Lattenlagen

Lattenlagen are a traditional plaster base layer consisting of thin wooden laths fixed to a wall. They are used in many Central European building traditions, particularly in timber-frame and masonry constructions, to provide a stable, keyed surface for plaster or render.

Construction and materials: Laths are narrow wooden slats of softwood such as pine or spruce. They are arranged to form a framework, usually nailed or screwed to the underlying structure at regular intervals. The spaces between the laths create a rough surface and ventilation behind the plaster, allowing the binding coats to grip and minor movements of the wall to occur without excessive cracking.

Function and applications: The lattenlage acts as a mechanical key for lime or cement plaster, improving adhesion and distribution of weight across the wall. It also facilitates moisture diffusion and helps accommodate slight movements of the structure. Historically, lattenlagen were used on interior walls and, in some cases, as a base for exterior renders.

Historical context and modernization: Lattenlagen were common before the widespread use of gypsum boards and modern metal lath systems. In historic buildings they are often found behind lime-putz or clay renders. In contemporary construction, wooden lattenlagen have been largely supplanted by plasterboards, metal lath, or mesh systems, though they may still appear in restoration projects or in traditional crafts.

See also: Putzträger, Putzsystem, plastering techniques.