black and white bed linen

Your experts for permanent structural waterproofing and building protection.

Duracrista

The Permanent Solution Against Moisture

✔ Permanently stops rising damp

✔ Binds harmful salts within the masonry

✔ No new salt efflorescence

✔ No more flaking plaster or peeling paint

✔ Tested up to 0.75 bar – Proven in practice up to 1.5 bar water pressure resistance

✔ Can be applied at any time

✔ Non-invasive – no major structural work required

✔ Ideal for renovation and existing buildings, as well as new construction

✔ 100% radon-tight

✔ At least 10 years warranty


✔ Warranty extension up to 30 years possible

✔ Waterproofing & Insulation

✔ Tenant-Independent & Smart Ventilation

Damp Basement? Mould? Thermal Bridges?
Don't worry – we have the solution!
  • Interior waterproofing

  • Exterior waterproofing (façades, balconies, flat roofs, underground car parks, and more)

  • Waterproofing combined with interior or exterior insulation

  • Ventilation systems

  • Mould removal & prevention

  • And more


We bring the revolution in structural waterproofing directly to you. Our technologically advanced solutions succeed where conventional methods reach their limits – and they are MADE IN GERMANY.

Our Mission: Dry structures without compromise

Whether in the basement, on the facade, or on the roof – moisture damages the building fabric and reduces your quality of life. We provide a non-invasive method to efficiently protect buildings from the inside or outside.

Put an end to it – Once and for all!

  • No more rising damp: Stop wet walls caused by capillary moisture.

  • No more penetrating water pressure: We withstand even high water pressure. Practical experience shows that even 1.5 bar is not a problem.*

  • No more salt deposits on walls

  • No more flaking plaster or peeling paint

  • No more recurring annual repair costs for the same damaged areas

  • No increased risk of lung cancer – thanks to 100% radon protection

  • Wall, roof, and floor waterproofing: Comprehensive protection for the entire building envelope.

Isokristall
Isokristall

99,9% Success Rate**


At least 10 years warranty
Warranty extension up to 30 years

Feuchter Keller - Vorher - Nachher
Feuchter Keller - Vorher - Nachher

Izonil

What makes Izonil so special? – See for yourself...

Isokristall

When do I need Isokristall? – See for yourself...

Customer Testimonials

Legal Notice on the Authenticity of Reviews: Please note that the reviews published here originate from Google and Trustpilot. We place great importance on genuine and credible customer reviews and therefore check every review we receive for potential irregularities. However, we cannot conclusively verify in every individual case whether the person submitting a review has actually used our services, particularly where a pseudonym is used or where clear verification is not possible for other reasons.
We are legally required to provide this information.

Partnership against humidity
Partnership against humidity

Are you a construction company, tradesperson, painter or renovation specialist?

Your Benefits:

✔ More growth for your business

✔ More contracts and projects for your company

✔ No risk

✔ Proven and certified product for greater customer satisfaction

✔ Customer inquiries we receive are forwarded directly to you

✔ More revenue – More profit – More success

Offer this unique, certified and patented product to your customers.

Don’t wait until your competitors do.
Be among the first and secure your competitive advantage.

AI generated

Protect Your Home!

What happens if you do nothing?

WAITING WILL ONLY COST YOU MORE!

• Moisture spreads to the rooms above

• Mould continues to spread

• Rent reductions and disputes with tenants

• Repair work and remediation costs increase significantly

• Your property loses value

• Your property may become difficult or even impossible to sell

• Structural stability may be compromised

• The building structure suffers long-term damage

Become Our Regional Partner

We Are Looking for Qualified Craft & Construction Businesses

Coming soon...

black blue and yellow textile
black blue and yellow textile
a man riding a skateboard down the side of a ramp
a man riding a skateboard down the side of a ramp
a man riding a skateboard down a street next to tall buildings
a man riding a skateboard down a street next to tall buildings

* At the MFPA Leipzig testing institute, a maximum test pressure of 0.75 bar was possible. Isokristall passed this test without any issues (see test report).

In Germany, buildings located up to 15 meters below groundwater level have already been waterproofed and have withstood hydrostatic pressure of 1.5 bar for many years.

**According to the manufacturer’s information as of February 2026.