Core service

Flat roofs think differently. Our planning too.

A flat roof provides no predefined pitch – that sounds like freedom, but it is a planning challenge. Load distribution, wind uplift, roof membrane integrity and maintenance access determine the long-term success of a PV system. In Switzerland, an increasing number of multi-family buildings, commercial properties and industrial halls are being equipped with flat-roof PV. Vigorek designs these systems not as module areas on paper, but as engineered solutions on the building.

System logic

Flat-roof PV demands more than module rows on paper: wind load verification per SIA 261, roof membrane protection and SUVA-compliant fall protection are part of every Vigorek project scope. For multi-family buildings, commercial properties and industrial halls in Switzerland.

Configure for freeHow we work

No standard price – every roof is different. → Configurator for an individual estimate.

Project profile

Typical use case

Multi-family buildings and commercial properties with large flat roofs where vZEV (from 2025) or LEG models (from 2026) are to be integrated from the outset.

Coverage

Planning, PV installation, electrical coordination and commissioning across German-speaking Switzerland.

Contact

info@vigorek.ch+41 78 240 07 28
Kirchweg 32
8102 Oberengstringen
Zürich, CH

Scope of service

What you can expect from us.

Transparency from initial planning to completed installation. We show you exactly which steps we handle and what matters most during execution.

01
Scope of work

What this service concretely covers.

The scope is structured so roof work, electrical work, day-to-day use and future upgrades stay aligned. That is what creates a cleaner execution.

Scope of work

  • Mounting concept based on wind zone, snow load and roof-edge clearance – ballasted or penetrating, with a traceable wind load verification per SIA 261.
  • East-west or south layout matched to available roof area, self-consumption profile and ballast requirements – with realistic yield ranges rather than averages.
  • Protection concept for the roof membrane (separation fleece), maintenance walkways (min. 20 cm foot clearance) and SUVA-compliant fall protection with guardrails from 1 m height.
  • Structurally coordinated planning: PV dead loads, snow and wind loads per SIA 261, and existing roof structures – verified as a requirement, not an option.
02
Why this is chosen

Where owners and operators feel the difference.

This service becomes relevant when not only the result matters, but also ownership, traceability and a dependable project flow.

Why this is chosen

  • Ballast concept with traceable wind load calculations – no rule-of-thumb estimates for roof edges and corners, where uplift forces on a 10 kWp system can reach several tonnes.
  • East-west vs. south: we calculate both variants – sometimes 10–30% less yield per module translates to up to 40% more total output on the same roof area and a higher self-consumption share.
  • Maintenance walkways and fall protection are part of the project scope from the start, not an afterthought – including a written safety concept covering access routes and PPE requirements.
  • Every system receives a written safety concept: fall protection measures, access routes, PPE requirements and maintenance instructions for operators, property managers and service partners.
03
Typical application

Which projects this service fits especially well.

Not every building needs the same execution depth. These examples show where this service makes the biggest difference.

Typical application

  • Multi-family buildings and commercial properties with large flat roofs where vZEV (from 2025) or LEG models (from 2026) are to be integrated from the outset.
  • Industrial halls and warehouses with high self-consumption demand – with self-consumption rates up to 90% and payback periods of 7 to 10 years.
  • Buildings with green roofs where PV modules and planting substrate act together as a ballast system – and lower roof surface temperatures (below 35°C instead of up to 80°C) measurably increase power output.

The Founders

Engineering depth. Financial structure.

Two founders, two domains of expertise – one shared conviction: solar installations work long-term only when engineering and business case fit together from the start.

Christian Freiberger

Christian Freiberger

CFA · former KPMG Senior Manager

Co-Founder · Strategy & Finance

Independent management consultant since 2015 – previously Senior Manager at KPMG. Most recently Interim Treasury Manager at an energy storage manufacturer. Christian brings the financial structure: liquidity planning, transparent calculations, no project without a solid business case.

CFATreasuryBusiness case
Marc Hammerschmidt

Marc Hammerschmidt

B.Eng. Mechanical Engineering

Co-Founder · Engineering & Planning

Marc handles the technical side: planning, structural analysis, system integration and execution that remains traceable a decade later. An engineering mindset means no improvisation — only well-reasoned solutions for every roof.

Mechanical Eng.System planningStructural analysis

Regional Expertise

Locally rooted, experienced nationwide.

Every region has its own regulations, subsidies, and grid operators. We know the local conditions and support your project perfectly tailored to your location.

Regional fit

Our experience in your region.

Whether it's building permits, cantonal subsidies or registration with the local grid operator: a smooth execution requires local knowledge. Find specific information for your area here.

Regional page

Aargau

In Aargau, industrial and logistics buildings along major transport routes offer large-area flat roofs optimally suited for PV. AEW compensates at 11.15 Rp./kWh (including HKN), and the canton additionally supports battery storage. With over 520 MW of installed PV capacity, Aargau is among the leading solar cantons. PSI and PARK INNOVAARE create an environment that drives technological innovation in flat-roof planning.

Regional page

Basel-Landschaft

Basel-Landschaft offers a solar potential of approximately 1,430 GWh/a on roof and facade surfaces plus 50–150 GWh/a on infrastructure and open areas. Commercial buildings along the Ergolz and southern Jura slopes are the focus. The Energiepaket 2026–2030 supports combined roof renovation + PV with bonus contributions – a strong lever for flat-roof projects on existing buildings.

Regional page

Basel-Stadt

In Basel-Stadt, the theoretical solar potential on roof and facade surfaces covers approximately 800 GWh/a – enough for 60% of electricity demand. The solar offensive makes flat roofs mandatory surfaces during roof and facade renovations. IWB's contracting model lowers the entry barrier. On the dense urban building stock, flat-roof installations require special care with access, scaffolding and roof-skin protection.

Regional page

Bern

In Canton Bern, commercial buildings in the midlands and higher elevations in the Oberland present two fundamentally different flat-roof scenarios: in the midlands, standard structural analysis and quick approvals matter; in the Oberland, snow loads (SIA 261) and elevated wind exposure dominate. Bifacial modules on Oberland flat roofs exploit snow reflection – but require adapted mounting geometry.

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