Green cities: green roofs and façades in urban areas

In recent years, interest in sustainable and environmentally friendly solutions in cities has increased worldwide. One particularly effective method that not only beautifies the cityscape but also offers numerous ecological and economic benefits is green roofs and façades. In this blog article, we would like to highlight the various aspects of this innovative practice and explain why it is so important for the future of our cities.

Advantages of green roofs

1. climate regulation:

Green roofs act like natural air conditioning systems. They insulate buildings, reduce energy consumption for heating and cooling and thus help to reduce CO2 emissions. In summer, they have a cooling effect by absorbing the sun's rays and lowering the ambient temperature.

2. improvement of air quality:

Plants filter pollutants from the air and produce oxygen. Green roofs can therefore contribute significantly to improving air quality in cities, which is particularly important in densely populated areas.

3. biodiversity:

Green roofs create valuable habitats for plants and animals. They promote biodiversity by providing niches for various species that have become rare in urban environments.

Advantages of façade greening

1. aesthetics and quality of life:

Green façades beautify the cityscape and increase the well-being of residents. Studies have shown that green spaces reduce stress and promote general well-being.

2. noise protection:

Plants on building façades can act as natural sound absorbers and help to reduce noise levels in cities. This significantly improves the quality of life for residents.

3. protection of the building fabric:

Green façades protect buildings from extreme weather conditions and UV radiation. This extends the service life of building structures and reduces maintenance costs.

Costs of roof and façade greening

The costs for green roofs or façades can vary greatly depending on the scope of the project, the type of greening and the specific circumstances. Here are some general guidelines to give you an idea of the possible costs:

Roof greening

1. extensive greening:

Costs per square meter: approx. 30 to 50 euros Description: This type of greening is relatively light and only requires a thin layer of substrate. It is suitable for plants such as mosses, herbs and sedum. Extensive greenery is low-maintenance and requires little watering.

2. intensive greening:

Cost per square meter: approx. 100 to 200 euros Description: This variant is more like a garden and can include lawns, perennials, shrubs and even small trees. It requires a deeper layer of substrate, is heavier and requires more maintenance and watering.

Facade greening

1. simple trellis:

Costs per square meter: approx. 50 to 150 euros Description: Climbing plants are pulled up on climbing aids on the façade. This method is relatively inexpensive and easy to install.

2. modular façade system:

Cost per square meter: approx. 300 to 800 euros Description: These systems consist of prefabricated modules or panels that are attached directly to the façade. They contain substrate and plants and are often equipped with irrigation and nutrient supply systems.

Other cost factors for roof and façade greening

1. statics and preparation:

The structural requirements must be checked, especially for green roofs. Reinforcement measures may be necessary, which can result in additional costs.

2. planning and approvals:

Planning by a specialist and any necessary approvals can result in additional costs.

3. care and maintenance:

Regular care and maintenance are important to keep the greenery in good condition. Annual costs should be factored in for this.

Successful examples of greening cities from around the world

Singapore: The city has become a pioneer in green roofs and façades. With impressive projects such as the "Supertree Grove" in Gardens by the Bay, Singapore shows how urban greenery can be successfully integrated. Berlin: The German capital is known for its many green roofs and façades. Projects such as "Beusselstraße" in Moabit show how old buildings can be modernized and ecologically upgraded through greening. New York: The High Line, a disused railroad corridor that has been transformed into a public park, is an excellent example of urban greening. It offers a green retreat in the middle of the bustling city.

Make the city greener too!

Green roofs and façades are far more than just a trend. They are a sustainable solution that makes our cities more liveable, more ecological and more sustainable. In view of climate change and increasing urbanization, it is more important than ever to integrate green oases into our cities. Through innovative greening projects, we can not only beautify the cityscape, but also actively contribute to environmental protection. Invest in green roofs and façades and make your city a greener and healthier place to live! You can find more information about roofs and façades in our coverage of DACH+HOLZ 2024