What kinds of additives are used in solid plaster and why?

In Auckland, various additives can be incorporated into solid plaster to enhance certain properties or address specific requirements. Here are some examples of additives used in solid plaster and their purposes:

  1. Water Repellents: Water repellents, such as hydrophobic admixtures, are added to the plaster mix to improve the water resistance of the finished surface. These additives help prevent moisture penetration into the plaster, reducing the risk of water damage, efflorescence, and mold growth. Water repellents are commonly used in exterior solid plaster applications to protect against rain and dampness.
  1. Plasticizers: Plasticizers, also known as water reducers, are additives that improve the workability and flow of the plaster mix. They enhance the spreadability and ease of application, allowing the plaster to be troweled or floated more effectively. Plasticizers also improve the cohesion and reduce the risk of cracking in the plaster. They are often used in solid plastering to achieve a smoother and more workable consistency.
  1. Accelerators: Accelerators are additives used to speed up the curing and hardening process of the plaster. They are particularly useful in colder weather conditions or when a faster turnaround time is required. Accelerators promote the early strength development of the plaster, allowing it to reach its desired properties more quickly. These additives can be beneficial for solid plastering projects where a shorter construction timeline is desired.
  1. Pigments: Pigments are added to the plaster mix to introduce color into the finished surface. They can be used to achieve a specific aesthetic or match the desired appearance of the surrounding environment. Pigments are commonly employed in solid plastering projects where a colored or decorative finish is desired, such as for architectural accents or artistic detailing.

It’s important to note that the specific additives used in solid plastering may vary depending on the project requirements, chosen plastering system, and the preferences of the plastering professionals. The selection and application of additives should be done in accordance with the manufacturer’s recommendations and industry best practices.

When considering the use of additives in solid plastering, it is advisable to consult with our local plastering professionals at Your Plasterers Auckland who can provide guidance on the appropriate additives for specific applications and desired outcomes.