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Damp walls in NRW?
wetBLOC – lastingly dry masonry.

Damp walls and basements in Nordrhein-Westfalen: our specialist partners examine the cause on site and plan suitable waterproofing — in Köln, Düsseldorf, Dortmund and the surrounding area.

  • Waterproofing from inside without excavation
  • Permanently dry walls and usable rooms again
  • 15-year system warranty
Fixed-priceWarranty
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Tom Coruk

Tom Coruk

Mon–Fri 8 am–8 pm · Sat 10 am–2 pm

Request an initial assessment now

5 short questions about your damp walls.

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How the waterproofing technology works

The swellable wetBLOC polymer gel waterproofs masonry from within against rising damp and lateral moisture ingress. It works horizontally and vertically while maintaining vapour permeability.

  • Effective horizontally and vertically within masonry
  • Stops capillary water transport and remains vapour-permeable
  • Suitable for existing, older and heritage-listed buildings
Understanding wetBLOC technology

Tested quality

Researched with Fraunhofer UMSICHT. Independent institutes tested moisture behaviour, compatibility and classification under chemicals legislation.

WTA & EPASIT

Masonry waterproofing guided by WTA principles, combined with certified EPASIT products for long-term moisture protection.

Quality assured

Trained specialists, clear application guidelines and documented procedures ensure consistently high workmanship.

15-year system warranty

wetBLOC and EPASIT provide a 15-year voluntary system warranty on the agreed waterproofing measure.

Our recipe for success

  • Identify the cause – before commissioning any work
  • Start within the wall – instead of just painting over stains
  • Protect gardens and surroundings – wetBLOC waterproofs from inside. Your garden and outdoor areas usually do not need to be excavated.
  • Coordinate waterproofing and plaster – as a coordinated plan
  • Understand effort and costs – before you decide
wetBLOC team visualisation in front of the vehicles
After: finished basement with flooring installed
Before: exposed masonry at the start of remediation
BeforeAfter

Your journey with us

  1. Illustrative image: personal contact by telephone

    Your enquiry to wetBLOC

    Our services

    • Investigate moisture
    • Waterproof masonry
    • Renovate walls
    • Upgrade your basement
  2. Illustrative image: on-site moisture measurement on a basement wall

    We investigate the cause

    We examine the damp areas, wall composition and cause of damage. This allows us to assess whether the wetBLOC system is suitable for your building.

  3. Illustrative image: discussing the renovation plan together

    Your remediation plan

    We discuss the right solution, the individual work steps and the costs. You receive a quotation tailored to your house and can decide in your own time.

  4. Tradesperson renovating a vaulted basement

    Remediation begins

    Tom and his team carry out your remediation. Your dedicated contact supports you on site.

Polymer-based waterproofing technology for masonry.

The technology acts in any direction, horizontally and vertically, along the natural capillary moisture pathways in masonry. Capillary water transport is selectively stopped without impairing water vapour diffusion or blocking building physics functions.


This allows the masonry to remain vapour-permeable and capable of drying. The system is specifically designed for use in existing buildings and is suitable for existing and older buildings as well as listed buildings with sensitive historic fabric.

Technology in detail

Advantages over conventional systems

How it works

Four methods compared. Open the diagrams and then compare all criteria.

Simplified illustration
wetBLOCSwellable polymer gel
Horizontal and vertical waterproofing against rising damp and lateral moisture ingress. 45° drill holes at the base of the wall form the lower barrier. Further rows of packers distribute the gel across the treated wall surface.
Wall sawing method
A barrier layer in the horizontal saw cut above the lowest course of masonry forms the barrier. No protection against lateral moisture. Gaps can allow moisture through.
Injection resins
Resin is injected from the front and forms a horizontal barrier zone above the lowest course of masonry. No protection against lateral moisture. Gaps can allow moisture through.
Water-repellent treatment
The product is injected from the front and forms a horizontal water-repellent zone. No protection against lateral moisture. Gaps can allow moisture through.
  • Blue: moistureWater and damp areas in the masonry.
  • Turquoise: gel zoneHorizontal and vertical waterproofing zone with wetBLOC gel.
  • Red: barrier levelHorizontal barrier used by the comparison methods.

