Seal concrete wall - injection

Concrete has grown in popularity in recent years. In principle, concrete has been used as a tried and tested building material for decades. But concrete can also leak. Like other building materials, concrete can also be waterproofed. In the last few years in particular, a number of new options have appeared on the market to seal even difficult cracks in concrete with the aid of an appropriate injection.

Different methods of sealing a concrete wall by means of injection

With concrete walls, it is usually not a question of sealing them if they are still intact. Rather, a concrete wall is usually sealed when cracks have appeared. To select the appropriate method for sealing the concrete wall, a distinction must be made according to the technical features:

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  • pure sealing injections
  • frictional injections
  • Crack grouting of deep cracks in the concrete

Pure waterproofing injections for concrete walls

Two-component resins are used today for this waterproofing of concrete walls. These must have a certain elasticity and deformability, as concrete components often work. Polyurethane synthetic resins are used especially in connection with sealing against water. These are also known as water stoppers.

Polyurethane resins foam as soon as they are injected. As a result, larger cracks make them sensitive to water that is regularly standing against it. For this reason, these polyurethane injection resins are only used as a preliminary seal for larger cracks in a concrete wall. Resins are then injected, which do not damage a larger area of water.

Non-positive injections into a concrete wall

Some concrete walls have a direct influence on the statics of a building. The overall stability of the building is negatively affected by cracks in such a concrete wall. Therefore, non-positive resins must be used here. Corresponding epoxy resins are suitable for this.

Seal deep cracks with crack grouting

If there are deep cracks in the concrete wall, other methods must be used. It has been proven here that the resin is pressed into the deep crack with high pressure. Two-component resins are also used here. These are pressed in with special machines and a correspondingly high pressure. Cracks with a size of up to 0.1 mm can be sealed efficiently in this way.

Tips & Tricks The size of a crack in a concrete wall must be taken into account as well as the direct requirements for this component. Therefore, before sealing or injecting a resin, an expert should be consulted who can assess aspects such as statics and the chances of success with larger cracks in a concrete wall.