Roli GmbH, based in Basel, is a regionally active and specialized service provider focused on leak detection and waterproofing inspections for flat roofs. We support property developers, architects, facility managers, and insurance companies in the reliable analysis and maintenance of flat roof systems – from single-family homes to industrial buildings.

With years of experience and the use of advanced technologies, we are a trusted partner for precise, non-invasive leak detection, technically sound inspection methods, and clear, structured documentation. Our guiding principle: Find the root cause – not just treat the symptoms.

Our Core Services

Flat Roof Leak Detection
Using cutting-edge technologies such as moisture sensors, smoke tests, thermography, and electronic pulse systems, we locate weaknesses quickly and accurately – even in complex roof constructions.

Waterproofing Integrity Testing
For both new and existing buildings, we verify the performance of waterproofing systems before handover or use – with fully documented, protocol-based and independent testing procedures.

Roof Inspection with Report
We carry out structured condition assessments of flat roofs, including photo documentation and maintenance recommendations – ideal for damage prevention or decision-making in renovations.

Expertise Across All Roof Types
Experienced in cold roofs, warm roofs, inverted roofs, green roofs, and walkable/drivable roof systems.

Who We Work With

• Architects & General Contractors – for acceptance tests or quality assurance

• Property Managers & Homeowners – for water damage diagnostics, leak assessment or renovation planning

• Insurance Companies & Surveyors – for neutral and technical evaluations

• Industrial & Commercial Clients – for routine roof checks and safety assessments

Locally Rooted – Available Nationwide

Our core service area includes Basel, Basel-Landschaft, Aargau, Solothurn, and the Northwestern Switzerland region. Upon request, we are also available throughout Switzerland. Flexibility, short response times, and clear communication are our daily standards.

Why Roli GmbH?

• Independent & Objective: We don’t sell sealing materials – we identify causes.

• Technically Reliable: Use of professional-grade tools and methods

• Documented & Transparent: You receive clear inspection reports, including testing protocols if needed

• Client-Focused: Personal consultation, transparent process, and fair pricing

Roli GmbH – We make flat roofs understandable. A hidden leak? We’ll find it – before it becomes expensive.