Streichputz

Streichputz, or brush plaster, is a decorative plaster finish in which a thin plaster layer is applied to a prepared substrate and then worked with a stiff, bristled brush or broom to create a brushed texture. The resulting surface shows directional streaks and a tactile, wave-like pattern depending on brush, pressure, and direction. It is commonly lime-based (lime-putz) or cement-lime, and modern variants may incorporate Portland cement, hydraulic lime, or synthetic binders.

Application is typically carried out in stages. A base coat, usually a sound, firm render, is applied and compacted; after reaching tack, a top coat is laid on at a thin thickness. The top coat is brushed while still soft, with strokes that can be straight, circular, cross-hatched, or random, producing linear or stippled textures. The substrate should be solid and moisture-controlled to prevent cracking. Proper curing and protection from rapid drying are important for durability.

Texture and color vary. Streichputz textures range from fine to coarse, with grain sizes around 0.5–2.0 mm. It can be left natural or colored with mineral pigments integrated into the plaster or painted afterwards. Lime-based mixes are typically breathable, and exterior applications depend on binder type, render thickness, and protective measures.

Uses and history: Traditionally used on interior and exterior walls in European architecture, including historic buildings, churches, and residential houses. It is valued for its tactile surface, visual depth, and compatibility with historic materials. Maintenance involves gentle cleaning and timely repairs of damaged areas; repairs typically use matching lime-based mortars to preserve a seamless texture.