What are the three types of plaster?

In Auckland, there are several types of plaster commonly used in construction. Here are three primary types of plaster, along with their characteristics, applications, and a brief explanation of the science behind each:

  1. Gypsum Plaster:

– The Science: Gypsum plaster, also known as plaster of Paris, is made from the mineral gypsum (calcium sulfate dihydrate). It is produced by heating gypsum at high temperatures to remove the water content, resulting in a dry powder that can be mixed with water to form a workable paste.

– Application: Gypsum plaster is primarily used for interior applications. It is commonly used for skimming over walls and ceilings, creating a smooth and even surface. Gypsum plaster is easy to work with, provides good adhesion, and offers fire resistance properties. It is commonly used in residential and commercial buildings, including homes, offices, and retail spaces.

  1. Cement Plaster:

– The Science: Cement plaster, also known as stucco or render, is made by combining cement, sand, water, and sometimes additional additives. The mixture forms a paste that can be applied to various surfaces.

– Application: Cement plaster is used for both interior and exterior applications. It is commonly applied to walls, facades, and other surfaces to provide a durable, weather-resistant, and visually appealing finish. Cement plaster offers excellent strength, durability, and resistance to weathering, making it suitable for a wide range of building types.

  1. Lime Plaster:

– The Science: Lime plaster is made by mixing lime (calcium hydroxide) with sand and water. It can be produced from both hydraulic lime and non-hydraulic lime, with hydraulic lime having the ability to set and harden underwater.

– Application: Lime plaster is used for both interior and exterior applications. It is often chosen for its breathable and flexible properties, allowing moisture to evaporate from the walls. Lime plaster is suitable for historic or heritage buildings, as it can mimic the traditional plastering methods used in older structures.

These are the primary types of plaster commonly used in Auckland, but it’s important to note that there may be additional variations or specialized plasters used for specific purposes or in specific industries. It’s always best to consult with professional plasterers or construction experts for specific advice and guidance based on your project’s requirements.