Can you use cement board instead of plywood on exterior wall?

Yes, cement board can be used instead of plywood on exterior walls, particularly in areas prone to moisture, as it is more resistant to water damage and rot. However, it's important to ensure proper installation and adherence to local building codes. Cement board is typically used as a substrate for siding or tile, while plywood may be used for structural support, so the choice depends on the specific application and requirements of the wall system. Always consult with a professional to determine the best material for your project.