Tile coverings are only as good as the surfaces they adhere to. In other words, good preparation is everything. In the end, it is decisive to the long-term quality of floor tiles coverings. Most importantly, the primer plays an important role in improving the effectiveness of tile adhesive, ensuring the best retention and perfect effect. So do you know what's the most important thing when cover floor tiles?
Preparation of substrate: tile adhesive alone is not enough
Even if tiles use tile adhesives that match the material and substrate, this is not enough to ensure optimal adhesion. On the contrary, absorbent substrates such as plaster of Paris, mineral plaster or aerated concrete can even remove a large amount of moisture from the tile adhesive, thus seriously damaging the tile adhesion. Only primer can reliably counteract this process, because it can also be used as damp proof layer, etc.
Requirements for ceramic tile covering
In general, the following applies: the substrate must be stable, flat, and crack free before starting the primer. First, the floor must be thoroughly clean and free from dust, grease, dirt and loose material residues. Because only clean, dust-free and dry surfaces are stable.
Unevenness, especially in old buildings, can be treated with appropriate leveling compounds when measures are taken for existing buildings: integrated glass fiber reinforced materials are expected to improve the safety of cracking-prone substrates.
Another example is a flooring compound containing plastic additives, which reduces foot noise and separates tiles and tile adhesives from the substrate - a necessary measure, especially for young, shrinkage prone concrete surfaces, cracking prone irons, and mixed or wood substrates. Due to decoupling, the tension from the underground is not transmitted directly to the tile cover, which can damage the ceramic.
The choice of the correct primer always depends on the nature and absorbency of the floor - for example, superabsorbent substrates should be treated with solvent based tile primer in two working steps, where the first coat should be diluted, the second and the last coat undiluted.
The ceiling brush ensures uniform results. Once the screed is dry, the ceramic cover can be placed, usually after two to four days. But be careful with new concrete floors: as long as they are still damp, they should not be primed. If the concrete floor is completely dry, the tile can be laid directly with tile adhesive in this case.
Check the absorbance of the substrate
Scratch test: the deeper the sharp object penetrates the substrate, the lower the strength. Very sandy subsoil should be renewed.
Waterproofing test: if the surface absorbs water and changes color in the process, a primer is required.
Tape samples: this method shows if the existing paint has to be removed. To do this, press on the tape firmly and pull it down sharply after a few minutes. If the paint flakes, it must be removed
Screed: that's how primer works
With the aid of a self leveling compound, known as a flow screed, the screed can be used relatively quickly as a primer. The result is a flat, pressure resistant surface that can walk and lay after about ten hours of drying. By the way, both concrete and cement mortar are good reasons for subsequent tiling.
Another kind of primer is the so-called primer, also known as bonding bridge. This is a coarse-grained mortar with a pure cement-based or plastic modified binder, mainly used for non absorbent smooth substrates such as metals. Because the ordinary ceramic tile mortar usually does not have good bonding strength here, the primer plays the role of connecting layer between the substrate and the ceramic tile adhesive.
Special case: cement base material
The untreated cement floor has a layer of so-called cement skin, which must be removed before using tile adhesive. You can do this by brushing the wet board with a steel brush. On the other hand, cement floors that have been painted or impregnated, for example, must be completely removed. For this reason, mechanical process or special paint remover can be used. After that, it needs to be cleaned thoroughly to get a uniform and sticky primer.
Note: provide sealing in wet areas
If tile coverings are to be placed in wet areas, they must be waterproof to the ground as water and moisture can enter under the tiles through the joints. In China, composite seals are usually used.
Tile primer can achieve the perfect effect
Those who adhere to the motto "lay first, then tile" can expect the perfect result, because the adverse side effects that damage the quality and durability of tile coverage can be avoided.
Primer can improve the effectiveness of tile adhesive
Care should be taken to remove dust, dirt and material residues
Select suitable primer according to surface type