Can we install a new ceramic on a ceramic floor?

You hate your ceramic (or porcelain) floors and have thought of a simple strategy to remedy this: install new ceramic tiles over the old ones. This will hide the old tiles and save you from having to tear everything out. But is it a good idea?

The answer depends on various factors, particularly the condition of the surface to be covered.

Check the Stability of Your Floor

First, know that it is possible to lay new ceramic tiles over existing ceramic. It's a cost-effective option, as well as a quicker solution than removing the existing tiles and then laying new ones afterward.

Nevertheless, you must consider the most important factor for this installation: the stability of the subfloor. It must be level, flat, and stable. Otherwise, the result could disappoint you, both aesthetically and in terms of durability.

How to Check the Stability of the Flooring?

Tap with your fingers or with a small metal object – a coin, for example – on the existing ceramic tiles. Do you hear a hollow sound? This is probably an air pocket, a sign that the tiles were poorly installed due to a bad laying technique, adhesive unsuitable for this work, or a complete lack of adhesive.
Finally, inspect the tiles to detect any discoloration or mold stains. These small defects hide a big one: an absorption problem that will only worsen by laying new ceramic tiles on top.

In summary, if air pockets, discoloration, or mold are present, it would be better to remove the tiling and start over.

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Installing Tiles Over Existing Ceramic (or Porcelain)

Installing tiles over existing ceramic (or porcelain) involves almost the same steps as with a traditional subfloor. Here are the steps to follow:

Ensure that the existing tiles are level;
Repair broken or unstable tiles, if necessary;
Lay out the new tiles on the floor to choose the most effective and aesthetically pleasing installation pattern (direction). This step is essential if you're changing the dimensions or installation pattern;
Apply mortar to the existing ceramic;
Lay the tiles;
Apply the grout.

How to Effectively Remove Tiles Without Damaging the Subfloor?

If your project doesn't allow you to lay the new ceramic over the existing one, here are the steps to remove the existing tiles while protecting the subfloor that will be used for installing the new ceramic:

Wear the necessary protective equipment: gloves, safety glasses, mask, and knee pads if you're working on a large surface, as well as long clothes;
Start with the tiles at the edge of the room and work inward;
Use a wide-backed chisel and a hammer to lift the tiles. Hold the chisel in your non-dominant hand, with the tip at the bottom of the tile to be removed, and hit the handle with the hammer. Repeat for all tiles. It's normal for some to break and others to remain intact.
Scrape off all the mortar with your chisel. It's important to remove it entirely so that the surface is smooth and can accommodate your next ceramic installation.

Regardless of the condition of your existing ceramic, you are now better equipped to start your project. For advice on this matter or to choose ceramic that will harmonize with your decor, visit a Déco Surfaces store.