garden furniture

4. Hardwood Plywood

Hardwood plywood is made from layers of hardwood veneer, providing it with excellent strength and durability. While not always as water-resistant as marine or pressure-treated plywood, it can still be used in outdoor settings if properly sealed. It’s often chosen for outdoor furniture due to its attractive grain and finish.

Advantages:

• Aesthetic appeal
• Strong and durable
• Can be sealed for outdoor use

Best Uses:

• Outdoor furniture
• Decorative exterior panels
• Pergolas

5. Phenolic Plywood

Phenolic plywood is a high-grade, water-resistant material made with phenolic resin. This plywood type is suitable for outdoor use in harsh weather and extreme environments. It’s resistant to abrasion, moisture, and chemicals, making it one of the best plywood options for industrial and heavy-duty outdoor applications.

Advantages:

• Resistant to chemicals and abrasion
• Durable in extreme conditions
• Long-lasting with minimal maintenance

Best Uses:

• Industrial outdoor applications
• Heavy-duty outdoor furniture
• Outdoor signage

Factors to Consider When Choosing the Best Plywood for Outdoor Use

1. Climate

The type of climate in your area will heavily influence your choice of plywood. For areas with high humidity or frequent rainfall, marine or pressure-treated plywood will be your best bet. In drier climates, exterior-grade or hardwood plywood might be more suitable.

2. Purpose

Consider the purpose of the plywood. Are you building outdoor furniture, a shed, or a deck? Different outdoor projects will require different levels of durability and moisture resistance.

3. Cost

While marine plywood is one of the best options, it can also be expensive. If you’re working on a budget, exterior-grade or pressure-treated plywood can be more affordable alternatives that still offer good durability for outdoor use.

4. Thickness

The thickness of plywood is another factor to consider. For heavy-duty outdoor structures, opt for thicker plywood to ensure strength and stability.

5. Finish and Sealing

To make your plywood last longer outdoors, it’s essential to apply a good quality sealant. Even the best plywood for outdoor use will benefit from an additional layer of protection against moisture and UV rays.

Maintenance Tips for Outdoor Plywood

No matter which type of plywood you choose, proper maintenance is key to ensuring it lasts as long as possible. Here are some tips to keep your outdoor plywood in top condition:

• Seal the edges: Moisture tends to enter plywood through the edges, so sealing them can prevent warping and decay.
• Reapply sealant: Every few years, reapply a water-resistant sealant to ensure your plywood remains protected.
• Clean regularly: Dirt and debris can lead to mold and mildew buildup, so regular cleaning can help extend the lifespan of your plywood.
• Inspect for damage: Check for cracks, warping, or signs of insect damage, and address these issues immediately.

Best Plywood for Outdoor Use: Top Brands

Several brands are known for offering high-quality plywood specifically designed for outdoor use. Some of the top brands include:

1. MRS Woodcraft: Provides high-grade plywood options that are not only durable but also resistant to weather elements, making them perfect for outdoor use. Their products are known for combining strength and aesthetic appeal, especially in outdoor furniture and structures.
2. Greenply: Known for durable and water-resistant plywood, especially suitable for outdoor furniture and structures.
3. SharonPly: This brand specializes in pressure-treated and marine plywood, ideal for areas with heavy rainfall and humidity.

How to Install Plywood for Outdoor Projects

Installing plywood for outdoor use requires proper preparation and tools. Follow these steps to ensure your plywood installation is successful:

1. Measure and Cut: Always measure the area before cutting the plywood to fit the exact dimensions of your project.
2. Seal the Edges: Use waterproof glue or sealant to cover the edges of the plywood to prevent moisture from seeping in.
3. Install with Screws: Use corrosion-resistant screws to attach the plywood securely. Avoid using nails, as they can loosen over time.
4. Finish with Paint or Sealant: Once installed, apply a weather-resistant paint or sealant to protect the plywood from the elements.

Conclusion

Choosing the best plywood for outdoor use doesn’t have to be complicated if you know what to look for. From marine plywood for extreme moisture resistance to pressure-treated plywood for termite and mold protection, the right choice depends on your specific project needs. Remember, no matter which type of plywood you choose, proper sealing and maintenance are crucial to ensuring its longevity in outdoor conditions.