Applying tile over existing tile is possible, but requires proper preparation to ensure a strong bond and prevent future issues like loose or hollow-sounding tiles.
Steps for Tiling Over Existing Tile:
Here's a breakdown of how to successfully tile over existing tile:
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Prepare the Existing Tile Surface:
- Clean Thoroughly: Remove all dirt, grime, grease, and wax from the existing tile surface. Use a strong cleaner and scrub vigorously.
- Check for Loose Tiles: Identify and repair or replace any loose or hollow-sounding tiles. Loose tiles will compromise the integrity of the new tile installation.
- Ensure a Level Surface: The existing tile surface needs to be relatively level. Address any significant unevenness or lippage.
- Key the Surface (if needed): In some cases, especially with very smooth existing tiles, creating a "key" for better adhesion is necessary. This can be done by lightly scoring the surface with a diamond grinder or using a special bonding agent.
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Apply a Primer/Bonding Agent:
- Apply a primer slurry, or bonding agent, specifically designed for tiling over existing tile. This creates a strong bond between the old and new tiles. A suggested mix is TAL Bond and Tal Key Coat.
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Apply Thin-Set Mortar:
- Choose a high-quality thin-set mortar appropriate for the type of tile you are installing and the existing substrate.
- Apply the mortar evenly using a notched trowel, holding the trowel at a 45-degree angle. Ensure you use the correct notch size recommended for your tile.
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Install the New Tiles:
- Press the new tiles firmly into the mortar, using a slight twisting motion to ensure good contact.
- Use tile spacers to maintain consistent grout lines.
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Allow to Cure:
- Allow the thin-set mortar to cure for the recommended time (usually 24-72 hours) before grouting.
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Grout the Tiles:
- Apply grout to fill the joints between the tiles.
- Remove excess grout with a grout float and sponge.
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Clean and Seal:
- Clean the tiles thoroughly to remove any remaining grout haze.
- Seal the grout to protect it from stains and moisture.
Important Considerations:
- Weight: Consider the added weight of the new tile layer. Ensure the underlying structure can support the additional load.
- Floor Height: Tiling over existing tile will raise the floor height. Make sure this doesn't create issues with door clearances or transitions to other flooring surfaces.
- Tile Type: The type of existing and new tile can impact the success of tiling over tile. Consult with a tiling professional or the thin-set mortar manufacturer for specific recommendations.
By following these steps and considering the important factors, you can successfully apply tile over existing tile, creating a beautiful and durable new surface.
