Which type of hydrated lime should be used for structural masonry walls?

Type S hydrated lime is specifically suited for structural masonry walls due to its properties that enhance the strength and durability of mortar. This type of lime offers good plasticity, which makes it easier to work with during the application process, and it contributes to a stronger bond between the masonry units. The use of Type S lime in mortar improves the water retention and flexibility of the mix, allowing for better performance in structural applications where movement and settling may occur.

Type S is often recommended for its optimal balance of workability and strength, which is crucial in ensuring that structural masonry can withstand various loads and stresses over time. Additionally, it resists air entrainment, which helps maintain the integrity of the structure against elements like freeze-thaw cycles, thereby making it a reliable choice for projects focused on long-term stability and performance.