Roughcast is a type of plaster made of lime and cement with inclusions such as sand, gravel, and shell fragments. It creates a textured, pebbly surface and is mainly used for external surfaces of country houses. Pebble, a variant of roughcast, reduces property value and is unpopular.
Rough is a type of plaster that has many inclusions, including sand, gravel, pebbles, and shell fragments, but the main components of plaster are lime and cement. This type of plaster has a rough, pebbly appearance, which gives it the alternative name of pebble, but is applied flat to a surface. Roughcast is mainly used on external surfaces as a decorative element for country houses, and can come in different colors, based on the inclusions. An unpopular form of this plaster is called pebble, which is achieved by throwing small stones and gravel at wet plaster as it is drying, a move that commonly reduces the home’s property value.
When a home or structure is being built, the owners or builders often use a decorative element to make the structure unique. Roughcast is a plastering technique that starts with a medium plaster based on lime and sometimes cement. The difference between pebble and regular plaster is the inclusion of small materials, such as pebbles and gravel. By adding these tiny shards to the mix, Pebbledash creates a textured, pebbly surface that is textured both visually and tactilely.
Some roughcast mixes will come pre-made with inclusions, while others start out as plaster and have the inclusions added before they’re applied to the surface. After being mixed to create a slurry, the pebble is placed on a surface. While the pebble is coarse, it needs to be flat and evenly distributed, with no lumps, or else the effect will look sloppy.
In the 1910s, stock was a common design element seen on many homes. It has since declined in popularity, but can still be seen on many homes. The most common homes to sport this type of finish are country homes, as this adds a casual, natural effect to the structure. Most commonly seen outdoors, roughcast can also be used indoors, but this application is rare.
Depending on what the inclusions are, roughcast can have different color effects. If blue inclusions are added, for example, the whole effect will have a blue tint. An arrangement of differently colored inclusions can cause the colors to merge. Glass can also be added to the slurry, but this is rarely done.
While roughcast is generally seen as a nice effect, a variant is largely unpopular and can reduce property values by around 5%. This is called a pebble. With this technique, inclusions are added to the wall after the plaster has been placed on the surface, creating an uneven spread. Inclusions are also likely to fall out of the plaster after a few months or years, making the look even less appealing.
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