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When it comes to plastering, selecting the right type of mortar is crucial for achieving a flawless finish. With a plethora of options available, it can be overwhelming to determine which mortar is commonly used for plastering. In this comprehensive guide, we will delve into the various types of mortar and identify the ideal choice for achieving professional-quality plastering results.

1. Traditional Lime Mortar:
Traditional lime mortar has been used for centuries and remains a popular choice for plastering. Composed of lime putty, sand, and water, this mortar offers excellent workability and breathability. Its flexibility allows for natural expansion and contraction, making it ideal for historic restoration projects. Lime mortar also provides a beautiful, smooth finish and is compatible with a wide range of substrates.

2. Cement-Based Mortar:
Cement-based mortar, commonly known as cement plaster, has gained popularity due to its strength and durability. Comprising cement, sand, and water, this mortar is suitable for both interior and exterior plastering applications. It offers excellent adhesion and is resistant to cracking, making it a preferred choice for high-traffic areas. However, its lack of breathability can lead to moisture-related issues in certain situations.

3. Gypsum-Based Mortar:
Gypsum-based mortar, also known as gypsum plaster, is widely used for interior plastering. This mortar is composed of gypsum powder, water, and additives. It offers exceptional workability and sets quickly, allowing for faster completion of projects. Gypsum plaster provides a smooth, seamless finish and is particularly suitable for decorative applications. However, it is not recommended for areas exposed to moisture or extreme weather conditions.

4. Polymer-Modified Mortar:
Polymer-modified mortar, a modern innovation, combines the benefits of traditional mortars with enhanced properties. By incorporating polymers, such as acrylic or latex, into the mortar mix, it improves adhesion, flexibility, and water resistance. This type of mortar is commonly used for both interior and exterior plastering, especially in areas prone to moisture or temperature fluctuations. Polymer-modified mortar offers excellent crack resistance and is compatible with various substrates.

Conclusion:
Selecting the appropriate mortar for plastering is essential to achieve a high-quality finish that withstands the test of time. While traditional lime mortar and cement-based mortar are commonly used, gypsum-based mortar and polymer-modified mortar offer unique advantages for specific applications. Consider the project requirements, substrate conditions, and desired finish to determine the most suitable mortar type. By making an informed choice, you can ensure a successful plastering project that exceeds expectations.

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