Which type of mortar is typically used for lower grade foundations?

Type M mortar is specifically formulated for structural applications and is known for its high compressive strength, making it ideal for use in lower grade foundations. This type of mortar is designed to handle significant loads and is often used in masonry structures where the strength of the mortar is crucial to the overall stability and durability of the construction.

The high strength of Type M mortar allows it to effectively bond with concrete and masonry units, providing solid structural support in areas that may experience more stress or pressure from the surrounding environment. As such, it is the preferred choice for foundation work where strength is essential.

Additionally, the composition of Type M mortar, which includes a higher ratio of cement to lime, contributes to its resistance to moisture and freezing, making it well-suited for foundations that may be subjected to a variety of weather conditions. This characteristic is essential to prevent deterioration and maintain the integrity of the structure over time.