High-performance cast architectural concrete by BARKA offers maximum durability, and one of its key parameters for water features is waterproofing class W20.
What the W indicator means?
The waterproofing class “W” ranges from W2 to W20.
Higher values indicate lower porosity and greater resistance to water penetration.
Long-term performance in water requires concrete starting from W12.
W20 is the highest class defined by GOST. In practice, our samples can exceed this level
How waterproofing is determined
There are two certified laboratory methods:
1. By filtration coefficient, measuring the rate of water penetration through concrete.
2. By maximum water-pressure resistance (“wet spot” method).
Both methods confirm that BARKA concrete meets class W20.
Why W20 matters for water features
Water is the most aggressive test for concrete: low-grade materials crack, leach and degrade within the first season.
Concrete with W20:
– does not leak,
– maintains appearance for decades,
– does not require frequent restoration.
How we achieve W20
– Cast technology eliminates voids and microcracks.
– Mineral fillers reduce capillary porosity.
– Automated production ensures uniform structure.
Although standards end at W20, our mixes often perform above this threshold.
For the client, this means durable façades, reliable landscaping elements and long-lasting water features.
