Gypsum pre-mixed plasters have many advantages over traditional plastering materials because they have been designed and manufactured with a specific application in mind. During the manufacturing process, plasters are tested in laboratories to ensure they satisfy their intended use. The range of plaster produced today can be used on low and high suction backgrounds.
Unlike cement- and lime-based plastering mixes, gypsum plasters contain manufacturer's instructions that provide user guidelines for each product. This provides additional performance benefits when specifying products for a particular design within a building. There are several different types of plaster available.
Although gypsum plasters have advantages over traditional plaster mixes in terms of thermal values and heat resistance, gypsum undercoat plasters are not suited to older buildings which may contain areas that have been in contact with or affected by rising o penetrating damp. (This means the background might still contain some moisture.) Gypsum plasters have high absorption rates so this could result in problems if the dampness has not been treated and completely removed from the background. Gypsum plasters can become mouldy and eventually perish in persistently damp conditions.
Plastering manufacturers British Gypsum and Knauf have developed plasters that can be sprayed directly onto the background, saving time and labour by improving efficiency. However, spray machines can be impractical in residential properties due to the challenge of setting up the equipment in small tight spaces.
The City & Guilds Textbook: Plastering for Levels 1 and 2
Mike Gashe & Kevin Byrne
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