To ensure the proper installation of shower tiles, it is recommended to use a waterproofing barrier in addition to the greenboard. There are several options available:
Cement backer board: Cement backer board, such as Hardibacker or Durock, is a widely used alternative to greenboard for tiling in wet areas. It is highly water-resistant and provides a solid substrate for tiles. Cement backer board is installed directly over the existing greenboard, creating a waterproof layer.
Waterproofing membranes: Another option is to use waterproofing membranes, such as RedGard or Kerdi, which are specifically designed for tiling in wet areas. These membranes are applied directly to the greenboard, creating a waterproof barrier before tiling.
Fiberglass mesh: Yet another alternative is to use fiberglass mesh tape and a waterproofing polymer to reinforce the greenboard. The fiberglass mesh tape is applied over the seams and corners of the greenboard, and then a waterproofing polymer is applied over the tape to create a waterproof surface.
While greenboard is a suitable choice for bathroom walls, it is not recommended to place shower tiles directly on it without additional waterproofing measures. To ensure a durable and long-lasting tile installation, it is best to use a waterproofing barrier such as cement backer board, waterproofing membranes, or fiberglass mesh with a waterproofing polymer. By taking these precautions, you can have peace of mind knowing that your shower tiles will be properly protected from moisture and potential damage in the long run.