Climateways green roofs Natural building optimisation to improve the urban climate
With our green roofs, we can significantly reduce runoff by evaporating some of the temporarily stored water and absorbing a large part of it from the plant roots. The remaining water can be discharged into the sewer system with a delay. Our green roofs not only have advantages for the urban climate, but also reduce costs such as precipitation fees. Specifically, they can perform the following functions:
- Heat and cold insulation
- Sound insulation through sound absorption of vegetation
- Reduction of the ambient temperature with evaporative cooling
- Reducing flood risk
- Water supply to the roof plants through water storage and drainage retention
- Filtering and binding of air pollutants and particulate matter
- CO2 storage
- Noise reduction
- Protection of the roof structure
Intensive & extensive green roofs
When it comes to green roofs, a distinction is made between extensive and intensive green roofs. The difference here lies mainly in the substrate height and the choice of plants.
Construction in the case of our extensive green roofs:
In the case of our extensive greening, the aim is to achieve near-natural vegetation with only minor maintenance measures. For this, plants with high adaptability and regenerative capacity are used. his variant is often used for garage and flat roof roofs or for greening garbage can boxes, as it has a low weight.
Vegetation
1 of 6Substrate
Rootable layer with several components that provide sufficient supply to the vegetation.
2 of 6Geotextile
Prevents substrate from being slurried into the drainage layer and affects water permeability.
3 of 6Drainage element
Temporarily stores water and supplies the plants with water in the long term. Excess water is fed to the roof drains.
4 of 6Geotextile
Filters fines and stabilizes the structure.
5 of 6Separating and protective fleece
Protection of roof waterproofing
6 of 6Specifications
- Typical planting moss, sedum, grass, herbs
- Weight 60-150 kg/m2
- Construction height 6-15 cm
- Watering effort Small
- Water retention 50-70 %
Construction of our intensive green roofs:
The intensive greening has a higher substrate structure and is characterized by a high level of use and maintenance, which is why this form is often referred to as a roof garden. Typical plantings include shrubs, lawns, trees, water features and the like.
Vegetation
1 of 6Substrate
Rootable layer with several components that provide sufficient supply to the vegetation.
2 of 6Geotextile
Prevents substrate from being slurried into the drainage layer and affects water permeability.
3 of 6Drainage element
Temporarily stores water and supplies the plants with water in the long term. Excess water is fed to the roof drains.
4 of 6Geotextile
Filters fines and stabilizes the structure.
5 of 6Separating and protective fleece
Protection of roof waterproofing
6 of 6Specifications
- Typical planting lawns, perennials, trees, etc.
- Weight 200-500 kg/ m2
- Construction height From 15 cm
- Watering effort Medium
Planning and construction
Before construction, it is necessary to check the statics and long-term tightness of the roof. Installation with extensive green roofs is possible up to an inclination of 35°. Due to the low weight, extensive green roofs usually have a sufficient load reserve on the garages and roofs. Intensive green roofs can result in an additional weight of up to 500 kg/m², so that a detailed examination should be carried out.
Studies
It has been shown that only 42% of the sun’s rays were converted into heat in extensively green roofs, while twice the amount of heat is generated in conventional roofs (Pfoser et al. 2014). The reason for this is that evaporation creates more latent than sensible heat (palpable), so that noticeable cooling occurs. However, the actual cooling is related to water availability.
The vegetation structure and species composition influence the rainwater retention of green roofs. The larger the leaf area, the higher the interceptive capacity, the temporary water storage on the leaf surfaces (Nagase and Dunnett 2012). As a result, up to 75% of precipitation can be absorbed and released with a delay, depending on the type of greening and the season
