Hydrophobic is the water-repellent treatment of surfaces. A previously absorbent surface is coated in such a way that it repels water. The word "hydrophobic" means "avoiding water".
Treatment of clinker necessary?
Clinkers are very hard fired and often glazed stones. For this reason, they are inherently completely impermeable to water. After all, clinker facades themselves are the weather protection of the facade.
Useful water repellency
Some still recommend water repellency, especially in the following cases:
already slight damage or hairline cracks
- slight frost damage
- water absorbing ("sucking") bricks
- In some cases bricks may be slightly absorbent. Over time and through the aging process, water absorption also increases slightly. As a rule, however, bricks that absorb water are inferior bricks
KS facing bricks
Make sure that your façade is actually a clinker façade! There are also white bricks made of limestone (KS) - these bricks are not clinker and strongly absorbent. They are usually rendered hydrophobic at the factory, but the treatment should be repeated at regular intervals.
Impregnation during refurbishment
If clinker facades are to be renovated, rehabilitation companies often recommend impregnating the renovated façade. At least the "weather side" of the house should then be impregnated in any case.
The reason is that damage has already occurred that needs to be remedied during remediation. So a hydrophobing is actually often useful here.
Tips & TricksWhen applying the water repellent treatment, it is best to contact a specialist company. Some systems can be applied by themselves, but a professional assessment of the facade before applying permanent seals is always advisable.