ISOTEC Waltermann & Zwiener GmbH

What ISOTEC Waltermann & Zwiener GmbH does

ISOTEC Waltermann & Zwiener GmbH (legal entity: ISOTEC GmbH) is a German building-renovation service company founded in 1990 and headquartered in Bergisch Gladbach. The company specializes exclusively in the diagnosis, remediation, and prevention of moisture damage and mold infestation in buildings, serving primarily private homeowners and residential property owners, with secondary work for commercial and public buildings (arenas, schools, community facilities). It addresses problems including rising damp, penetrating moisture, condensation, water damage, and mold growth, offering end-to-end project delivery from on-site damage analysis through custom Sanierungskonzept (renovation concept) to fixed-price execution.

The technical core is a portfolio of proprietary branded systems: ISOTEC-Kombiflexabdichtung (two-layer interior waterproofing, MPA NRW-certified at 0.75 bar), ISOTEC-VAS-Abdichtung, ISOTEC-Spezialparaffin (heated paraffin injection forming a 15cm horizontal capillary barrier against rising damp), ISOTEC-Flexbandsystem (elastic sealing of cracks and wall-floor joints), and the ISOTEC-Klimaplatte (calcium-silicate interior insulation panel with general technical approval from the German Institute for Civil Engineering). Supporting services include technical drying using HEPA-filtered condensate systems, balcony, basement-floor, basement-ceiling, garage, and interior insulation renovation. The company delivers these services through a franchise network of more than 85 independent ISOTEC-Fachbetriebe at 150+ locations across Germany and a presence in Mallorca, with quality oversight via TÜV Rheinland certification and standardized training through the ISOTEC Academy.

The business model is a professional-services franchise system: the central ISOTEC GmbH acts as system center and franchisor, generating revenue from franchise relationships, proprietary system supply, and training, while 85+ independently owned regional specialist companies deliver on-site remediation on a project-based fixed-price model. Customer reach exceeds 120,000 completed projects cumulatively, at a run rate of approximately 12,000 renovations per year, supported by a 10-year warranty, a complaint rate below 1%, and a 4.6/5.0 rating across 51,258 reviews. The Group employs more than 1,200 people and is led by Managing Directors Horst Becker, Tino Becker, and Stephan Führling. No public revenue disclosure, funding, or M&A activity is on record.

Name

ISOTEC Waltermann & Zwiener GmbH

Legal name

ISOTEC GmbH

Website

https://isotec.de

Company type

Private

Founded year

1990

Operating status

Operating

Headcount range

501–1,000 employees

Short description

ISOTEC Waltermann & Zwiener GmbH is a German franchise system, founded 1990, that diagnoses and remediates moisture damage and mold in buildings. It serves primarily private residential homeowners and some commercial/public buildings across 150+ locations in Germany and Mallorca via 85+ specialist franchisees using proprietary waterproofing and climate-control systems.

Ownership category

akta.pro rank

Product category

Building Restoration Services

NAICS

Drywall and Insulation Contractors (238310)

SIC

Services-Miscellaneous Repair Services (7600)

akta.pro primary industry

Waterproof Coatings & Leak Sealing (Basements, Foundations, Roof Coatings) (HSAGADAI)

Keywords

• Building waterproofing services
• Moisture damage remediation
• Mold removal services
• Building renovation services
• Basement sealing systems

Headquarters

HQ city

Kürten

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Supply Chain

Revenue model

1. Professional renovation and remediation services: ISOTEC provides fee-for-service professional renovation work for moisture and mold damage remediation. Services include waterproofing, mold removal, drying, balcony renovation, basement floor renovation, garage renovation, interior insulation, and cellar ceiling insulation. Revenue is generated through project-based fees for on-site analysis, custom Sanierungskonzepte (renovation concepts), and execution of remediation work. The company operates on a fixed-price model where technically feasible and scope definable.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

ISOTEC provides specialized building renovation services focused on moisture damage remediation and mold prevention in residential, commercial, and public buildings. The company uses proprietary systems including ISOTEC-Kombiflexabdichtung (two-layer waterproofing), ISOTEC-Spezialparaffin (horizontal barrier paraffin injection), ISOTEC-Flexbandsystem (crack sealing), and ISOTEC-Klimaplatte (calcium silicate climate boards). Services are delivered through a franchise network of over 85 regional specialist companies (ISOTEC-Fachbetriebe) operating at more than 150 locations across Germany.

