Which type of nail is required for use with fire- and pressure-treated wood?

Using a copper nail with fire- and pressure-treated wood is the correct choice because copper has a high resistance to corrosion. Pressure-treated wood is often treated with various chemicals, including copper-based preservatives that can react with certain metals, such as steel or aluminum, leading to accelerated corrosion. Copper nails will not have the same corrosion issues and are thus better suited for use with treated wood. This makes them a reliable choice in terms of longevity and stability in installations involving treated materials.

Other types of nails, like aluminum or steel, may corrode more quickly due to chemical reactions, while brass nails, although corrosion-resistant to some degree, may still not provide the same level of durability and compatibility with treated wood as copper nails do. Therefore, choosing copper nails ensures both structural integrity and resistance to weathering or decay, making them the best option for this application.