Type N Mortar Mix vs. Type S Mortar Mix

Attribute	Type N Mortar Mix	Type S Mortar Mix
Strength	750 psi	1800 psi
Application	General masonry work	Structural masonry work
Flexibility	Good	Better
Water retention	Good	Excellent

Overview

When it comes to choosing the right mortar mix for your construction project, it's important to understand the differences between Type N and Type S mortar mixes. Both types are commonly used in masonry work, but they have distinct attributes that make them suitable for different applications.

Composition

Type N mortar mix is a medium-strength mortar mix that is made up of 1 part Portland cement, 1 part lime, and 6 parts sand. This mix is commonly used for exterior and above-grade walls, as well as for chimneys and brick veneer. On the other hand, Type S mortar mix is a high-strength mortar mix that is made up of 1 part Portland cement, 1/2 part lime, and 4.5 parts sand. This mix is typically used for below-grade applications, such as foundations and retaining walls.

Strength

One of the key differences between Type N and Type S mortar mixes is their strength. Type N mortar mix has a compressive strength of 750 psi, while Type S mortar mix has a compressive strength of 1800 psi. This means that Type S mortar mix is significantly stronger than Type N mortar mix, making it more suitable for applications where high strength is required.

Flexibility

Another important attribute to consider when choosing between Type N and Type S mortar mixes is their flexibility. Type N mortar mix is more flexible than Type S mortar mix, which makes it better suited for applications where some movement is expected, such as in walls that are exposed to temperature changes. On the other hand, Type S mortar mix is less flexible but offers greater strength, making it ideal for applications where stability is paramount.

Water Resistance

Water resistance is another factor to consider when choosing between Type N and Type S mortar mixes. Type N mortar mix is more porous than Type S mortar mix, which means it is more susceptible to water penetration. This makes Type N mortar mix less suitable for applications where water resistance is important, such as in areas with high moisture levels. Type S mortar mix, on the other hand, is less porous and offers better water resistance, making it a better choice for applications where water exposure is a concern.

Cost

Cost is also an important consideration when choosing between Type N and Type S mortar mixes. Type S mortar mix is typically more expensive than Type N mortar mix, due to its higher strength and better water resistance. While Type S mortar mix may be more costly upfront, it can offer long-term savings by reducing the need for repairs and maintenance. Type N mortar mix, on the other hand, is more affordable but may require more frequent maintenance in certain applications.

Conclusion

In conclusion, both Type N and Type S mortar mixes have their own unique attributes that make them suitable for different applications. Type N mortar mix is more flexible and cost-effective, making it a good choice for exterior and above-grade walls. Type S mortar mix, on the other hand, offers superior strength and water resistance, making it ideal for below-grade applications where stability and durability are key. Ultimately, the choice between Type N and Type S mortar mixes will depend on the specific requirements of your project and the conditions it will be exposed to.