At first, tiling over drywall might not seem like a great idea since drywall looks too weak to hold tiles. Despite this, drywall is actually the most common surface used for wall tiles. You can tile over drywall if it’s in a dry area and the drywall is stable. Tiling in wet areas like showers is not a good idea. Water can damage the tiles and lead to mold or pests.
Generally, you can tile over drywall in most places. You can install tiles on drywall in kitchens or bathrooms with some water exposure.
Do I have the Option of Tiling Over Drywall?
You can tile over drywall in most rooms of your house without problems. Just make sure to prepare the drywall properly and use the correct mortar. This will ensure a successful tiling project. This method is safe, reliable, and commonly used by contractors.
I’ve personally done this many times in two houses that my wife and I have renovated, as well as in new construction projects.
You should avoid using tile on drywall in areas that are wet or constantly humid.
Here are some places in your home where you shouldn’t put tile on drywall:
- Around the tub or shower
- In a sauna
- Any outdoor area, such as an outdoor kitchen
Some areas prone to moisture can still be tiled, but you need to be cautious. For example, many homeowners tile over drywall around kitchen and bathroom sinks. If there’s a plumbing issue or a leak, problems can arise, which we’ll discuss in the next section. However, people generally consider it safe.
Why Should You Not Tile Over Drywall In Wet Areas?
Tiling over drywall in wet areas isn’t usually against building codes, but it can be risky. Here are three solid reasons why you shouldn’t tile over drywall in wet spaces:
Mold: Moisture can seep through the tiles and into the drywall and wood behind them. Mold thrives in these damp and dark conditions. You’ll notice the problem when the tiled wall starts feeling soft under pressure, indicating a severe issue.
Water damage: Moisture can damage both the drywall and the wood behind it. If mold is present, which is likely, it can create structural problems.
Pests: Many insects are drawn to moisture. Water that accumulates behind the tiles can attract pests like carpenter ants and termites. These pests can then cause damage to other parts of your home.
Tiling over drywall in bathrooms is not a good idea because the damage might not be visible until it’s too late. If you have mold or moisture problems, it’s crucial to detect and address them early.
How To Install Tiles In Humid Or Wet Rooms?
We know it’s risky to tile directly over drywall in damp areas. So, what are the best ways to tile in wet spaces like bathrooms?
Use Cement Board in Wet Areas Cement board is the best material for tiling in wet areas. It comes in sheets like drywall but doesn’t grow mold or degrade when exposed to water.
When installing cement board, follow these steps:
- Add a Water Barrier: Place a water barrier between the cement board and the wall to prevent moisture from getting through.
- Seal the Seams: Use waterproof tape to seal the seams between the boards.
Alternatively, you can use a water-resistant tile backer for these areas.
How to Prepare Drywall for Tiling?
Before installing tiles on drywall, it’s important to properly prepare the surface for the best results. Here’s how you can get your drywall ready for tiling:
Preparing Unpainted Drywall
- Seal the Joints: Make sure the drywall joints are sealed. If not, seal the seams and sand the entire wall for a smooth surface.
- Sand the Wall: Smooth out any rough areas to ensure an even base for the tiles.
- Clean the Surface: Vacuum and wipe the wall with a damp cloth to remove dust.
- Apply Primer: Paint the wall with a primer to seal the drywall, protect it from moisture, and create a smooth surface for the tiles.
- Drying Time: Allow the primer to dry completely before starting the tiling process.
Preparing Painted Drywall
- Clear the Area: Remove faceplates from light switches and outlets, and take off any trim.
- Clean the Walls: Wash the walls with TSP to remove dirt and buildup, ensuring the tiles will adhere properly. Let the walls dry completely.
- Fill and Sand: Fill any significant gaps and sand imperfections to create a smooth surface.
- Spackle and Clean: If you use spackle to patch the wall, sand it smooth and clean the area with a damp cloth. Let it dry.
- Optional Painting or Priming: If desired, paint or prime the walls before tiling. Sand the paint slightly to create a good bond between the wall and the tile. You can skip this step because the paint or primer won’t show once the tiles are installed.
New Drywall
Wait four weeks before tiling new drywall to ensure the plaster is fully dry and hard.
What Mortar Should You Use to Tile Over Drywall?
For tiling over drywall, especially for backsplashes, it’s best to use thin-set mortar.
- Thin-Set Mortar: This is recommended because it provides strong adhesion and is suitable for areas with some moisture.
- Avoid Mastic: Mastic can be used, but it’s not recommended for humid or moist areas. Using thin-set mortar instead reduces the risk of tile failure.
Can You Install Large Tiles Over Drywall?
Yes, you can install large tiles over drywall. However, be cautious with heavy tiles, as they might exceed the weight that drywall can support. Ensure the drywall is properly prepared and securely attached to handle the extra weight.
Is Tiling Over Drywall Safe?
Tiling over drywall in areas of your home with low moisture levels is safe. Just make sure to prepare the wall correctly and use the right mortar.
In bathrooms, use cement board or tile backer made for wet areas to avoid moisture problems and make sure it lasts.