Yes, you can stick new tiles on existing wall tiles, provided the existing surface is suitable.
Tiling over existing tiles is a common and practical approach for updating a space without the extensive and disruptive work of removing old tiles. As one reference points out, "Tiling over existing tiles is a good way to go as pulling old tiles off is normally a costly complete wall rebuild and needs re water proofing." This method saves significant time, effort, and expense, especially in wet areas like bathrooms and kitchens where waterproofing is critical.
Why Tile Over Existing Tiles?
Opting to tile over your current wall tiles offers several advantages:
- Cost Savings: Removing old tiles, repairing the wall surface underneath, and potentially re-waterproofing can be expensive. Tiling over avoids many of these costs.
- Time Efficiency: The preparation involved is generally less time-consuming than a full removal and surface repair.
- Reduced Mess: Less demolition means less dust, debris, and disruption to your home.
- Maintained Waterproofing: If the original tiling and waterproofing are intact and sound, tiling over helps maintain this barrier.
How to Tile Over Existing Wall Tiles
Successful tiling over existing tiles relies on careful preparation and using the right materials.
Key Steps & Considerations
- Inspect the Existing Tiles:
- Check that all existing tiles are firmly attached. Tap each tile – a hollow sound might indicate it's loose.
- Remove any loose, cracked, or damaged tiles. Patch these areas to create a flush surface.
- Ensure the surface is level and smooth. High spots may need grinding.
- Clean the Surface Thoroughly:
- Remove all soap scum, grease, dirt, and mildew. A strong cleaning solution and stiff brush are necessary.
- Rinse thoroughly and allow the surface to dry completely.
- Prepare the Surface for Adhesion:
- Existing glossy tiles need to be de-glossed to provide a key for the new adhesive. This can be done by sanding or using a chemical deglosser.
- Apply a suitable primer designed for non-porous surfaces to enhance adhesion.
- Choose the Right Adhesive:
- The reference specifically recommends using "a regular high strength flexable tile adhesive". This type of adhesive is crucial because it can accommodate slight movements and provides strong bonding to the existing tile surface. Look for adhesives suitable for tiling onto non-porous surfaces.
- Plan for Increased Thickness:
- Adding a new layer of tiles will increase the wall thickness. Consider how this will affect edges, corners, window frames, door frames, and fixtures (like shower valves or electrical outlets). You may need extension rings for outlets or deeper screws for fixtures.
- Grout Lines:
- Decide whether to align the new grout lines with the old ones or offset them. Aligning might require more careful planning but can sometimes look cleaner. Offsetting might help disguise unevenness in the original tiling.
Essential Materials
| Material | Purpose |
|---|---|
| High Strength Flexible Tile Adhesive | Bonding new tiles to old tiles |
| Tile Primer (for non-porous) | Enhancing adhesion to the glossy surface |
| Cleaning Supplies | Preparing the existing tile surface |
| Sandpaper or Deglosser | De-glossing shiny tiles |
| Trowel and Grout Float | Applying adhesive and grout |
| Tile Cutter | Cutting new tiles |
| Level | Ensuring tiles are straight |
| Grout | Filling gaps between new tiles |
Potential Drawbacks
While convenient, tiling over existing tiles does have minor drawbacks:
- Reduced Room Size: The extra layer of tiles slightly reduces the overall dimensions of the room.
- Increased Weight: Adding another layer increases the load on the wall structure. Ensure the wall can support the extra weight.
- Difficulty with Fixtures: Adjusting fixtures and trim to the new wall depth can be challenging.
- Risk of Failure: If the existing tiles are not sound or the surface is not properly prepared, the new tile layer can fail.
Provided the existing tile surface is stable, clean, and properly prepared using a suitable high-strength flexible adhesive, tiling over is a viable and recommended method for renovation.
