Top 10 Factors To Consider When Choosing Waterproof Plywood

choosing waterproof plywood

When it comes to choosing the right plywood for a project, waterproof plywood is an excellent option that offers durability and resistance against moisture damage. 


However, not all waterproof plywood is created equal, and there are different factors that you need to consider before making your final decision. 


In this blog post, we’ll explore the top 10 factors to keep in mind when choosing waterproof plywood so that you can make an informed choice for your next construction or DIY project. From thickness to quality of wood grain, we’ve got you covered with everything you need to know!


What is Waterproof Plywood?


Waterproof plywood is a specific type of plywood that has been treated with a water-resistant sealant. This special coating makes it highly suitable for environments that experience significant moisture, such as bathrooms and kitchens. 


It is also commonly utilized in outdoor settings, including decks and sheds, where exposure to water and weather elements is prevalent. 


The waterproofing property of this plywood ensures its durability and prevents damage caused by moisture, making it an excellent choice for areas where protection against water is crucial.


Factors to Consider When Choosing Waterproof Plywood

1. Water Resistance


When selecting waterproof plywood, it is crucial to ensure that the material has a high level of water resistance. This means that the plywood is designed to withstand exposure to water without absorbing it or losing its structural integrity. 


Water-resistant plywood is typically treated with special coatings, sealants, or preservatives that prevent water from penetrating the wood fibers.


2. Bonding Strength


The bonding strength refers to the quality of the adhesive used to bond the layers of plywood together. A strong bond is essential for the plywood’s durability, especially in wet environments. 


Plywood with a weak bond may start to delaminate or separate when exposed to moisture, leading to structural weakness and potential water damage. Look for plywood that has a strong and reliable bonding strength.


3. Plywood Grade


There are 4 plywood grades available – A, B, C and D. Each grade indicates the quality and intended use of the plywood. For waterproof applications, it is recommended to choose plywood with a higher grade, such as A or B. 


These grades typically have fewer knots, voids, and defects, making them more resistant to water damage. Lower-grade plywood may have gaps or weak spots that can compromise its waterproofing capabilities.


4. Exterior Glue


Exterior-grade plywood is manufactured with adhesive or glue that is specifically formulated to withstand moisture and weather conditions. This type of glue has enhanced water resistance properties compared to interior-grade glue. 


When exposed to water, exterior-grade glue resists delamination and maintains the integrity of the plywood. It is crucial to confirm that the waterproof plywood you choose uses exterior-grade glue to ensure its suitability for wet environments.


5. Core Material


The core material of the plywood can significantly impact its water resistance. Marine-grade plywood, for example, has a core made from hardwood veneers that are naturally resistant to water. This type of plywood is designed specifically for water-related applications, such as boat building or exterior construction. 


Exterior-grade plywood is another option that features a core made from moisture-resistant softwood species. Considering the core material is important to ensure the plywood’s ability to withstand water exposure.


6. Veneer Quality


Veneer quality refers to the thin layers of wood that form the surface of the plywood. High-quality veneers are less likely to warp, crack, or delaminate when exposed to moisture. 


Look for plywood with smooth, defect-free veneers that have been properly treated or finished to enhance their water resistance. High-quality veneers contribute to the overall durability and longevity of the waterproof plywood.


7. Certification


When selecting waterproof plywood, it is beneficial to consider certifications and industry standards. Certifications from reputable organizations like the Forest Stewardship Council (FSC) or the International Marine Certification Institute (IMCI) provide assurance that the plywood has undergone rigorous testing for water resistance and quality. 


These certifications indicate that the plywood meets specific standards and can withstand moisture-related challenges.


8. Application


Consider the specific application of the plywood and the level of water exposure it will face. Different projects require different levels of water resistance. For example, plywood used for outdoor furniture or boat construction will need higher water resistance compared to plywood used for indoor cabinetry. 


Evaluating the specific demands of your project ensures that you select plywood with the appropriate level of water resistance to ensure its long-term performance.


9. Thickness


The thickness of the plywood can also affect its water resistance. Thicker plywood generally provides better resistance to moisture. Thicker panels have a larger number of layers, which creates more barriers for water to penetrate. 


They are often more suitable for projects where water exposure is a concern. Consider the thickness requirements based on your project’s needs and the level of water exposure expected.


10. Manufacturer’s Reputation


Research and consider the reputation of the plywood manufacturer. Established and reputable manufacturers often have a track record of producing high-quality, water-resistant plywood. 


They invest in research and development to create products that meet industry standards and deliver reliable performance. 


Choosing plywood from a trusted manufacturer increases the likelihood of obtaining a product that will perform well in terms of water resistance and overall quality.


It is important to evaluate these factors collectively and consider your specific project requirements to make an informed decision when choosing waterproof plywood.




When it comes to choosing waterproof plywood, there are a few key factors to consider. From the type of glue used in construction, to the thickness and grade of wood used, these all play an important role in determining how effective your plywood will be at resisting moisture. 


By considering these factors collectively and aligning them with your specific project requirements, you can make an informed decision when choosing waterproof plywood. This will help you achieve long-lasting, reliable, and water-resistant results in your construction or woodworking projects.


Furthermore, there is a wide selection of plywood types available to cater to your specific needs and requirements. 

This includes fire retardant plywood, calibrated plywood, and more. Each variant of plywood offers unique features and characteristics that make them suitable for a diverse range of applications.



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