![]() ![]() Mixed form of both above methods with higher layer structure than extensive planting, but with less demanding planting than intensive. A distinction is made between extensive, intensive and semi-intensive Image © Tommy Kwak Moreover, from a roof pitch of ten degrees, it may be necessary to secure the green roof to prevent it from slipping. Green roofs can also cause considerable additional area loads and many roofs are therefore statically prohibited for this. In addition, the load-bearing capacity of the roof structure must be checked. Depending on the type of green roof, the ongoing maintenance costs may also be higher than for an ungreened roof. Consequently, the expense of waterproofing against penetrating humidity and ingrowing roots can double the cost of a green roof compared to a normal roof. However, the main disadvantage of a green roof is the higher initial cost compared to a normally covered roof. Favors the efficiency of solar cells on the roof due to temperature reduction.Extends the life of the roofing membrane by protecting it from UV radiation and extreme temperatures (one expects a more than twice as long lifetime here).Absorbs sound emissions, making for a quieter city.Improves the urban climate by filtering pollutants from the air and reducing ambient temperatures. ![]() Reduces peak runoff into the sewer system during heavy rain events through rainwater retention.In winter, on the other hand, the green roof provides an insulating layer against the cold. But the climate of the rooms located under green roofs also improves: In summer, the green roof cools through light absorption, light reflection and the evaporation of water. Even then, citizens appreciated the advantages of greenery on the roofs, especially the visual enhancement of the cityscape. The first green roofs mentioned in historical records are probably the “Hanging Gardens of Babylon”, which were built before the beginning of our era. Here you can read what you need to know about green roofs and how to install them. But not every roof is suitable for greening. Green roofs look good and provide a better climate inside and out.
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