This article focuses on defects that occur during the plastering process. It also discusses the workability of plaster, Efflorescence, proper proportioning, and curing. These defects can affect the quality of a building’s finish. To avoid such defects, it is important to follow certain best practices. Get the best plastering information here.
Workability of plaster
Plaster as a building finish has several defects that can lead to the failure of the structure. These defects include differential shrinkage, uneven cement concentrations, and over-trowelling. Over-trowelling leads to the cement matrix to rise above the surface, causing a crack to form. This type of crack is a sign of sulphate attack and can damage the surface rendering as well as the mortar joints. In advanced stages, the cracked plaster may detach completely.
Efflorescence on plaster
Efflorescence is a white or grey crystalline deposit that appears on the surface of building finishes such as plaster. It occurs as a result of soluble salts that are present in building materials. These salts are attracted to the surface through pores and absorb moisture from the air. Eventually, this salt deposits will disfigure the surface of a building, weakening its structure. Efflorescence can be prevented by maintaining proper curing and drainage.
Proper proportioning of materials
Proper proportioning of materials in plastering is a vital aspect of plastering as a building finish. Incorrect proportioning of materials can lead to problems with a building finish, such as poor adhesion, a crumbling surface, or an uneven basecoat. Plaster thickness is also important, as too thick or too thin a layer can result in delamination or debonding. Excessive thickness can also lead to cracks and delamination, due to shrinkage caused by the loss of moisture. To avoid these problems, a two-layer plaster application with a three-day gap between layers is advisable. Similarly, improper proportioning of materials in plastering can result in a weak plaster that will be difficult or impossible to repair.
Proper curing of plaster
The process of applying plaster to a building requires careful consideration. There are several factors that can affect the quality of the final result. Among these are uneven thickness and uneven cracks. These problems are often the result of improper substrate preparation. The process should begin with the proper cleaning of the surface to be plastered. Next, a cement slurry should be applied to ensure proper adhesion. The plaster must also have adequate moisture content. Bonding liquids should be applied according to the manufacturer’s instructions.
Grinning on gypsum plaster
Grinning on gypsum plaster is the condition of a plastered wall where the mortar joints are visible through the plaster. This phenomenon is caused by the difference in suction between the masonry units and the mortar. Grinning can be remedied by removing the old plaster and applying an undercoat or spatterdash coat. This condition is usually temporary and does not lead to further cracking.
Proper curing of gypsum plaster
Gypsum plaster is a lightweight and versatile interior finishing material. It gives a smooth surface that is perfect for applying good-quality wallpapers and paints. It also has excellent bonding properties and can be applied with minimal effort. Moreover, it can be applied on rough or smooth surfaces. It is available in easy-to-handle packs that make application easier and faster.
Problems with gypsum plaster
Gypsum plaster is a building finish that can be used on interior and exterior walls. It is usually white in color and comes in powder form. It is heated to varying temperatures to create a variety of plaster textures. It is less expensive than cement plaster and is suitable for use in interior plastering. It can be reused after use and is more durable.