Can you tile over drywall? Technically, yes, but there are specific applications where it’s acceptable. The first scenario is a backsplash, where little to no water exposure makes tiling over regular drywall viable. Some thinsets in the market adhere well to plain or primed drywall, excluding painted surfaces—crucial to note before starting any tiling project.

Another suitable application is when designing an accent wall. Similar to a backsplash, an accent wall sees minimal water exposure, eliminating the need for a waterproofing membrane.

However, a critical point to emphasize is that setting tile directly over drywall is not acceptable in areas with constant water exposure, such as tub surrounds or showers. While some installers may follow this practice, it poses a significant risk. The gamble could result in water damage, rotting studs, subfloors, and floor joists. If the installation is on a second story, it may even lead to water damage in the ceiling drywall below.

Another situation where tiling over drywall may not be feasible is when heavy tile or stone is going to be set directly to drywall and above a specific height. A fireplace surround is a good example of this. If setting ledge-stone on a fireplace surround and it surpasses 6’ high, it would be a good idea to get with the stone/ tile manufacturer and check to see if they need a certain backer board and fastened combo to ensure the structural safety of the wall.

In conclusion, tiling over drywall is possible, but it’s crucial to assess the situation carefully. Ensure it aligns with extremely little to no water exposure areas like backsplashes or accent walls, and avoid the risk in areas prone to constant water exposure.