Product overview

ISOTEC is a franchise-based service company offering specialized building renovation services focused on moisture damage remediation and mold prevention. The portfolio consists of nine core service offerings (waterproofing/sealing, mold removal, climate boards, balcony renovation, basement floor renovation, basement ceiling insulation, garage renovation, interior insulation, and drying systems) delivered through over 85 regional franchise specialist companies. Key proprietary systems include ISOTEC-Kombiflexabdichtung (two-layer waterproofing), ISOTEC-VAS-Abdichtung, ISOTEC-Spezialparaffin (horizontal barrier injection), and ISOTEC-Flexbandsystem (crack sealing). The company operates as a service provider rather than a product manufacturer, with services built around proprietary branded systems and supported by the ISOTEC Academy for staff training.

Differentiator

Problem solved

Functional benefit

Brands

• ISOTEC-Kombiflexabdichtung: Two-layer interior waterproofing system for sealing walls and foundations.
• ISOTEC-VAS-Abdichtung
• ISOTEC-Spezialparaffin
• ISOTEC-Flexbandsystem
• ISOTEC-Klimaplatte

Products and services

• ISOTEC Abdichtung (Waterproofing/Sealing)

Quantifiable outcome

• 120,000+ successful remediation projects completed
• +6 more outcomes

Named customers6 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators10 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• BELFOR: Global leader in property damage restoration (water, fire, mold) serving commercial and residential customers. Comparable because BELFOR competes with ISOTEC for major water-damage and mold-remediation engagements, especially across commercial and public-building projects.
• KÖSTER Bauchemie: Manufacturer of waterproofing systems, crack-injection resins and negative-side waterproofing products used in basement sealing. Overlaps with ISOTEC's Kombiflex, Flexbandsystem and horizontal-barrier services at the materials level.
• Polygon Group: European property-damage restoration and climate-control services provider offering water-damage drying, mold remediation and building drying. Overlaps with ISOTEC's drying systems, climate-board insulation and moisture-damage remediation work across European markets.
• Remmers GmbH: German building-preservation specialist producing waterproofing coatings, masonry protection and restoration systems. Comparable to ISOTEC through its overlapping waterproofing and damp-proofing product portfolio used by German restoration contractors.

Direct peers

• Paul Davis Restoration: North-American franchise network for water, fire and mold damage restoration with a similar local-franchise, standardized-methods GTM model. Useful template-comparable to ISOTEC's franchise system for moisture and mold work.
• Servpro: Large US-based franchise network specializing in water, fire and mold damage cleanup and restoration. Comparable to ISOTEC in being a systemized brand with proprietary methods and tightly controlled franchisees delivering moisture/mold remediation nationwide.
• Getifix: German franchise network offering moisture-damage remediation, basement waterproofing, mold removal and interior insulation for residential properties — a near-direct analogue of the ISOTEC Fachbetrieb model, competing for the same homeowners across Germany.

Emerging players

• Trotec GmbH: Provider of professional drying, dehumidification and measurement equipment for water-damage restoration. Overlaps with ISOTEC's technical-drying (Trocknung) service line and competes for the same restoration contractors and project pipelines in Germany and Europe.

Others

• Sanierputz / quick-mix (Sievert SE): German building-materials supplier offering renovation plasters, waterproofing renders and masonry-protection systems used by trades firms. Relevant as a complementary supplier-side player in ISOTEC's waterproofing-render and interior-insulation ecosystem.

Regional players

• BWS Group (BWS Bauwerkserhaltung): German building-preservation contractor offering concrete repair, waterproofing and facade-renovation services. Comparable to ISOTEC's waterproofing and structural-sealing segments, particularly for commercial and public-building clients in Germany.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights6 records

Customer concentration

• Xx.com/isotecowl
• YouTubeyoutube.com/user/ISOTECgmbh
• Facebookfacebook.com/isotec.owl
• LinkedInlinkedin.com/company/isotec-gmbh
• Instagraminstagram.com/isotec_gmbh
• TikToktiktok.com/@isotec_gmbh

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ISOTEC Waltermann & Zwiener GmbH