What Type Of Plaster Should Be Used For Wall Plastering?

Wall plastering is a key component of any construction or renovation project.

Whether you’re building a new home or renovating an old one, choosing the right plaster can significantly impact the durability and appearance of your walls.

In Australia, where climates can vary widely, selecting the appropriate plaster for different conditions becomes even more critical.

This guide will walk you through the various types of plaster available and help you make an informed decision based on your needs.

Let’s get straight to the point

When choosing plaster for wall plastering, consider factors like climate, aesthetics, budget, and durability.

In Australia, cement plaster is cost-effective and durable, ideal for high-traffic areas but prone to cracking. Gypsum plaster offers a smooth, quick-setting finish but is vulnerable to moisture.

Clay plaster is eco-friendly and moisture-regulating but harder to apply and unsuitable for wet areas.

Lime plaster is breathable, flexible, and good for humid conditions but is more expensive and slow-drying.

Choose based on your location, design goals, and budget to ensure long-lasting, appealing walls.

An Overview of Plaster Varieties for Wall Plastering

Before diving into the specifics of each type of plaster, it’s essential to understand the variety of options available for wall plastering.

Whether you’re seeking a cost-effective solution, superior durability, or eco-friendly options, there is a plaster type to suit every requirement.

Factors to Consider When Choosing a Plaster

• Climate: Different plasters respond better to various humidity and temperature conditions.
• Aesthetic Needs: The finish of the plaster can significantly affect the appearance of your walls.
• Budget: Some plasters are more affordable, while others may cost more due to their specific properties or installation requirements.

Let’s explore the most common types of plaster used for wall plastering in Australia.

Cement Plaster: A Versatile and Durable Option

Cement plaster, often referred to as sand-cement plaster, is one of the most popular choices for wall plastering.

It is created by mixing sand, cement, and water, and it’s often used in both interior and exterior applications.

Advantages of Cement Plaster

1. Cost-Effective: Cement plaster is among the most affordable options for wall finishes, making it a go-to for builders on a budget.
2. Durability and Strength: Cement plaster is highly durable, making it perfect for areas with heavy foot traffic. It’s resistant to cracks and abrasion, which ensures long-term stability.
3. Water and Fire Resistance: Cement plaster’s resistance to water and fire makes it ideal for use in high-risk areas like kitchens and bathrooms.
4. Versatility: This plaster can be used on various surfaces, making it a highly versatile option for interior and exterior walls.
5. Easy to Apply: Cement plaster can be applied either in thin or thick layers, depending on the desired finish.

Disadvantages of Cement Plaster

1. Prone to Cracking: If not applied correctly, cement plaster can crack over time.
2. Slow Drying Time: Cement plaster can take several days to fully dry, which may delay construction schedules.
3. Health Concerns: Working with cement plaster can pose health risks, including skin and respiratory irritation, so wearing protective gear is essential.
4. Difficult to Repair: Once damaged, cement plaster can be challenging and costly to repair.
5. Limited Design Options: Cement plaster has fewer aesthetic possibilities compared to other plasters like gypsum or lime.

Gypsum Plaster: The Smooth, Fast-Setting Choice

Gypsum plaster is made from gypsum, a naturally occurring mineral. This plaster is preferred for its smooth finish and quick setting time, making it ideal for interior walls.

Types of Gypsum Plaster

• Natural Gypsum: Contains fewer additives and is typically used in areas where a natural finish is desired.
• Synthetic Gypsum: Often contains up to 80% fillers, making it more cost-effective.
• Modified Gypsum: This may include additional ingredients to improve durability and resistance to moisture.

Advantages of Gypsum Plaster

1. No Shrinkage Cracks: Unlike cement plaster, gypsum does not crack due to shrinkage.
2. Quick Setting Time: Gypsum plaster sets within 25-30 minutes and can be painted after just 72 hours.
3. Environmentally Friendly: Since it’s a natural material, gypsum plaster has a lower environmental impact compared to cement.
4. Smooth Finish: Gypsum creates a sleek, professional finish, perfect for interior walls.

Disadvantages of Gypsum Plaster

1. Vulnerability to Moisture: Gypsum plaster is not suitable for wet areas like bathrooms or kitchens.
2. Higher Cost: Compared to cement plaster, gypsum is often more expensive.
3. Lower Strength: It’s not as durable as cement, making it more prone to damage from impacts.
4. Chemical Sensitivity: Cleaning agents can damage gypsum plaster, so specialised cleaners must be used.

Clay Plaster: A Natural and Eco-Friendly Option

Clay plaster is experiencing a resurgence in popularity due to its natural and eco-friendly properties.

Made from natural clay, aggregates, and fibres, clay plaster creates a unique, natural appearance.

Advantages of Clay Plaster

1. Eco-Friendly: Composed of natural, non-toxic materials, clay plaster is sustainable and can be reused or recycled.
2. Good Insulation: Clay plaster is an excellent insulator, helping to regulate indoor temperatures and reduce energy consumption.
3. Moisture-Regulating: Clay plaster can absorb and release moisture, making it ideal for maintaining a balanced indoor humidity.
4. Easy to Repair: Damaged clay plaster can easily be repaired with just water and a trowel.

