A Comprehensive Guide to Keycoats, Wall Plaster, Floor Screeds, and Gypsum Plaster


In the world of construction and interior design, keycoats, wall plaster, floor screeds, and gypsum plaster play crucial roles in achieving durable and aesthetically pleasing surfaces. Each of these materials serves unique purposes, contributing to the structural integrity and visual appeal of buildings. In this article, we will delve into the characteristics, applications, and benefits of keycoats, wall plaster,  floor screeds, and gypsum plaster .

1. Understanding Keycoats

What are Keycoats?

Keycoats are a vital component of the construction process, primarily used to create an adhesive bond between a substrate and the subsequent layer of plaster or render. They are applied to the surface before the application of the final plaster layer.

Importance of Keycoats

The primary purpose of keycoats is to enhance the adhesion of the plaster or render to the background surface. Without a keycoat, the plaster layer may not adhere properly, leading to potential cracks and instability.

Types of Keycoats

Various types of keycoats are available in the market, including acrylic-based, polymer-modified, and cementitious keycoats. Each type offers distinct advantages based on the specific application and substrate material.

2. Unveiling Wall Plaster

Definition of Wall Plaster

Wall plaster, often simply referred to as plaster, is a versatile material used to coat interior and exterior walls. It is a blend of cement, sand, and water, providing a smooth and durable finish.

Applications of Wall Plaster

Wall plaster finds widespread use in both residential and commercial projects. It not only creates a visually appealing surface but also serves to protect the underlying structure from moisture and environmental damage.

Types of Wall Plaster

Gypsum plaster and cement plaster are two common types of wall plaster. Gypsum plaster, derived from the mineral gypsum, offers excellent fire resistance and is suitable for internal walls. On the other hand, cement plaster is ideal for external walls and provides enhanced durability.

3. The Role of Floor Screeds

What are Floor Screeds?

Floor screeds are thin, smooth layers of cementitious material applied over a concrete floor base. They serve as a level surface for the final flooring materials, such as tiles, carpets, or wooden flooring.

Importance of Floor Screeds

Floor screeds play a critical role in achieving a level and even surface, ensuring the successful installation of the final flooring materials. They also help to conceal underfloor heating systems and electrical installations.

Types of Floor Screeds

Common types of floor screeds include traditional sand-cement screeds and self-leveling screeds. Traditional screeds are manually applied and require skilled labor for an even finish, while self-leveling screeds offer greater ease of application and an automatic leveling effect.

4. Gypsum Plaster: A Distinctive Material

Understanding Gypsum Plaster

Gypsum plaster, also known as plaster of Paris, is a lightweight and easy-to-mix material derived from the mineral gypsum. It sets quickly by reabsorbing water and hardens into a strong, sound-resistant surface.

Advantages of Gypsum Plaster

Gypsum plaster is highly desirable for its exceptional fire resistance, making it ideal for internal walls and ceilings. It provides a smooth finish that requires minimal sanding and is easy to work with during application.

Applications of Gypsum Plaster

Apart from its use in interior walls and ceilings, gypsum plaster is also employed to create decorative moldings and sculptural elements due to its malleable nature when mixed with water.


In conclusion, keycoats, wall plaster, floor screeds, and gypsum plaster are indispensable materials in the construction and interior design industries. Each material contributes unique properties and benefits, catering to specific applications and project requirements. Understanding the characteristics and applications of these materials is essential for architects, builders, and homeowners to ensure the durability, stability, and visual appeal of their structures.

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