When choosing the perfect tile, we often first look at the color, pattern, and finish. However, there is one technical specification that is crucial for the durability and success of your project: tile thickness. Whether you are renovating a bathroom or constructing a driveway, the thickness of the tile determines how it should be laid and what it can withstand.
Why is tile thickness important?
The thickness of a tile is not arbitrary. It directly affects the breaking strength and weight of the material. A tile that is too thin on the wrong subfloor will crack, while a tile that is too thick can cause unnecessary thresholds or weight problems.
Standard thicknesses at a glance
-
Wall tiles (often from 6 mm): These are often thinner because they do not have to bear heavy loads. A thinner wall tile is easier to cut and process.
-
Standard floor tiles (often from 8 mm): The most common thickness for indoor use. These tiles offer the ideal balance between strength and manageability.
-
Extra thin tiles (often 3 mm - 6 mm): Often large ceramic slabs. These are ideal for renovations where tiling is done over an existing floor.
-
Outdoor tiles (often 20 mm or thicker): For patios and driveways, a minimum thickness of 2 cm is standard to withstand frost and heavy loads.
Consequences for laying and the subfloor
The thickness of your tiles has a big impact on the installation process. Here are the most important considerations:
1. The adhesive layer and the subfloor
The thicker the tile, the heavier it is. This means that the subfloor must be perfectly stable. For thick, heavy tiles, thick-bed mortar or a specific adhesive with a larger trowel (e.g. 12 mm) is often needed to ensure good adhesion and prevent air bubbles.
2. Transitions and thresholds
When planning, take into account the build-up height. The total height of your floor consists of:
If you opt for extra thick floor tiles, doors may need to be shortened or uneven transitions to areas with, for example, laminate, may occur.
3. Cutting and drilling
Thick tiles, especially hard ceramic (porcelain), require professional tools. While a standard tile cutter is sufficient for 8 mm, you often need an electric water-cooled saw for tiles of 12 mm or 20 mm.
Other aspects: Durability and use
-
Breaking load: In commercial spaces or garages where cars drive, a greater tile thickness is essential. A thin tile will immediately yield under the pressure of a vehicle.
-
Aesthetics: Thinner tiles have shallower joints, which often results in a sleeker, more modern look.
-
Thermal conductivity: For underfloor heating, the thinner the tile, the faster the heat passes through it. However, thicker tiles retain heat longer (heat accumulation).
