What type of nails should be avoided when dealing with CBUs?

When working with cement board underlayment (CBU), it is essential to choose the right fasteners to ensure proper installation and performance. Drywall nails should be avoided because they are not designed for the weight and structural requirements of tiling applications.

CBUs are specifically formulated to add strength and moisture resistance to tiled surfaces, which means they require fasteners that can provide adequate holding power in these conditions. Drywall nails may not provide the necessary grip and may corrode over time, leading to potential failure of the tiled surface and compromising the integrity of the installation. Instead, fasteners such as metal screws or specific cement board fasteners are recommended, as they are designed to work well with the substrate's properties. This focus on durability and appropriate material compatibility is crucial for a successful tiling project.