What Wierig Gruppe does

Wierig Gruppe is a family-owned German provider of industrial and commercial flat roofing, waterproofing, integrated photovoltaic systems, and roof management services, headquartered in Siegburg and operating nationwide since its founding in 1893. The company's core offering centers on new construction, renovation, and waterproofing of industrial and commercial flat roofs, using materials and systems including EPDM, PVC, FPO, bitumen, and liquid-applied waterproofing (PMMA, PU, UP), delivered alongside integrated photovoltaic installation through its solar energiezukunft GmbH and KRAFTWERK Solutions GmbH subsidiaries. Specialty capabilities include proprietary sensor-based roof monitoring (R.O.S.I. passive sensors using the HV SLD method, ROOF PROTECTOR active sensors), aerodynamic PV mounting systems, KRAFTDACH ice-energy storage for combined solar, heat pump, and thermal storage operation, and TRGS 519-compliant asbestos remediation.

The business operates a project-based B2B model with direct enterprise sales targeting industrial facility owners, logistics operators, automotive manufacturers, retail chains, and food retailers. Revenue is generated primarily through one-time project contracts for roof construction, renovation, and PV installation, supplemented by recurring maintenance and monitoring contracts via Wierig Services GmbH, and by liquid waterproofing services via Wierig Liquid GmbH. Pricing is custom and project-quoted rather than published. The company serves enterprise customers including Deutsche Post DHL (over 20 parcel centers, >150,000 m²), Mercedes-Benz (Germersheim logistics center, 100,000 m²), BMW (Regensburg, 100,000 m²), Globus, Hornbach, and other major German commercial and industrial operators.

Wierig is led by fourth-generation family members Thomas and Christoph Wierig alongside managing directors Michael Huhn and Matthias Weik. Since 2025 the group operates as part of dach energiezukunft GmbH (DEZ-Gruppe), a holding that also includes JNS Dachtechnik and Schmidt Bedachung Hamburg. Distribution is delivered through the Siegburg headquarters, branch offices in Plankstadt (Mannheim region, since 2010) and Wolfsburg (since January 2025), plus group locations in Hamburg and Munich. The company employs over 200 people at the Wierig level and over 300 across the DEZ-Gruppe, and holds DIN EN ISO 9001:2015, DIN EN ISO 45001:2018, Poyry prequalification (since 2016), RAL Gütegemeinschaft Flachdach membership, and the Creditreform CrefoZert (top 2% of German companies) certification obtained in January 2026.

Name

Wierig Gruppe

Legal name

Wierig GmbH Dach und Fassade

Website

https://wierig.de

Company type

Private

Founded year

1893

Operating status

Operating

Short description

Wierig Gruppe is a family-owned German provider of industrial and commercial flat roofing, waterproofing, integrated photovoltaic systems, and roof management services, serving enterprise customers nationwide since 1893 through multiple subsidiaries and branch offices.

Ownership category

akta.pro rank

Product category

Commercial and Industrial Flat Roofing Services

NAICS

Roofing Contractors (23816), Roofing Contractors (238160), Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

Asphalt Paving & Roofing Materials (2950)

akta.pro primary industry

Roof-Mounted Systems Integration (PV, Green Roofs, Roof Gardens, Snow Guards) (IMAFAMAI)

akta.pro secondary industries

Roof Repair & Leak Remediation (HSAPAKAB), Skylights, Roof Windows & Daylighting (IMADAFAL), Roof Flashing, Vent & Penetration Repair (Chimney/Skylight/Pipe Boots) (HSAGAKAF)

Keywords

• Industrial flat roofing
• Commercial roof waterproofing
• Photovoltaic installation
• Roof management services
• Flat roof construction

Headquarters

HQ city

Siegburg

HQ country

Germany

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Flachdachbau – Neubau und Sanierung (Flat Roof Construction – New Build and Renovation): Project-based revenue from construction, renovation, and waterproofing of industrial and commercial flat roofs. Includes demolition of old roofs, asbestos remediation, insulation, membrane installation, green roof systems, and gravel Ballast. Revenue is one-time per project, with follow-up maintenance contracts.
2. Photovoltaik-/Solar-Anlagen (PV/Solar Installation): Design, supply, and installation of photovoltaic systems on flat roofs. Includes aerodynamic mounting systems, bifacial modules, tracking systems, and integrated PV solutions. Often bundled with roof construction/rehabilitation projects. Revenue recognized per project.
3. Roof Management – Wartung, Monitoring, Leckageortung (Roof Management – Maintenance, Monitoring, Leak Detection): Ongoing services including regular roof inspections, tightness testing, leak detection, moisture measurement, safety system inspections, roof area measurement and photo documentation, and monitoring system installation. Can be structured as maintenance contracts.
4. Flüssigkunststoffabdichtung (Liquid Waterproofing): Application of liquid-applied waterproofing systems (PMMA, PU, UP) for building waterproofing – flat roofs, underground garages, parking decks, balconies, terraces. Project-based revenue for both new build and renovation.

