hinterlüfteten

Hinterlüfteten describes a facade construction in which the outer cladding is installed in front of a ventilated air gap behind it. This air gap is open to the exterior at the top and bottom to allow continuous air exchange. The arrangement helps manage moisture and temperature within the building envelope, protecting the inner wall from penetrating moisture and condensation.

How it works: Wind and buoyancy drive air through the cavity, carrying away moisture from the cladding and any water that penetrates the outer layer. A drainage layer and a weather barrier behind the gap protect the substrate from moisture. The moving air also reduces heat buildup on the inner wall, contributing to a drier, more stable interior environment.

Components: outer cladding material (such as timber, metal, ceramic, or composite); a ventilated air cavity typically around 20 to 50 millimeters wide; a supporting substructure; a drainage or rain-screen layer; a moisture barrier or weather-resistant barrier behind the cavity; and appropriate sealing and ventilation provisions.

Benefits and limitations: advantages include enhanced moisture management, reduced risk of mold and substrate damage, and potential improvements in durability and comfort. Disadvantages comprise higher initial cost and more complex detailing to prevent blockage or debris accumulation in the gap; performance depends on climate, orientation, and maintenance.

Usage and terminology: The concept is widely used in European construction, especially in German-speaking regions, and is commonly marketed as a ventilated or rain-screen facade. It forms part of moisture management and energy-efficiency strategies for building envelopes. See also ventilated facade.