The 6 biggest mistakes when laying ceramic tiles (and how to avoid them)
A ceramic terrace looks sleek and modern, but it will only stay that way if the tiles are laid properly. In practice, things often go wrong, from subsidence to loose joints. This is a shame, because with the right preparation and installation, these problems are easy to prevent. In this article, you can read about the six most common mistakes made when laying ceramic tiles and what you can do to prevent them. This will ensure that your terrace remains beautiful and low-maintenance for years to come.
Why laying ceramic tiles correctly is crucial
Ceramic outdoor tiles are strong, colourfast and easy to maintain, but they require precise installation. Unlike concrete tiles, they do not absorb moisture, which makes the substrate and bonding extra important. If they are not laid correctly, they can shift, sound hollow or even break. A good foundation not only prevents damage, but also extends the life of your patio and maintains the sleek look that makes ceramic so popular.
Mistake 1: Insufficiently stable substrate
One of the most common causes of subsidence or uneven tiles is a substrate that is too soft. Ceramic tiles are thinner than concrete tiles and therefore have less play. If the substrate is not level or properly compacted, the layer may shift over time, causing the tiles to come loose or break.
Solution: ensure a stable, well-compacted foundation that is suitable for the chosen system. For solid (2 cm) ceramic tiles, a drainage mortar or MBI OXXOBASE system is suitable. If you are using GeoCeramica®, it can be laid on a prepared sand bed. Always check with a spirit level that the terrace is level throughout, including towards the drainage.
Mistake 2: Wrong adhesive or application method
Ceramic tiles do not adhere well to all tile adhesives or substrates. The adhesive must be suitable for outdoor use and for ceramics, which absorb very little moisture. If the wrong adhesive is used, tiles may come loose or sound hollow as soon as water gets underneath them. The application method also plays an important role: an adhesive layer that does not make full contact with the tile causes air pockets in which moisture accumulates.
Solution: use a suitable, flexible adhesive such as MBI Steenmeesterlijm in accordance with the application instructions. Apply the adhesive evenly to the substrate and tile to ensure complete adhesion. This will keep the tiles firmly in place, even when there are temperature differences.
Mistake 3: No grout or incorrect grout width
A common mistake is to lay ceramic tiles tightly together. At first glance, this looks neat, but it causes damage in the long run. Ceramic expands slightly when the temperature changes. Without a joint, the tension has nowhere to go, which can cause tiles to crack or come loose. A joint that is too narrow can also cause problems, as dirt and moisture accumulate and the joint cannot be filled properly.
Solution: always maintain a joint of at least three millimetres. Use a joint mortar that is water-repellent and flexible, such as AquaColor Joints, so that the terrace can expand and contract without cracking. A well-jointed terrace also looks neater and is easier to maintain.
Mistake 4: Poor drainage or slope angle
Ceramic tiles do not allow water to pass through, which means proper drainage is essential. If the terrace does not slope sufficiently, rainwater will remain on the tiles. This causes slipperiness, limescale marks and, in winter, even damage from frost.
Solution: ensure a slope of approximately 1 centimetre per linear metre, away from the house. While laying the tiles, regularly check with a spirit level that this slope is maintained consistently. This will allow water to drain away and keep the patio clean and safe.
Mistake 5: Incorrect processing temperature
Laying ceramic tiles at too high or too low temperatures can affect adhesion. At high temperatures, the adhesive dries too quickly, while moisture or frost in winter reduces the adhesive's adhesion.
Solution: lay ceramic outdoor tiles in moderate conditions, preferably according to the guidelines on the packaging. Avoid direct sunlight during gluing so that the adhesive can dry evenly and the tiles remain stable.
Mistake 6: Not paying attention to edges and edging strips
The edges of the patio are often overlooked, even though they are essential for stability. Without proper edging strips, tiles can shift or tilt at the sides, especially when subjected to weight or frost. Weeds can also grow in through the edges.
Solution: use edging strips or edging that are placed deep enough in the ground and fit tightly against the tiles. This prevents shifting and keeps the whole structure in good shape, even after years of intensive use.
How to avoid laying mistakes: the correct method step by step
Choosing ceramic outdoor tiles means choosing a durable and stylish solution. With a stable substrate, the right adhesive, correct joint width and adequate drainage, you can avoid most problems. Work accurately, check regularly with a spirit level and respect the expansion joints. Are you unsure about the right approach? Then ask an experienced landscaper or dealer who is familiar with MBI products for advice. This will ensure you can enjoy a sleek and low-maintenance terrace for many years to come.
Frequently asked questions about laying ceramic tiles
Can I lay ceramic tiles myself?
Yes, you can, but it requires precision and knowledge of the right materials. Ceramic is less forgiving than concrete. If you decide to do it yourself, it is advisable to follow the MBI laying instructions or seek advice from an authorised dealer or landscaper.
What adhesive should I use for ceramic tiles outdoors?
Use a flexible outdoor adhesive that is suitable for ceramic tiles and follow the manufacturer's instructions and the MBI processing advice. This will ensure optimal adhesion.
How wide should the joint be for ceramic tiles?
A joint of at least three millimetres is ideal. This allows the terrace to expand and contract with heat and cold without the tiles cracking or coming loose.
What to do if ceramic tiles have subsided?
Carefully remove the tile, check the substrate and fill in where necessary with a stable foundation such as drainage mortar or OXXOBASE. Then reapply adhesive and replace the tile. Finally, check the angle of inclination and re-grout after drying.
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