what's the difference between type n and type s mortar

When it comes to masonry work, choosing the right type of mortar is crucial for ensuring durability and performance. Two commonly used types are Type N and Type S mortars. In this article, we will answer the question: what's the difference between type N and type S mortar? Understanding their properties and suitable applications will help you make an informed decision for your construction or repair project.

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1. Composition

Both Type N and Type S mortars are made from a mixture of Portland cement, lime, and sand, but their proportions and specific characteristics differ:

• Type N: This mortar is composed of 1 part Portland cement, 1 part lime, and 6 parts sand. The high sand content gives it a relatively lower compressive strength.
• Type S: Type S mortar consists of 2 parts Portland cement, 1 part lime, and 9 parts sand, making it stronger than Type N due to its higher cement content.

2. Strength

One of the key distinctions between these mortars is their strength:

• Type N: Offers a compressive strength of about 750 psi. It is suitable for general purposes and can handle moderate loads.
• Type S: Provides a compressive strength of approximately 1,800 psi. This type of mortar is designed to withstand more significant structural loads and stresses.

3. Flexibility and Adhesion

The flexibility and adhesion properties of the two types also play a critical role in their application:

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• Type N: This mortar is more flexible, making it ideal for above-grade exterior and interior load-bearing walls, as well as areas subject to slight movement.
• Type S: Although less flexible than Type N, Type S has better adhesion, making it appropriate for use in foundations and below-grade applications. Its strength makes it suitable for structural applications such as retaining walls.

4. Applications

Choosing the right type of mortar depends on the specific needs of your project:

• Type N: Used in non-load bearing walls, chimney construction, and interior walls. Its moderate strength and flexibility make it suitable for various general masonry applications.
• Type S: Used in areas where extra strength is required, such as exterior walls, structural load-bearing walls, and where mortar needs to support significant weight.

5. Environmental Resistance

Lastly, consider the environmental factors that might affect your choice:

• Type N: Generally more vulnerable to weathering and is not recommended for applications exposed to high moisture or severe weather conditions.
• Type S: More resistant to water and weather, which makes it suitable for regions with harsher climates.

In summary, understanding what's the difference between type N and type S mortar is essential for selecting the right product for your project. Both offer unique characteristics that cater to different applications, so choose accordingly based on strength, flexibility, and environmental considerations.

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