Installation quality is as decisive as material quality in waterproofing. Even with the right material, incorrect detail solutions can cause leaks within a short time.
The Most Common Mistakes
- Insufficient Surface Preparation: Applying to dusty, loose or damp substrates reduces adhesion.
- Incorrect Material Selection: Using a product designed for positive pressure where negative pressure resistance is required.
- Joint and Corner Details: Failing to use corner tape and special detail profiles.
- Neglecting the Protection Layer: The waterproofing layer must be protected against mechanical impacts.
What Should the Correct Layered System Be?
Although it varies by application area, the basic principle is:
- Surface preparation and primer application
- Waterproofing membrane or liquid-applied waterproofing layer
- Reinforcing mesh and a second coat
- Protective screed or protection board
Details Are Vital
Drains, parapet upstands, column bases and expansion joints are waterproofing's weakest points. Extra precautions must be taken at these locations.
Site Conditions
Air temperature, humidity and rain risk must be checked during installation. Otherwise, curing remains incomplete and performance decreases.
Inspection and Maintenance
Waterproofing is not an “install and forget” measure. Regular maintenance, removal of ponding water and checking for cracks in coverings are particularly important on terraces and roofs.
Conclusion: Even a small waterproofing mistake can lead to major costs. Correct materials, correct installation and regular maintenance provide long-lasting protection.
