No, it is not recommended to put drywall directly on a concrete backer board. Drywall is typically used as an interior wall covering, while concrete backer board, also known as cement board, is specifically designed for use as an underlayment for tile and other masonry surfaces.
Here's why you should not put drywall on a concrete backer board:
Moisture Resistance: Concrete backer board is moisture-resistant and is intended for use in areas prone to exposure to water, such as bathrooms, kitchens, and other wet areas. Drywall, on the other hand, is not designed to handle moisture and can be damaged when exposed to water.
Bonding Surface: Concrete backer board provides a stable and rough surface that is suitable for the application of tile adhesive or mortar. Drywall does not offer the same bonding surface and is not designed to hold heavy masonry materials like tiles.
Structural Support: Concrete backer board adds structural support and stability to the installation of tiles, especially on walls and floors. Drywall is not strong enough to serve as a suitable substrate for tiles.
If you are planning to install tiles or other masonry surfaces, you should use the concrete backer board as the underlayment and adhere the tiles directly to the backer board using the appropriate adhesive. On the other hand, if you want to create a finished wall surface, use drywall as the interior wall covering over wooden studs, metal framing, or other suitable wall support structures.
Always follow the manufacturer's guidelines and best practices when installing any building materials to ensure a safe and durable result. If you are unsure about the correct installation methods, consider consulting with a professional contractor or builder experienced in working with the specific materials you are using.