![]() In the process of scrapping, the surface skin of the mortar is removed to expose the aggregate and the texture obtained depends upon the grading aggregates used in the final coat. The scrapping is done after the setting of the final coat has taken place. In this plaster finish, the final layer is usually 6 to 12 mm thick of which about 3 mm is removed in the scrapping process. Various types of scrapped finishes can be obtained by using different types of tools in different manners. It is a plaster in which the final coat, after being leveled and allowed to stiffen for a few hours, is scrapped with a steel straight edge old saw blade or other such tools to remove the surface skin. In many homes to create a good blend of smooth and rough surfaces, a scrapped plaster finish is created. The pebbledash plaster finish is mostly used for covering exterior walls and providing an aesthetic appearance to the structure. ![]() This finish of plaster possesses all the advantages of the roughcast finish and is recommended in similar conditions. The pebbles may be tightly tapped into the mortar with a wooden float or with the flat of the trowel. The pebbles used for dashing should be well-washed and thrown wet onto the final coat. The mortar for the final coat is usually made by mixing cement and coarse sand in the mix proportion of 1:3 and is placed in about 1 mm thickness. It is a Plaster Finish in which small pebbles or crushed stones of suitable size (generally varying from 10 to 20 mm) are thrown onto a freshly applied final coat of mortar and left exposed.
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