What materials SHOULD NOT be installed in direct contact with treated wood?

The selection of certain roofing products as materials that should not be installed in direct contact with treated wood is based on the chemical properties of pressure-treated wood. Treated wood often contains preservatives designed to prevent rot and insect damage. Some of these chemicals can be corrosive to specific roofing materials and fasteners, especially those made from metal, leading to premature deterioration.

For example, the reaction between copper-based preservatives in treated wood and certain roofing materials, particularly asphalt-based products, can result in issues such as staining, warping, or the breakdown of the roofing material. Using products that are specifically resistant to these chemicals helps ensure the longevity and performance of both the roofing and the wood structure.

In contrast, while plastic membranes, standard fasteners, and fiberglass panels may present other concerns when paired with treated wood, they are not as significantly impacted by the corrosive effects of the wood preservatives as certain roofing products. Therefore, it becomes crucial to choose roofing materials carefully in order to avoid these interactions, emphasizing the importance of using compatible components in roofing systems.