Which type of mortar is typically the strongest?

Type M mortar is recognized for its strength, making it the most suitable choice for applications requiring high compressive strength. This type of mortar is formulated with a higher cement-to-lime ratio, which enhances its durability and load-bearing capabilities. It has a compressive strength of about 2,500 psi (pounds per square inch), which allows it to withstand significant stress.

Due to its robust nature, Type M is often used in heavy-load applications, such as below-grade foundations and in construction that requires structural integrity, like load-bearing walls. It is also effective in environments where high resistance to weathering and moisture is essential.

The other types of mortar, such as Type O, Type N, and Type S, do not provide the same level of compressive strength and are, therefore, more suitable for different applications, such as interior work, non-load-bearing walls, or in moderate environments. Understanding the specific properties and appropriate applications of each mortar type is essential for ensuring lasting strength and performance in masonry construction.