Hydromedia RoofTop Duo

Gallery Hydromedia RoofTop Duo  1
Gallery Hydromedia RoofTop Duo  1
May 2021
By Holcim
Headquarters 6300 Zugo, Suíça

Hydromedia RoofTop Duo - A permeable concrete roof system with enhanced functionalities

The solution offers the possibility of turning inaccessible roofs into attractive, modern and safe areas for recreation and fun. This transformation is possible thanks to combining Hydromedia pervious concrete technology and Nidaroof water storage capacity membrane. Thanks to this solution, investors can save on construction costs due to the downsizing of the rainfall drainage system. The habitants gain durable and safe areas to socialize, meet and relax. Cities reduce risks of peak rainfall floods and reduce the urban heat island effect.

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Key features

  • Can be adopted to any type of flat roof and can store from 26 to 494 L of rainfall per m2
  • Can be dimensioned for pedestrian and car traffic
  • Minimum 30 years of performance and reduced cost of maintenance
  • GHG potential reduction up to 17%
  • Captures up to 70% of rainfall
  • Using concrete with 20% less CO2 footprint and water retention membranes made of 60% recycled materials


  • 4% cheaper than a standard solution per m2
  • At least €3400 saved on construction and €1000/year on regular maintenance
  • 30 years of performance and reduced cost of maintenance

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

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Spain, France,

  • Headquarters
  • Activity

Related Topics

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.