Disadvantages of Clay Plaster

1. Vulnerable to Water Damage: Clay plaster is not suitable for areas exposed to water, such as near sinks or in bathrooms.
2. Longer Drying Time: This type of plaster takes longer to dry than cement or gypsum, potentially delaying project completion.
3. Skilled Labour Required: Applying clay plaster correctly requires a professional with specialised skills.

Lime Plaster: Breathability and Flexibility

Lime plaster is an ancient technique that is still widely used in Australia today.

It’s made by mixing lime, sand, and water and is known for its breathability and flexibility.

Advantages of Lime Plaster

1. Breathable: Lime plaster allows moisture to escape, which can help prevent dampness and mould in buildings.
2. Flexible: Lime plaster can adapt to small movements in a building, reducing the risk of cracking.
3. Aesthetic Appeal: Lime plaster has a natural, earthy look that can add charm to older or more rustic-style homes.
4. Environmentally Friendly: Like clay, lime plaster is a natural material with a low environmental impact.

Disadvantages of Lime Plaster

1. Longer Drying Time: Lime plaster takes longer to dry than other types, which can slow down construction.
2. Higher Cost: Due to its natural materials and the skill required for application, lime plaster is typically more expensive.
3. Limited Availability: Lime plaster may not be as readily available in some areas, which could make it harder to source for your project.

Key Factors to Consider When Choosing Plaster for Wall Plastering

When deciding on the type of plaster to use for your walls, it’s essential to weigh several factors. Below are the key considerations:

Climate and Location

Climate plays a significant role in the type of plaster you choose. For instance, gypsum plaster works well in dry areas but is unsuitable for humid or wet environments.

On the other hand, lime plaster is ideal for humid conditions due to its breathable nature.

Aesthetic Preferences

If you’re looking for a smooth and polished finish, gypsum plaster might be the best option. If you prefer a more rustic, natural look, clay or lime plaster may better suit your needs.

Budget Constraints

For homeowners on a tight budget, cement plaster is often the most cost-effective option.

However, if you have a larger budget and want a more luxurious finish, gypsum or lime plaster may be worth the investment.

Maintenance and Durability

If durability is your primary concern, cement plaster is the most robust choice.

However, for interiors where aesthetics and ease of maintenance are more critical, gypsum plaster might be more appropriate.

Skilled Labour Requirements

Some types of plaster, such as lime and clay, require skilled tradespeople to apply correctly.

Ensure you hire an experienced professional to avoid issues like cracking or uneven finishes.

Conclusion

Choosing the right type of plaster for your wall plastering needs is crucial to ensuring both durability and aesthetic appeal.

Cement plaster offers strength and versatility, while gypsum plaster provides a smooth, quick-setting option for interior walls.

If you’re environmentally conscious, clay and lime plasters offer eco-friendly alternatives with unique textures and finishes.

By considering your budget, climate, and design preferences, you can make the right decision for your Australian home, ensuring it stands the test of time.

Frequently Asked Questions

Can I Use Any Plaster For Wall Plastering?

No, you cannot use any plaster for wall plastering. The type of plaster you should use will depend on the surface you are plastering and the desired finish. 

For example, you may use a different type of plaster for interior walls than exterior walls and a different type for smooth finishes than textured ones.

It’s best to consult with a professional or a home improvement store to determine the right type of plaster for your specific needs.

What Is The Most Commonly Used Plaster For Wall Plastering?

The most commonly used plaster for wall plastering is gypsum plaster, also known as plaster of Paris.

It is a smooth, white powder that can be mixed with water to create a paste that is easy to apply and dries quickly.

Gypsum plaster is popular because it provides a smooth finish and can be easily sanded and painted. It is also fire-resistant and has good insulation properties.

How Long Does Plaster Take To Dry?

The time it takes for the plaster to dry will depend on several factors, such as the type of plaster used, the thickness of the layer applied, and the temperature and humidity of the environment.

However, plaster can generally take a few hours to several days to dry completely. Therefore, allowing the plaster to dry completely before sanding or painting is important to avoid damage or cracking.

Is It Necessary To Hire A Professional For Wall Plastering?

Hiring a professional for wall plastering is unnecessary, but it can be beneficial. Plastering requires a certain level of skill and experience to achieve a smooth and even finish, especially for larger areas or more complex surfaces.

If you need more experience or clarification about the process, hiring a professional can ensure a high-quality result and save time and effort.

However, if you have experience with DIY projects and are comfortable with the process, you can attempt wall plastering with proper research and preparation.

How Many Layers Of Plastering Are On A Wall?

To seal the wall’s surface perfectly, wood and metal require three coats of plastering. Stone and brick masonry generally require two coats for important constructions (public buildings, schools, etc.) and a single coat is done for low-cost construction.