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Flat-Roof Photovoltaics Graubünden – Loads, Roof Protection and Mounting

Flat roofs in Canton Graubünden offer large PV potential – provided mounting angles, wind loads and maintenance access are aligned before installation. This page focuses on exactly that planning step.

Local system fit

In Canton Graubünden, flat roofs on commercial buildings and multi-family homes represent the largest untapped solar area. Graubünden considers the specific conditions of high altitude in its energy law. New buildings have self-generation requirements, taking into account the extreme climatic conditions in mountain municipalities.

Flat-roof photovoltaics in Graubünden requires technically coordinated planning: wind load verification per SIA 261, roof membrane protection and SUVA-compliant fall protection are fixed components of every Vigorek project. The choice between east-west and south orientation is calculated individually based on available roof area, self-consumption profile and ballast requirements.

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Project profile

Location

Graubünden

Service focus

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.

Regional fit

In Canton Graubünden, flat roofs on commercial buildings and multi-family homes represent the largest untapped solar area. Graubünden considers the specific conditions of high altitude in its energy law. New buildings have self-generation requirements, taking into account the extreme climatic conditions in mountain municipalities.

Context

How this service works in Graubünden in practice.

Graubünden comes with its own framework conditions – from incentives and tax treatment to technical requirements. This page shows how those translate into a clean project flow for your property.

01
Service focus

What matters most for flat roofs

Flat roofs in Canton Graubünden offer large PV potential – provided mounting angles, wind loads and maintenance access are aligned before installation. This page focuses on exactly that planning step. 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.

Service focus

  • 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
Regional framework

Why this canton shifts the priorities

In Canton Graubünden, flat roofs on commercial buildings and multi-family homes represent the largest untapped solar area. Graubünden considers the specific conditions of high altitude in its energy law. New buildings have self-generation requirements, taking into account the extreme climatic conditions in mountain municipalities. Graubünden: pioneer of high-alpine solar systems. Nalpsolar (10 MW, 13 GWh/year at 2,000m), Scharinas (18.3 MW, 29 GWh/year, 13 GWh winter!). CHF 600/kWp facade subsidy = highest in Switzerland. Davos & St. Moritz: premium clientele + alpine peak conditions.

Regional framework

  • In Canton Graubünden, load distribution, wind uplift and roof-skin protection must be resolved before ordering materials.
  • Flat roofs require a different mounting concept than pitched roofs – standard solutions often lead to change orders.
  • Maintenance paths and accessibility determine the long-term operating costs of the system.
03
Project logic

How structure and roof membrane are planned together

Graubünden grants tax breaks for PV construction – the entire costs are deductible as energy-saving investment. The deduction can be spread over several tax periods, which is particularly advantageous for larger alpine systems. Roof inspection assessing statics, roof skin and existing installations.

Project logic

  • Roof inspection assessing statics, roof skin and existing installations.
  • Mounting geometry aligned with wind zone, tilt angle and usage concept.
  • Protection concept for roof skin, walkways and future maintenance access.

Cantonal framework

Which cantonal framework shapes the project in Graubünden.

The technical service stays the same, but the project frame changes with the canton. That is exactly where incentives, tax treatment and MuKEn requirements become strategically relevant.

Local context

Graubünden sets the economic pace for this service.

Thanks to altitude and cold, PV systems in Graubünden often deliver 30–50% higher yields than in the midlands. Projects like the alpine solar system on the Muttsee dam wall (Glarus/Graubünden) demonstrate the enormous winter electricity potential of the Alps.

In Canton Graubünden, flat roofs on commercial buildings and multi-family homes represent the largest untapped solar area. Graubünden considers the specific conditions of high altitude in its energy law. New buildings have self-generation requirements, taking into account the extreme climatic conditions in mountain municipalities.

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Tax and subsidy logic

Graubünden grants tax breaks for PV construction – the entire costs are deductible as energy-saving investment. The deduction can be spread over several tax periods, which is particularly advantageous for larger alpine systems. CHF 600/kWp facade subsidy (doubled in Green Deal). Highest facade subsidy in Switzerland! Solarexpress: accelerated permit procedure for large systems since 2022. Repower: min. 6 Rp./kWh + HKN bonus (0.5 Rp. winter, 0.2 Rp. summer).

Permits and energy law

Solarexpress: accelerated permit procedure for large systems since 2022. Three projects in Surselva area approved 2024 (Nalpsolar, Scharinas, others). Alpine special rules for 2,000m+ systems. Tourism hotspots (Davos, St. Moritz): special procedure. Graubünden considers the specific conditions of high altitude in its energy law. New buildings have self-generation requirements, taking into account the extreme climatic conditions in mountain municipalities.

Market signal and location

Graubünden: pioneer of high-alpine solar systems. Nalpsolar (10 MW, 13 GWh/year at 2,000m), Scharinas (18.3 MW, 29 GWh/year, 13 GWh winter!). CHF 600/kWp facade subsidy = highest in Switzerland. Davos & St. Moritz: premium clientele + alpine peak conditions. Alpine solar systems above 1,200 m receive partial special subsidies. Besides the Pronovo one-time payment, the Canton of Graubünden offers contributions through the Building Programme. Large projects like alpine solar parks benefit from simplified federal approval procedures.

Facade subsidy

CHF 600/kWp Höchste der Schweiz (Green Deal)

Further reading

Which pages genuinely help from here.

Whether you want to go deeper into the service, explore the location context or compare projects in nearby regions – these pages will take you further.

Service

Core flat-roof PV page

The core service page explains mounting, roof protection and project logic for flat roofs.

Location

Canton Graubünden location page

The location page strengthens the geographic relevance for Canton Graubünden.

Service

PV installation

For general mounting questions, the PV installation page is the right entry point.

Hub

Location overview

The overview connects this canton with other relevant regions.

Nearby regions

The same service in other regions

Vigorek delivers this service in neighbouring cantons and municipalities too. Depending on location, subsidies and conditions can vary – a comparison is worthwhile.

Primary

Flat-Roof Photovoltaics St. Gallen – Loads, Roof Protection and Mounting

Canton St. Gallen: St. Gallen is a center for energy research – OST (Eastern Switzerland University of Applied Sciences) and the SPF Institute for Solar Technology in Rapperswil are among the leading solar research institutions in Switzerland. Here owners can find the services that matter most for planning, installation and commissioning in this region.

Secondary

Flat-Roof Photovoltaics Glarus – Loads, Roof Protection and Mounting

Canton Glarus: As a mountain canton, Glarus relies on the combination of hydropower and solar for year-round renewable electricity supply. South-facing slopes in Glarus deliver up to 15% higher PV yields than lowland locations. Here owners can find the services that matter most for planning, installation and commissioning in this region.

Secondary

Flat-Roof Photovoltaics Uri – Loads, Roof Protection and Mounting

Canton Uri: The Uri valley floor benefits from a Foehn-favoured climate with above-average sunshine hours. At altitudes above 1,000 m, PV yields increase by up to 20% compared to the midlands thanks to cold and reflection. Here owners can find the services that matter most for planning, installation and commissioning in this region.