The Do‘s and Don’s of Installing Tile Trim on External Corners

  • By:jumidata
  • 2024-05-15
  • 4

The Do’s and Don’ts of Installing Tile Trim on External Corners

Installing tile trim on external corners can enhance the aesthetics and functionality of your tiling project. However, it requires precision and attention to detail to achieve a seamless and professional finish. Here are the essential dos and don’ts to guide you through the process:


1. Choose the Right Trim

Select tile trim specifically designed for external corners. These trims typically have a 90-degree angle and are available in various materials such as metal, plastic, or ceramic. Consider the style and color that complements your tile and grout.

2. Measure and Mark Accurately

Measure the length of the external corner and mark the corresponding measurements on the trim. Use a level to ensure that the trim will be installed straight.

3. Cut the Trim

Use a miter saw to cut the trim at a 45-degree angle on both ends. This will create a mitered joint that fits snugly against the tiles on the adjacent walls.

4. Apply Thinset Mortor

Apply a thin layer of thinset mortar to the back of the trim. Spread evenly and remove any excess using a notched trowel.

5. Position the Trim

Carefully position the trim in its designated location, ensuring that the mitered joints align perfectly. Press it into the thinset mortar to create a solid bond.


1. Overlap the Trim

Avoid overlapping the trim at the external corner. This will create an unsightly and uneven appearance.

2. Use Adhesive Instead of Thinset

Thinset mortar provides a stronger and more durable bond than adhesives. Using adhesives may compromise the durability of your tile installation.

3. Neglect Grouting

Grouting the trim is crucial to fill gaps, prevent moisture penetration, and create a smooth transition between the trim and the tiles.

4. Install Trim Before Tiling

Always install tile trim after applying the tiles. This ensures that the trim covers the edges of the tiles and creates a clean and finished look.

5. Overtighten Screws

If the trim requires screws for additional support, avoid overtightening them. Excessive pressure can crack or damage the trim or the tiles.

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