Can You Put Metal Roofing On Treated Lumber: What You Need to Know

Metal roofing has become an increasingly popular choice for homeowners due to its durability, longevity, and energy efficiency. However, when considering a metal roof installation, many property owners wonder whether it is safe and suitable to put metal roofing on treated lumber. This article will delve into the essential aspects of this topic, addressing the concerns and providing valuable insights for property owners planning to invest in a metal roof.

Can You Put Metal Roofing On Treated Lumber
Metal tile on the roof. Roof repairing

Understanding Treated Lumber:

Treated lumber, also known as pressure-treated lumber, is wood that has undergone a preservation process to enhance its resistance to decay, insects, and weather elements. This process involves impregnating the wood with chemicals, typically copper-based preservatives, that protect it from rot and pest infestations. Treated lumber is commonly used in outdoor construction projects, such as decks, fences, and support structures, where exposure to moisture and the elements is a concern.

Safety Considerations:

One of the primary concerns property owners have when it comes to installing a metal roof on treated lumber is the potential for chemical reactions between the metal and the preservatives in the wood. While the preservatives used in treated lumber are generally safe, certain types of metal, such as copper and aluminum, can react with the chemicals over time. This reaction may cause corrosion of the metal roofing panels and compromise the roof’s integrity.

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Compatibility of Metal Roofing with Treated Lumber:

The compatibility of metal roofing with treated lumber depends on the type of metal used for the roofing panels. Galvanized steel and zinc-aluminum coated steel are typically considered safe to use with treated lumber, as they are less susceptible to chemical reactions. Additionally, some metal roofing manufacturers offer protective coatings that further reduce the risk of corrosion when installed on treated lumber. However, it is crucial to consult with roofing professionals or the metal roofing manufacturer to ensure the materials are compatible.

Ensuring Proper Ventilation and Drainage:

Regardless of the type of metal roofing used, proper ventilation and drainage are crucial when installing a metal roof on treated lumber. Adequate ventilation helps to prevent moisture buildup, reducing the risk of wood decay and extending the lifespan of both the metal roof and the underlying lumber. Similarly, efficient drainage systems ensure that rainwater is directed away from the roof and the structure, minimizing exposure to moisture.

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Sealing and Waterproofing:

To provide an extra layer of protection against potential chemical reactions and moisture infiltration, sealing and waterproofing the treated lumber can be beneficial. Applying a high-quality sealant or waterproofing membrane to the wood before installing the metal roofing can help create a barrier between the wood and the metal, reducing the risk of corrosion and enhancing the roof’s overall durability.

Consulting with Roofing Professionals:

When in doubt about whether to put metal roofing on treated lumber, it is best to seek advice from roofing professionals or contractors experienced in metal roof installations. These experts can assess the specific situation, recommend suitable materials, and ensure that the installation adheres to the best practices for long-lasting performance and safety.


While installing metal roofing on treated lumber is feasible, property owners must exercise caution and consider specific factors to ensure a successful and durable installation. Choosing the right type of metal roofing, providing proper ventilation and drainage, and considering sealing and waterproofing measures are essential steps in this process. By consulting with roofing professionals and following industry guidelines, property owners can confidently enjoy the benefits of a metal roof on their treated lumber structures, combining the durability and longevity of metal with the protective features of treated wood.

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