Today, we are increasingly confronted with extreme weather conditions, including short but intense rain showers. This puts significant pressure on the water management systems in urban areas. In many cases, the existing sewer infrastructure is not designed to handle such peak loads, resulting in waterlogging, flooding, and damage to buildings and infrastructure. Green roofs and water retention roofs offer effective and sustainable solutions to tackle these challenges.
Green roofs: more than just aesthetics
Green roofs, also known as vegetated roofs, primarily contribute to buffering rainwater. The vegetation layer, substrate, and underlying roof structure work together like a sponge, absorbing rainfall and gradually releasing it. As a result, the load on the drainage system is significantly reduced.
In addition to water management, green roofs offer several other benefits:
- Thermal insulation: They improve the building’s energy efficiency by reducing temperature fluctuations.
- Air purification: Vegetation helps filter fine dust particles and contributes to improved air quality.
- Biodiversity: Green roofs create new habitats for insects, birds, and other urban wildlife.
- Extended roof lifespan: The waterproofing layer beneath a green roof is protected from UV radiation and extreme temperatures, which prolongs its service life.
IKO offers a range of high-quality bituminous membranes specifically designed for use in green roofing systems:
- IKO roofgarden pantera: a root-resistant elastomeric membrane with excellent mechanical performance, ideal as a base layer under green roofs.
- IKO roofgarden: suited for extensive green roofs with a smart and efficient build-up.
- IKO carbon: a durable top layer suitable for use in green roofing systems.
Water retention roofs: controlled buffering on a larger scale
Water retention roofs take things a step further than traditional green roofs. They are designed to temporarily store rainwater on the roof and gradually release it into the sewer system. This is achieved through a specially designed retention structure, consisting of elements such as retention crates or buffer zones that hold water in place.
Key benefits of water retention roofs include:
- Peak flow reduction: By temporarily retaining rainwater, these roofs prevent sewer overflow during heavy rainfall events.
- Efficient use of space: Instead of occupying ground-level space, the roof surface becomes multifunctional.
- Increased climate resilience: Retention roofs actively contribute to sustainable water management and urban climate adaptation.
IKO offers a reliable solution for this application as well. IKO roofgarden pantera is an ideal waterproofing membrane for use in water retention roofs. This bituminous membrane is root-resistant, compartmentalizable, and features high puncture resistance.
Conclusion
Green roofs and water retention roofs are no longer a luxury — they are a vital part of climate adaptation strategies in modern cities. Not only do they provide practical water management benefits, but they also contribute to a greener, healthier, and more sustainable living environment.
At IKO, we strive to offer innovative roofing solutions that are both technically reliable and ecologically responsible. The bituminous membranes listed above form the foundation of these durable roofing systems, with a strong focus on quality, durability, and long-term performance.
Contact your IKO advisor for more information.