What are the different types of mortar?

The correct choice identifies the common types of mortar, which are Type N, Type S, Type M, and Type O. Each of these types has specific qualifications and uses that are important for masonry work.

Type N mortar, for instance, is a general-purpose mortar that has good workability and is suitable for above-grade walls in areas that require moderate strength. Its balanced composition makes it ideal for most applications in residential construction.

Type S mortar is stronger than Type N and offers excellent tensile and compressive strength, making it appropriate for structural applications such as load-bearing walls and in environments exposed to higher stress.

Type M mortar is the strongest of the common types and is used in applications requiring high strength, such as foundations and below-grade walls. Its resistance to water penetration makes it suitable for areas where moisture can pose a risk.

Type O mortar, being the weakest, is primarily used for interior non-load-bearing walls and for restoration work where flexibility and lower compressive strength are acceptable.

Knowing these categories helps in selecting the right mortar for various construction needs, ensuring durability and compliance with building codes.