Pricing tiers

Go-to-market motion1 record

Distribution channels6 records

Marketing channels6 records

Core offering

Wierig Gruppe provides industrial and commercial flat roof construction, renovation, and waterproofing services, complemented by integrated photovoltaic (PV) system design and installation and ongoing Roof Management (maintenance, monitoring, leak detection) for enterprise building owners. Deliverables span new builds, refurbishment of aging roofs, asbestos remediation, green roof systems, safety systems (fall protection, anchor points, lightning and fire protection), and the proprietary KRAFTDACH ice-energy storage concept combining solar, heat pumps, and seasonal storage. Customers are large industrial, logistics, retail, and automotive enterprises with expansive flat roofs, served nationwide across Germany through the Siegburg headquarters and branch offices in Plankstadt (Mannheim) and Wolfsburg.

Product overview

Wierig Gruppe is a family-owned company (founded 1893) offering comprehensive flat roof solutions for industrial and commercial buildings. The core offering centers on the Industrie- und Gewerbeflachdach (Industry and Commercial Flat Roofs) service, complemented by specialized sub-brands: Wierig Liquid GmbH handles Flüssigabdichtung (liquid waterproofing), while solar energiezukunft GmbH and KRAFTWERK Solutions GmbH manage Solar/Photovoltaikanlagen and the innovative Kraftdach energy solution. Add-on modules include Roof Management (maintenance, monitoring, leak detection), Dachbegrünung (roof greening), Sicherheit (safety systems), Asbestsanierung (asbestos remediation), and Dachmonitoring (sensor-based monitoring). Wierig Services GmbH provides service operations. The company operates as part of the DEZ-Gruppe (dach energiezukunft GmbH) since 2025.

Differentiator

Problem solved

Functional benefit

Brands

• Wierig Solar: Photovoltaic and solar energy solutions for flat roofs, including planning and installation of PV systems.
• Wierig Liquid
• Wierig Roof Management
• KRAFTDACH

Products and services

• Industrial and Commercial Flat Roof Construction (Industrie- und Gewerbeflachdach) Construction, renovation, and waterproofing of industrial and commercial flat roofs for enterprise customers, including new builds, refurbishment, demolition of old roofs, insulation, and gravel ballast using premium materials (EPDM, PVC, FPO, bitumen).
• Liquid Waterproofing (Flüssigabdichtung / Flüssigkunststoffabdichtung) Liquid plastic waterproofing using PMMA, PU, and UP systems for flat roofs, underground garages, parking decks, balconies, and terraces, particularly suited to complex geometries, delivered by subsidiary Wierig Liquid GmbH.
• Solar / Photovoltaic Systems (Solar/Photovoltaikanlagen) Planning, design, and installation of photovoltaic systems on flat roofs for enterprise customers, including aerodynamic non-penetrating mounting structures, bifacial modules, tracking systems, and integrated PV solutions, delivered via solar energiezukunft GmbH and KRAFTWERK Solutions GmbH.
• Roof Management (Wartung, Monitoring, Leckageortung) Ongoing roof management services including regular inspections, tightness testing, leak detection, moisture measurement, safety system inspections, photo documentation, and monitoring system installation, delivered via Wierig Services GmbH and typically contracted as recurring service agreements.
• KRAFTDACH Ice Energy Storage Concept (Kraftdach – Eis-Energiespeicher) Innovative energy concept that combines solar power generation with heat pump operation and ice energy storage, directing excess heat to the ice storage to support heating in winter or building cooling in summer, with the goal of reducing long-term energy costs and providing predictable planning.

Quantifiable outcome

• Over 1,000,000 m² of roof area successfully renovated across all projects
• +6 more outcomes

Named customers11 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core.

