Green Roof cadastre FAQ

The costs of a green roof vary greatly depending on the systems used. Against this background, only a rough cost estimate is given in the green roof cadastre. The stated costs are based on literature research.

The green roof cadastre is essentially based on an aircraft-based point cloud and the official building floor plans.

Since the official building floor plans (ALKIS buildings) are used to identify buildings in the point cloud, we unfortunately cannot take roof overhangs into account.

Yes, the combination of solar collectors and photovoltaic modules with a green roof is now easily possible with the appropriate mounting systems.

In order for the solar system to harmonize with the green roof, it must be ensured that the plants do not shade the solar modules. Conversely, the solar system must not impair plant growth too much. Ideally, the solar modules are therefore placed at a distance from the vegetation by means of a raised frame.

Green roofs even have a great advantage in combination with photovoltaic systems: As soon as the ambient temperature rises too much, the semiconductors in photovoltaic modules suffer from performance losses. Due to evaporation effects on green roofs, the temperature here rarely rises above 25 °C. Compared to gravel roofs with a temperature of 40 °C, this results in a significant cooling effect, which leads to improved performance of your photovoltaic system.

Of course, when combining solar energy and green roofs, it should be noted that the solar system means an additional load that must be taken into account in the static test.