Sealing Treated Wood: What You Need to Know

Treated wood is commonly used in construction projects where the wood will be in contact with the ground or moisture. However, the effectiveness of the treatment can often be compromised by cuts or damage to the wood. In this article, we'll explore why sealing treated wood is important and recommend the best practices for doing so to ensure longevity and safety of your projects.

Understanding Treated Wood

Treated wood is subjected to preservative treatment to increase its resistance to decay, insect infestation, and moisture damage. The most common preservatives used are copper-based, such as copper arsenate (CA), or borate-based treatments.

Why Sealing is Necessary

While treated wood undergoes a thorough preservative treatment process, the factory treatment doesn't always result in complete saturation of the wood. This means that when you cut or shape the treated wood, the new cut surfaces expose areas that remain untreated. These untreated areas are more susceptible to rot, insect damage, and other forms of degradation. Sealing these cut ends is crucial to prevent moisture and insects from compromising the integrity of the wood.

Best Practices for Sealing Treated Wood

To ensure that your treated wood remains protected and continues to perform well over time, follow these best practices for sealing:

1. Clean the Cut Ends

Start by cleaning the cut ends thoroughly. Use a wire brush or sandpaper to remove any dirt, sawdust, or debris. Cleaning ensures that the preservative can make direct contact with the wood surface.

2. Apply Wood Preservative

Use a wood preservative that is compatible with your type of treated wood. Some popular choices include oil-based preservatives, such as linseed oil or paraffin wax, and water-based preservatives.

3. Soak the Cut Ends

Soaking the cut ends in wood preservative is an effective method for sealing. Place the cut ends in a bucket or container filled with the preservative. Ensure that the cut ends are completely submerged and allow them to soak for at least 24 hours. This process ensures that the preservative penetrates deep into the wood.

Alternative Sealing Methods

In addition to soaking, you can also seal the cut ends using other methods:

1. Brush-On Application

Apply the wood preservative using a brush or paint roller. This method allows you to control the application and ensure even coverage.

2. Spray Application

For large surfaces or awkwardly shaped wood, a spray application might be more practical. Use a sprayer designed for woodworking to apply the preservative uniformly.

Regardless of the method you choose, make sure to cover the entire surface of the cut ends, paying special attention to any cracks or crevices.

Conclusion

Sealing treated wood is a crucial step in ensuring the longevity and safety of your construction projects. By properly sealing the cut ends, you can prevent moisture and insects from damaging the wood, thus extending its useful life and ensuring the overall quality of your project. Whether you choose to soak, brush-on, or spray apply the preservative, the key is to ensure complete coverage and thorough penetration. With these tips and practices, you can confidently work with treated wood, knowing that you are doing everything possible to protect your investment.