• solar energiezukunft GmbHcoreTechnology or IntegrationSpecialist solar subsidiary of the Wierig Group, founded 2009. Focuses exclusively on photovoltaic systems. Shares headquarters location in Siegburg (Lindenstraße 76) and operates under its own management (Matthias Weik, Bernd Laufenberg). Provides the solar/PV component of Wierig's integrated flat roof + energy offering. Handles project planning, installation, and potentially the KRAFTDACH ice-energy storage systems.
• Wierig Liquid GmbH (Abdichtungstechnik)coreTechnology or IntegrationSpecialist liquid waterproofing subsidiary, spun off from Wierig in 2006. Focused on building waterproofing using liquid-applied systems (PMMA, PU, UP) for flat roofs, underground garages, parking decks, balconies, and terraces. Led by Michael Huhn (also Wierig Managing Director). Located in Plankstadt. Provides specialized liquid waterproofing services within the Wierig Group ecosystem.
• Wierig Services GmbHcoreImplementation/ SI/ Consulting PartnerService subsidiary founded in 2018 in Plankstadt. Bundles all Roof Management services including flat roof maintenance and care, roof consulting, roof monitoring, leak detection and tightness testing, plus trade in machines and accessories for the industry. Provides ongoing service relationships with existing customers, complementing project-based work.
• dach energiezukunft GmbH (DEZ-Gruppe / dez Gruppe)coreStrategic or Co-development PartnerParent company of Wierig since 2025. The DEZ-Gruppe (dach energiezukunft) is a holding/group structure bundling over 130 years of roofing and PV expertise across multiple companies. Wierig became part of DEZ-Gruppe in 2025. Group also includes JNS Dachtechnik and Schmidt Bedachung Hamburg. Group-wide: >300 employees, 7 locations, >1,000,000 m² roofs renovated, >100 MWp PV installed.

Scale indicators8 records

Recent moves14 records

Expansion highlights5 records

Broad incumbents

• BMI Group (Braas / Icopal): Pan-European roofing and waterproofing incumbent (including German heritage brands Braas and Icopal) covering pitched and flat roofs across residential, commercial, and industrial segments — broader scope than Wierig but overlapping directly in commercial flat-roof waterproofing.
• KÖSTER Bauchemie AG: German manufacturer of waterproofing systems (bitumen, liquid plastics, injection sealants) for roofs, basements, and infrastructure — comparable to Wierig on the waterproofing technology side, particularly the liquid-applied membrane portfolio at Wierig Liquid GmbH.
• Centrotec Sustainable AG: German publicly listed group focused on energy-efficient building technologies including heating, ventilation, and climate systems — comparable to the heating/cooling/KRAFTDACH component of Wierig's integrated roof-energy offering.
• Sika Deutschland GmbH: German subsidiary of Sika AG, supplying roofing membranes, liquid-applied waterproofing systems (Sarnafil, SikaRoof), and sealants — comparable to Wierig on the materials/waterproofing side, though Sika operates primarily as a manufacturer/supplier rather than an installer.

Emerging players

• 1Komma5° GmbH: Berlin-based German solar and heat-pump installer with a rapidly expanding franchise model across Germany — directly comparable to the PV/heat-pump integration that Wierig's KRAFTDACH concept addresses, though with stronger consumer-brand momentum and capital access.
• Enerix Franchise GmbH: German photovoltaic specialist with a regional-franchise model focused on residential and commercial rooftop PV — overlaps with solar energiezukunft in the German rooftop-PV installation market, particularly for flat-roof commercial customers.
• Enpal GmbH: Leading venture-backed German rooftop-solar installer offering leasing/PPA business models, increasingly active in commercial flat-roof PV — competes with Wierig's solar energiezukunft subsidiary on the same German rooftop PV opportunity.

Direct peers

• Wilhelm Müller GmbH & Co. KG: German family-owned flat-roof contractor (founded 1907) specializing in industrial and commercial flat-roof waterproofing, renovation, and maintenance — comparable scale and operating model to Wierig, including recurring roof-management services.
• Paul Bauder GmbH & Co. KG: One of Germany's largest flat-roof and waterproofing specialists, offering bitumen, plastic, and liquid-applied membranes plus insulation systems for industrial and commercial buildings — directly comparable to Wierig's core Industrie- und Gewerbeflachdach offering.

Regional players

• Bühler Bedachungen GmbH & Co. KG: Mid-sized German flat-roof and metal-roofing contractor serving commercial/industrial customers — comparable in service scope (waterproofing, PV, maintenance) and customer type to Wierig, though smaller in scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@wierig

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries6 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 Wierig Gruppe