wetBLOC
Minimal
Wall sawing method
High
Injection resins
Medium
Water-repellent treatment
Minimal

wetBLOC
Very good
Wall sawing method
Good
Injection resins
Conditional
Water-repellent treatment
Low

wetBLOC
High
Wall sawing method
High
Injection resins
Medium
Water-repellent treatment
Medium

wetBLOC
Yes
Wall sawing method
Yes
Injection resins
No
Water-repellent treatment
Yes

wetBLOC
Yes
Wall sawing method
Yes
Injection resins
Yes
Water-repellent treatment
Yes

wetBLOC
Yes
Wall sawing method
No
Injection resins
No
Water-repellent treatment
No

wetBLOC
360°
Wall sawing method
Horizontal
Injection resins
Limited
Water-repellent treatment
Limited

wetBLOC
15 years
Wall sawing method
Variable
Injection resins
Variable
Water-repellent treatment
Variable
CriterionOur systemSwellable polymer gelWall sawing methodInjection resinsWater-repellent treatment
How it worksSimplified illustration
  • Blue: moistureWater and damp areas in the masonry.
  • Turquoise: gel zoneHorizontal and vertical waterproofing zone with wetBLOC gel.
  • Red: barrier levelHorizontal barrier used by the comparison methods.
Horizontal and vertical waterproofing against rising damp and lateral moisture ingress. 45° drill holes at the base of the wall form the lower barrier. Further rows of packers distribute the gel across the treated wall surface.
A barrier layer in the horizontal saw cut above the lowest course of masonry forms the barrier. No protection against lateral moisture. Gaps can allow moisture through.
Resin is injected from the front and forms a horizontal barrier zone above the lowest course of masonry. No protection against lateral moisture. Gaps can allow moisture through.
The product is injected from the front and forms a horizontal water-repellent zone. No protection against lateral moisture. Gaps can allow moisture through.
Minimal High Medium Minimal
Very good Good Conditional Low
High High Medium Medium
Yes Yes No Yes
Yes Yes Yes Yes
Yes No No No
360° Horizontal Limited Limited
15 years Variable Variable Variable

What makes our approach special

After the on-site assessment, we tailor the waterproofing to your Wall construction and moisture pathways. Through targeted drill holes, we introduce the swellable wetBLOC polymer gel into the pore and capillary system. There it forms a Waterproofing zone: horizontally against rising damp or across the surface as a vertical barrier against lateral moisture ingress, adapted to the findings on site. The work is completed with a matching, vapour-permeable renovation plaster, which can release residual moisture as water vapour and store salts.

Up to 20%
remediate at lower cost

In our experience, the efficient wetBLOC method can save you up to 20% compared with comparable renovation quotations.

Six reference buildings from BAUTECHNOLOGY: older, existing and heritage-listed buildings

3500+ Total properties successfully completed with wetBLOC.

Your local contacts.

Tom Coruk, project manager for the NRW region

Tom Coruk

Project manager for the NRW region

wetBLOC team visualisation in front of the vehicles

Our coverage areas

From Aachen, we support your renovation in Nordrhein-Westfalen — in Rheinland, Ruhrgebiet, Münsterland and Ostwestfalen.

