Rauputz: Guide

Different techniques used to apply roughcast create a variety of structures. Depending on the taste, the optics range from evenly speckled to rustic roughened. Choose your favorite among the surface effects.

Grit size and cleaning technique determine optics

Two main factors determine the visual impact that roughing develops on the surface. The plaster is a mixture of binders, lime, cement, gypsum, various excipients and possibly color pigments. For around fifty years, plasters made of synthetic resin have been used, which are chemically held like paints by plastic binders. The grain sizes of the ingredients for the roughing starts with the diameter from about 1.5 millimeters and rich for the coarsest mortar up to 15 millimeters. Finer grain sizes between 0.3 and 1.5 millimeters produce smooth plaster. The different grain sizes are combined with the respective brushing methods, which are divided into six plaster subgroups. The smaller the grain, the less pronounced a structure is on the surface of the roughcast.

Stripped, thrown, sprayed or scratched

The finest variant of the rough plaster are the trowels. The plaster mortar with grain sizes up to 2.5 millimeters is applied with the trowel on the wall and spread. Depending on the desired appearance, the plasterer or plasterer draws visible trowel strokes when distributing the roughcast. An even roughened surface is achieved with felted or smoothed plasters. This method of cleaning is primarily used when creating a flush and designed with a sponge board. The trowel plasters, which consist of grain sizes of six to twelve millimeters, are also applied with the trowel. After the roughcast has been thrown, further processing steps such as peeling, blurring or dabbing can change the surface structure. A relatively uniform structure is produced with rough plaster that is sprayed on. The low-viscosity mortar with grain sizes from 1.5 to a maximum of four millimeters sprouts in several Verputzgängen and is one of the most common exterior plasters in homes. The combination of smaller grains with one largest grain produces grated or pulled roughcast or the disc plaster. The grain sizes of the plaster mortar are between 1.5 and seven millimeters. The largest grain produced by processing with a wooden board grooves and grooves in the surface. The coarser surface structure with its ten to 15 millimeter grains has the scratch coat, which develops a rustic look.

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