Which type of mortar has the highest compressive strength?

Mortar type M is known for having the highest compressive strength among the various types of mortar. It is formulated using a higher proportion of Portland cement and less lime, resulting in a mortar that can withstand significant loads and pressure. This makes it suitable for heavy-load-bearing walls and structures where durability is crucial.

Additionally, type M mortar has a compressive strength of 2,500 psi (pounds per square inch) or greater. Such strengths make it particularly effective for use in structural applications where strength is paramount. This type is often chosen for use in foundations, structural masonry projects, and situations where the mortar must resist frost and other harsh conditions.

The other types of mortar, such as S, N, and O, have increasing levels of compressive strength, but they do not reach the robust levels that type M achieves. Type S, while stronger than N and O, typically has a compressive strength ranging from 1,800 to 2,400 psi, and is used for exterior walls and other applications where moderate strength is needed. Type N, which features a compressive strength of 750 psi to 1,500 psi, is often utilized for building walls and non-load-bearing applications. Type O is a low-strength mortar