What are the types of mortar commonly used?

The correct answer identifies the types of mortar commonly used in construction, which are classified as M, N, S, and O types. Each type has specific properties that make it suitable for different applications:

• Type M mortar is the strongest, with a compressive strength of at least 2500 psi, making it suitable for load-bearing applications, such as foundations and structural walls.

• Type N mortar has a medium compressive strength (about 750 psi) and is typically used for above-grade interior and exterior walls because of its good bonding properties and flexibility.

• Type S mortar has a higher strength than Type N but lower than Type M, providing a good balance of strength and flexibility, ideal for structures exposed to severe weather or where lateral load is a concern.

• Type O mortar has a low compressive strength (about 350 psi) and is generally used for non-load-bearing applications, such as interior renovations or for masonry that requires some level of flexing, like historic brickwork.

These classifications are standardized in the industry and provide mason contractors with guidance on which type of mortar to use based on specific project requirements.

Understanding these types helps in selecting the right material for the job, which contributes to the durability and safety of the structure.