Wandputz

Wandputz is the term used for plaster applied to interior walls in German-speaking regions. It protects the underlying substrate, provides a level surface, and can contribute to room aesthetics and moisture regulation. Plaster is typically applied to masonry, concrete, or gypsum-based wallboards and may be used both for restoration and new construction.

Most wandputz systems are based on binders such as lime, cement, or gypsum, combined with aggregates like sand. Traditional Kalkputz uses lime as binder and is highly permeable, allowing moisture to diffuse. Cement- or lime-cement-based putzes (Zementputz or Kalkzementputz) offer greater strength and faster hardening. Modern variants may include synthetic resins (Kunstharzputz) for improved adhesion and crack resistance, or decorative finishes (Streichputz, Strukturputz) that create textures such as smooth, orange-peel, or sanded surfaces.

In common practice, plaster is applied in layers. A base coat (Unterputz) prepares the substrate, followed by leveling or finishing coats, and a final decorative coat (Feinputz or Streichputz). The choice of system depends on substrate, humidity, desired appearance, and whether the surface should be breathable. Lime-based putzes are favored in traditional or heritage work for their hygroscopic properties, while cement- or resin-modified plasters are common in modern interiors and exterior repair contexts.

Wandputz remains widely used for renovation, restoration, and new-build interior finishes, valued for durability, fire resistance, and the range of textures available without heavy wall panels.