Hinterlüftet

Hinterlüftet, in English often translated as a ventilated or rain-screen facade, describes a building facade system in which an outer cladding is separated from the structural wall by an air gap. The ventilated cavity allows air to flow behind the cladding, facilitating moisture removal and heat exchange.

In practice, a hinterlüftet facade consists of an outer cladding layer (such as metal panels, ceramic tiles, timber, stone or composite materials), a drainage and ventilation gap, and a supporting substructure attached to the building envelope. The interior side typically includes insulation and a vapour barrier. The top and bottom of the cavity are opened to promote continuous air movement, which helps to dry any water that penetrates the cladding and reduces the risk of condensation and mold within the wall construction.

The main advantages are improved moisture management, enhanced durability of the facade, and potential improvements in thermal performance when combined with suitable insulation. The system can also reduce staining and weathering of the outer layer and offers design flexibility due to the wide range of cladding options. However, hinterlüftete Fassaden require careful detailing: the width and continuity of the air gap, proper drainage, wind-driven rain considerations, and maintenance of vents and joints are essential to prevent blockages and ensure effective operation.

Regional use is widespread in Europe, particularly in Germany, Switzerland, and Austria, where the concept is well established in both new buildings and renovations. It is important to distinguish hinterlüftete facades from solid, non-ventilated wall claddings, as performance and maintenance requirements differ significantly.