Choosing the Right Nails for Use with Pressure Treated Lumber in Your Projects

Types of Nails for Pressure Treated Lumber

When working with pressure treated lumber, it's essential to choose the right type of fasteners—namely, nails—that can withstand the chemical treatment applied to the wood. Pressure treated lumber is often used for outdoor projects like decks, fences, and landscaping due to its resistance to rot and insects. However, the chemicals used in the pressure treatment process can be highly corrosive, making the choice of nails critical to the longevity of your finished project.

1. Galvanized Nails

Galvanized nails are the most commonly recommended type for use with pressure treated lumber. These nails are coated with a layer of zinc to protect them from rust and corrosion. They come in different grades, but for outdoor projects involving pressure treated wood, it is advisable to use hot-dipped galvanized nails. These have a thicker zinc coating and provide superior protection against corrosion compared to electro-galvanized nails.

Hot-dipped galvanized nails are often labeled with a grade of G185 or higher, indicating their durability and resistance to rust. This makes them ideal for decking, fencing, and other constructions exposed to moisture. However, while galvanized nails offer excellent corrosion resistance, it’s essential to check for compliance with local building codes, as some areas have specific requirements regarding fasteners.

2. Stainless Steel Nails

For the ultimate protection against corrosion, stainless steel nails are the finest option, albeit more expensive. Unlike galvanized nails, stainless steel does not corrode, making it suitable for use in coastal environments or areas with high salt exposure. Stainless steel is particularly recommended for long-term waterproofing and hazardous environments, where galvanized nails may fail over time.

When selecting stainless steel nails, look for grades like 304 or 316. Type 316 stainless steel has the highest level of corrosion resistance and is ideal for marine applications or structures near large bodies of saltwater. While the upfront cost may be high, the durability of stainless steel nails provides long-term savings by minimizing maintenance and replacement.

3. Corten and Other Specialty Nails

In some cases, specialty fasteners such as corten nails may be used for aesthetic purposes or specific environmental conditions. Corten nails develop a rust-like patina that both protects the metal underneath and can add a visual appeal to the structure. However, these should be used with caution and typically in non-water contact applications, as their performance can vary based on the specific environment.

4. Considerations for Nail Type and Size

Choosing the right size and type of nail is just as crucial as the material. For example, larger nails are often useful for holding outdoor structures together where additional strength is required. Typically, 10d or 12d nails are common for most pressure treated applications. It’s also important to pre-drill holes in certain situations to prevent splitting the wood, particularly at the edges.

Conclusion

Choosing the right nails for pressure treated lumber is vital for ensuring the integrity and durability of your outdoor projects. Galvanized and stainless steel nails are the best options due to their corrosion-resistant properties. Always consider environmental factors, project type, and local regulations when selecting your fasteners. By investing time and thought into the choice of nails, you can significantly prolong the lifespan of your structures and minimize the risk of failure due to corrosion.