Major cities in our service area:

KölnDüsseldorfDortmundEssenDuisburgBochumWuppertalBielefeldBonnMünsterAachen
Enquire about remediation in your region
wetBLOC in Nordrhein-Westfalen – highlighted service areaActive: Nordrhein-Westfalen, Baden-Württemberg, Hessen, Bremen, Eastern Switzerland, Central Switzerland, Greater Zürich and Ticino. A further 12 German federal states are planned. In Eastern Switzerland, Schaffhausen, Thurgau, St. Gallen, both Appenzell cantons, Glarus and Graubünden are highlighted. Cities provide orientation; Mannheim is in Baden-Württemberg and also handles enquiries from Hessen.Sachsen · PlannedBayern · PlannedRheinland-Pfalz · PlannedSaarland · PlannedSchleswig-Holstein · PlannedNiedersachsen · PlannedBrandenburg · PlannedMecklenburg-Vorpommern · PlannedHamburg · PlannedThüringen · PlannedSachsen-Anhalt · PlannedBerlin · PlannedNordrhein-Westfalen · ActiveBaden-Württemberg · ActiveBremen · ActiveHessen · ActiveGraubündenSchaffhausenThurgauSankt GallenGlarusAppenzell AusserrhodenAppenzell InnerrhodenLucerneZugUriSchwyzNidwaldenObwaldenCentralSwitzerlandNordrhein-WestfalenBaden-WürttembergBremenHessenEastern SwitzerlandGreater Zürich areaTicinoAachenKölnBonnDüsseldorfEssenDortmundMünsterBielefeld
Active regionsExpansion areas

Walls become possibilities.

wetBLOC employee carrying out area injection: rows of packers across two exposed basement walls
At the start of remediation: wetBLOC basement project
The treated wall surface: wetBLOC basement project
Space made usable again: wetBLOC basement project
Renovation in the vaulted basement

Consultation in Nordrhein-Westfalen

Where is waterproofing needed?

Questions about remediation in NRW.

Still unsure? Start by simply describing what you have noticed.

Is wetBLOC suitable for my wall?

wetBLOC is suitable for almost all capillary-porous masonry types, including brick, sand-lime brick, natural stone and hollow blocks.

The polymer gel acts directly in the masonry's pore and capillary system. Wall construction and existing moisture pathways are decisive.

Will my garden or outdoor areas need to be excavated?

No, usually not. wetBLOC is introduced directly into the masonry from inside. Your garden and outdoor areas can therefore usually be preserved, without extensive earthworks.

We assess on site whether additional waterproofing measures are needed in each case.

Who visits me and carries out the work?

wetBLOC is our waterproofing technology. The work is carried out by specially trained wetBLOC base partners and specialist contractors. Our regional partners support you from initial advice through to professional execution.

How much does remediation cost?

Costs depend on the size of the affected wall surfaces, the masonry and the extent of remediation required.

Our site visit is free. You then receive your individual fixed-price quotation within 24 hours.

Up to 20% cheaper in our experience: our efficient wetBLOC method can deliver significant savings compared with comparable remediation methods.

What happens after my enquiry?

We will contact you personally, discuss your situation and, if needed, arrange a free on-site appointment. We examine the moisture and wall construction to offer you a suitable renovation solution with an individual fixed-price quotation.

In which cities in NRW does wetBLOC operate?

From Aachen, we support projects in Rheinland, Ruhrgebiet, Münsterland and Ostwestfalen – including Köln, Düsseldorf, Dortmund, Essen, Duisburg, Bochum, Wuppertal, Bielefeld, Bonn and Münster. Tell us your town and postcode so we can coordinate.

Who is my contact for Nordrhein-Westfalen?

Tom Coruk is your project manager for NRW and a master craftsman in masonry and concrete construction. He is your contact for coordinating your remediation project.

Can I enquire from outside the listed NRW cities?

Yes. The listed cities are for guidance. You can also enquire about buildings in the surrounding area. We will clarify how we can support your project based on its location.

What details help with an on-site appointment in NRW?

Tell us the town and postcode, the affected rooms and the visible moisture damage. If known, the year of construction and wall material are also helpful. We will then arrange the appointment with you personally.

Discuss your renovation project with wetBLOC

Your regional wetBLOC specialist partner assesses the building conditions and works with you to develop a remediation plan tailored to your building.

Request a consultation