Solution | Product



Cool roof systems

This membrane mitigates heat urban island effect and reduces summer discomfort thanks to advanced surface radiative properties.


SopraStar is a covering for flat roofs that limits the absorption of solar energy and which reduces both urban heat islands and summer discomfort in buildings . The surfaces of the building’s envelope (roofs and facades) can contribute to urban cooling.

Thanks to their radiative properties (solar reflectivity and thermal emissivity), Cool Roof systems do not absorb solar energy but reflect it. These systems allow the temperature of surfaces exposed to solar radiation to be reduced. Thanks to an SRI (Solar Reflectance Index) of 96, the SOPREMA Cool Roof membrane SopraStar allow a reduction of the impact of a building on urban warming of over 50%, whilst at the same time reducing the interior temperature of the building by 1 to 2°C (summer comfort).

Gallery SopraStar 2
Gallery SopraStar 3

Key features

  • Reduction of the impact of a building on urban warming of over 50%.
  • Reducing the interior temperature of the building by 1 to 2°C (summer comfort).
  • Reduction of smog and significant improvement of air quality.
  • Energy savings on Air Conditioning: 3 kWh/y/m² of cool roof.
  • 1.9 to 7.5 kg of CO2 mitigated / m² of roof.


  • Between 0.5 and 1 $/m²/y of savings due to energy savings.

Categories of Application


Company Profile


67100 Strasbourg, France


SDG's of Application

Logo SDG 6
Logo SDG 7
Logo SDG 9
Logo SDG 11
Logo SDG 12

Maturity Stage

  • Medium and large scale commercialization
  • Small scale commercialization
  • Initial market commercialization
  • Prototype testing in the real world
  • Prototype testing 1:1 in the lab

Looking For


Activity Region

  • Headquarters
  • Activity

The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances.