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Green roofs: everything you need to know

Benefits of a green roof

  • Isolating function
  • Improves the living environment
  • Alleviates the sewage system
  • Longer lifespan of roofing

Green roofs can be used to increase biodiversity. Additionally, the roofs’ layers of vegetation offer extra protection from weather effects. Due to climate change and increasingly strong rainfall, green roofs have become even more popular. Extreme rainfall has become increasingly common, and this increasingly shows us that a part of the solution against flooding can be found on roofs. The plants and the substrate of green roofs retain rainwater. By slowing the release of rainwater or not even releasing it due to evaporation, the sewage system is alleviated. Green roofs isolate in winter as well as in summer, resulting in a reduction of energy costs.

Different types of green roofs

There are different types of green roofs, and we differentiate between extensive and intensive green roofs. Depending on the type, there will be requirements made to the roof construction, the surface, the planting, and the optional usage of the roof. The thickness of the soil is dictated by the planting, which in turn determines the weight on the green roof or its inclination. Naturally, the roof construction has to be able to bear the additional weight of a green roof. The weight of the roof can increase rapidly, especially if it has soaked up rainwater. The HERTALAN® roof systems are suitable for extensive as well as for intensive green roofs.

Afbeelding: Groendak5_header

Creating a green roof – the construction of a green roof

Green roofs generally consist of a vegetation blanket, substrate, filter layer, drainage layer, protective layer, and a roofing membrane. This vegetation blanket contains the plants that have been selected, and the substrate layer is the plants’ soil. The drainage layer drains excess water and can also create water reservoirs for water buffering. The filter fabric prevents parts of the substrate from going into the drainage layer. When choosing the type of roof covering, it is essential that the selected roof covering is waterproof and that it is resistant against the growth of roots.

Choose the roof covering most suited to your green roof

EPDM roofing is resistant against root growth and is ideal for green roof systems.
Its proven lifespan of more than 50 years exceeds the lifespan of the vegetation blanket.
It does not contain any plasticizers that can seep out of the material and is permanently flexible.

 

Discover our prefab EPDM membranes 

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