K2 GreenRoof 2.0: Green roofs and PV – one system

2026 . 10 . 07

European cities are heating up. Heat waves, heavy rain events, and rising building density require new urban planning solutions. Flat roofs are moving to center stage—from unused reserve space to active asset: energy generation, climate buffer, core element of modern city development. Combining both on one roof is no longer vision. It's proven practice.

The combination makes technical sense. Vegetated roofs stay significantly cooler than sealed surfaces in summer. This cooling directly boosts output: solar cells lose efficiency above 25 °C. According to SolarPower Europe, evaporative cooling from vegetation increases power generation by 2 to 8 percent annually - up to 20 percent at peak times. Heat transmission through the roof drops by 70 to 90 percent, protecting buildings from overheating. Green roofs also double or triple roof membrane lifespan per the European Federation of Green Roof Associations, improve rainwater management, and capture airborne particulates. Bottom line: vegetation protects the roof, cooling increases module output, cities benefit too.

Fewer parts. Faster installation. Same quality.

K2 GreenRoof 2.0 makes this combination planning and execution-ready. The optimized mounting system connects green roofs and photovoltaics into one working unit—with significantly less effort. Compared to previous solutions, component count drops noticeably. Pre-assembled supports cut installation time on site.

New construction or retrofit - the system adapts. Retrofit K2 GreenRoof 2.0 onto existing green roofs: direct mounting on concrete pavers, no additional PE sheet. This reduces field work. Need planning support? K2's expert team handles design and structural calculations.

Key advantages:

• Tilt angles: 10° and 15°
• Module orientation: portrait and landscape
• Arrangement in A-, V-, or S-form with selectable row spacing
• Long-side clamping - proven positioning with high load transfer
• Generous module-to-roof distance - ideal growing conditions
• K2 building-block principle: core components from proven SingleRail and BasicRail systems and K2 GreenRoof Vento - familiar architecture, no learning curve, immediate productivity.

A market taking shape

From 2027, the EU Building Directive mandates PV on new buildings across member states. Combined green roof-PV projects move from exception to standard and installers building experience now become tomorrow's first choice. K2 GreenRoof 2.0 is the answer already on the roof.

See Technical Data and a video about Green Roof 2.0