While it is technically possible to install new tiles over existing ones, it is generally not recommended for several reasons:
Height Increase: Adding a new layer of tiles over the existing ones will increase the height of the floor. This can create uneven transitions between the kitchen and adjacent rooms, doorways, and appliances. It may also affect the functionality of baseboards, countertops, and other kitchen elements.
Weight: Double layering tiles will add extra weight to the floor, which might not be suitable for the underlying structure. It's essential to ensure that the subfloor can support the added weight to prevent potential issues in the future.
Durability: Installing new tiles over old ones may compromise the overall durability and longevity of the new installation. The old tiles might have hidden issues, such as cracks or loose tiles, which could affect the new tiles' stability.
Moisture and Adhesion: Trapped moisture between the old and new tiles can lead to adhesive failure, causing the new tiles to come loose over time.
Grout Lines: Layering tiles can create problems with the grout lines, making them more visible and potentially uneven.
Doors and Appliances: Adding height to the floor might interfere with the clearance of doors and appliances, leading to functionality and aesthetic issues.
If you are considering re-tiling your kitchen, it's generally best to remove the existing tiles before installing new ones. Removing the old tiles allows you to inspect the subfloor for any damages or issues that need to be addressed before installing the new tiles. It also ensures a clean, level surface for the new tile installation, promoting better adhesion and a professional finish.
While removing the existing tiles may require more effort and time, it is a worthwhile investment to ensure a long-lasting, high-quality result for your kitchen's new tile installation. If you're unsure about the process or concerned about potential challenges, consider hiring a professional contractor who specializes in tile installation to handle the project for you. They can help guide you through the process and ensure the job is done correctly.