Best cement for plastering your house
Product10 Jan 2024
Cement stands as a pivotal resource in constructing your home, wielding significant influence over its durability and structural soundness. Hence, the careful selection of all raw materials, particularly cement, is paramount. The market offers a diverse range of cement types tailored to meet diverse building needs. These variants come with distinct attributes that can elevate construction quality and concurrently reduce costs. Here's why selecting the appropriate cement matters:
Strength and durability: Different types of cement offer varying levels of strength and durability. Opting for high-quality cement ensures that your plastered surfaces remain strong and resilient over time, withstanding structural stresses and environmental factors.
Adherence and bonding: The right cement facilitates excellent adherence to the underlying surface, ensuring the plaster stays intact without cracking or crumbling. Proper adhesion prevents issues like water seepage and enhances the longevity of the application.
Workability and finish: Cement type influences the workability of the plaster mix. Some cements are easier to work with, allowing for a smoother finish and better adherence to different surfaces. This can significantly impact the aesthetic appeal of your walls and ceilings.
Resistance to environmental factors: Certain types of cement offer better resistance to factors like moisture, humidity, and temperature changes. Choosing the appropriate cement for your region's climate helps prevent efflorescence (white salt deposits on the surface) or degradation due to weather exposure.
Cost and efficiency: While quality is paramount, selecting the right cement also means balancing cost and efficiency. Some specialised cements might be pricier but offer specific advantages like rapid setting or enhanced strength, which can be beneficial depending on your project needs.
Compatibility with additives: In certain cases, you might need to add admixtures or additives to the plaster mix. Ensuring compatibility between the cement type and these additives is essential to maintain the desired properties of the plaster.
Long-term maintenance: Using the right cement minimises the need for frequent repairs or maintenance. A well-done plaster job with suitable cement can reduce the likelihood of cracks, deterioration, or other issues that require extensive fixes in the future.
Different types of plastering techniques
Traditional plastering involves applying a base coat of plaster (often a mix of sand, cement, and lime) followed by a finishing coat. Skilled craftsmen typically perform this technique, applying the application manually using a hawk and trowel.
Skim coating involves applying a thin plaster or joint compound layer over a wall or ceiling to create a smooth surface. It's commonly used to repair or cover imperfections and is applied with a trowel or a wide knife.
Venetian plaster involves applying multiple layers of thin plaster mixed with marble dust. It creates a polished, marble-like finish with depth and texture. Skilled artisans use specialised techniques like troweling and burnishing.
Spray plastering involves using a spray gun to apply plaster mixtures onto walls or ceilings. It's faster than traditional methods and is often used for larger areas. It requires skill to ensure an even application.
Pebble dash involves throwing small pebbles or stone chips against a wet render (plaster mix) coat. The stones adhere to the surface, creating a textured finish often used for exterior walls.
Stucco is a durable exterior plastering technique made of cement, sand, lime, and water. It's applied in multiple coats and can be textured or smooth, providing weather resistance and aesthetic appeal.
Roughcast plastering, like pebble dash, involves adding aggregates like gravel or pebbles into the plaster mix. The textured finish is achieved by throwing the mixture onto the wall and then levelling it.
Factors to consider when choosing cement for plastering
Type of surface: consider the surface you're plastering—interior or exterior walls, ceilings, or specialised areas like bathrooms. Different characters might require different types of cement for better adhesion and durability.
Cement grade: cement comes in various grades denoting their strength. Consider the load-bearing capacity required for the specific area you're plastering. Higher rates offer more strength but might not always be necessary for all surfaces.
Climate and weather conditions: The local climate influences the choice of cement. For instance, selecting adhesives with appropriate weather-resistant properties is crucial to prevent cracks or deterioration in areas prone to extreme temperatures or moisture.
Workability and setting time: Some cements offer better workability, making them easier to apply and finish. Additionally, the setting time of the cement matters, especially for large projects or when time is a constraint.
Admixtures or additives: Consider if you need to add specific admixtures or additives for enhanced properties like water resistance, improved workability, or accelerated setting times. Ensure compatibility between the cement type and additives.
Specialised requirements: certain areas might need specialised cement, such as sulphate-resistant cement for surfaces exposed to sulphate attacks or waterproof cement for areas prone to water exposure.
Cost and budget: balancing quality with price is essential. Higher-grade or specialised types of cement might be more expensive. Evaluate the project's needs against the available budget.
Manufacturer reputation and quality: opt for cement from reputable manufacturers known for consistent quality. Quality control in cement production ensures reliability and performance.
Consultation with experts: if unsure, consulting with construction experts or engineers can provide valuable insights into the best cement type for your specific project requirements.
Local building codes and standards: ensure the chosen cement meets or exceeds the local building codes and standards to guarantee compliance and structural integrity.
Types of cement suitable for plastering
Ordinary Portland cement (OPC) is the most common type of cement used in general construction. It's suitable for plastering interior walls and ceilings. OPC comes in various grades, such as OPC-33, OPC-43, and OPC-53, denoting their compressive strength.
Portland pozzolana cement (PPC) is a blended cement that contains pozzolanic materials like fly ash, which enhance workability and durability. It's ideal for plastering interior and exterior surfaces and is known for its resistance to cracks and better cohesion.
White cement is used for specialised decorative purposes or when a lighter finish is desired. It's more expensive than grey cement and is often used for creating coloured or textured plaster finishes.
Rapid hardening cement is engineered to gain strength rapidly, often within a few days. It's suitable for areas that need quick repairs or where faster completion is necessary, but it might be less widely used for general plastering.
Sulphate-resistant cement is used for surfaces that might be exposed to sulphate attacks (commonly found in soil and groundwater). It offers higher durability against these chemical reactions.
Masonry cement is a blended hydraulic cement designed for use in mortar for masonry construction. It's suitable for plastering masonry surfaces like bricks or concrete blocks.