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Substrate preparation

Professional substrate preparation is an important step in the processing and finishing of concrete and screed surfaces. The purpose of this is to thoroughly remove residues such as oil, grease, dirt, adhesives and paint, to uncover imperfections and cracks and to improve the adhesion of the surface for further processing steps. Three different methods are available for this purpose: milling, grinding and shot blasting. Which of these is used depends on various factors such as the nature of the substrate and the desired surface structure. Read on to find out how the individual substrate preparation methods work, what advantages they offer and in which situations they are ideally used.

The most important facts about substrate preparation for concrete and screed at a glance

  1. Professional substrate preparation ensures optimum adhesion of new floor coverings and coatings.
  2. Depending on the condition of the substrate and the requirements of the project, it is carried out by milling, grinding or shot blasting.
  3. When carried out correctly, it prevents flaking and blistering and contributes to the aesthetics and durability of the final surface.
  4. For a perfect result, it is important that the substrate preparation is carried out by an experienced professional.

What is the purpose of substrate preparation and when is it used?

Substrate preparation of concrete and screed floors fulfills various purposes depending on the project. It is most frequently used before the application of synthetic resin coatings or floor coverings such as tiles or carpet. The purpose here is to remove impurities from the substrate and thus enable optimum and long-lasting adhesion of the covering. Another area of application is the renovation of private, commercial and industrial floors. With the help of milling, grinding or shot blasting, it is possible to remove oil, dust and old paint as well as residues of coatings and adhesives, thus creating the ideal basis for further work steps.

If the screed or concrete floor shows signs of damage (for example due to the load of heavy machinery in industrial halls or the constant traffic in public parking garages) and requires repair, substrate preparation can also be useful. In this way, cracks, holes and worn areas can be exposed and prepared for subsequent repair work. Last but not least, a thorough preparation of the substrate is carried out if screed or concrete surfaces are to be refined by polishing or sealing.

What types of substrate preparation are there and which ones?

Three main methods are used to prepare screed and concrete floors: milling, shot blasting and grinding. Each of these has its own individual advantages and areas of application. We present the methods in more detail below.

MillingMilling is a fast and effective process that removes several millimetres to centimetres of material from the concrete or screed surface using a tool roller or a rotating diamond disc. Exactly how much can be individually adjusted as required. This method is therefore also suitable for very uneven, contaminated or damaged surfaces. Even joint inlets or concrete splashes on the surface can be quickly and completely removed by milling, creating a uniform, even surface. This forms the optimum adhesion base for the floor covering. Deep processing has another advantage: fine cuts and larger cuts can be made in the surface in order to lay pipes or cables.

Shot blastingHere, small steel balls are thrown at the surface of the concrete or screed floor at a certain pressure and high speed, detaching small particles from the surface on impact. In this way, the surface is cleaned and profiled as required to prepare the substrate for a new coating. Small weak spots such as cracks or cavities can also be eliminated and even problematic residues such as petrol or oil can be removed. This is important to improve the adhesion of floor coverings to the surface. This process is very efficient, achieves uniform results without damaging the substrate and is also very environmentally friendly.

SandingIn this fine finishing of the substrate, a rotating grinding disc (usually with a diamond coating) removes around 1-2 mm of the surface in several passes. This not only fulfills a practical function, such as correcting the height of the concrete floor or screed under a door, but also serves aesthetic purposes. As the processing depth is less than with milling, the material is protected and the appearance is finer. By using appropriate impregnating agents, sanding can also be used as a sealant and polish. The process is characterized by a high shear strength and very good adhesive tensile values and enables a large area output per hour.

Professional substrate preparation: arrange a non-binding consultation now!

Regardless of the method, it is important that substrate preparation is carried out by an experienced professional. This is because excessive or uneven removal of the screed or concrete surface or choosing the wrong method for the substrate can lead to various subsequent problems and cause unnecessary costs. With us, you can be sure that the work will be carried out professionally. We only use employees with many years of experience in the preparation of screed and concrete floors and guarantee you perfect results. Arrange a no-obligation consultation now and find out more about us!