The construction is highest in the middle and slopes down towards the gables. This is to improve the run-off of rainwater in the case of heavy rainfall, especially with multi-span greenhouses. In the middle, the re up to 6 m high. The ventilation at the ridge is 0.7 Due to the height and wide ventilation, good ventilation efficiency can be achieved. The roof sticks out at the sidewalls so that rainwater can flow off without problems.