For flat roofs, a distinction is usually made between the unventilated flat roof, the so-called warm roof, and the ventilated version, the cold roof. This consists of an upper shell, which serves as protection against precipitation, a lower shell, which provides for the thermal insulation and the intermediate roof space.
A cold roof is always well ventilated
Cold roof is the name given to a flat roof in double-shell, ventilated form. It was born of the idea of making a steep roof so shallow that it creates a ventilation space. However, this construction could not prevail because of problems caused by cross ventilation problems. In the meantime common is the unventilated flat roof, the warm roof.
A ventilated flat roof usually consists of the following structure
- separating layer
- wooden shuttering as underlay
- ventilation level
- thermal insulation
- vapor barrier
- roof support structure
the different structural layers
the lower layer of the ventilated flat roof is provided with a vapor barrier, on top of which becomes the insulating layer applied. On the spacer construction, the upper cover lies on, it allows the actual ventilation. The ventilation slots or roof ventilation on the roof edges ensure optimal ventilation of the flat roof.
Suppliers make a non-binding offer on request.
The price for a ventilated flat roof can not be described as a flat rate because it requires different layers. The specialist companies prepare a non-binding offer, this requires different information. In any case, always ensure adequate supply of the roof space, various providers have system fans in the offer. These are priced between 80, - and 100, - Euro. O- wego-systembaustoffe.de has system fans for cold roofs in its range.
- dachbaustoffe.de also offers a system fan.
- kloeber.de provides the complete flat roof program, also for ventilated flat roofs.
- Tips & TricksIn the case of a double-shell ventilated flat roof, a vapor barrier must always be installed under the thermal insulation. In addition, care must be taken to ensure adequate supply and exhaust air openings and obstacle-free airspace.