Which type of mortar is best for non-load bearing walls?

Type N mortar is the most suitable choice for non-load bearing walls. This is because Type N mortar is designed with a balanced strength and workability that makes it ideal for use in general masonry, particularly where moderate strength and flexibility are required. It contains a mix of one part cement, one part lime, and six parts sand, providing enough strength for applications where the walls are not subjected to heavy loads.

Non-load bearing walls, such as those used for interior partitions or aesthetic surfaces, do not require the high compressive strength provided by other types of mortar. Instead, Type N allows for adequate adhesion and durability while accommodating some movement due to settling or changes in temperature. This quality is particularly important in non-load bearing applications, where the wall may be subject to slight flex or movement over time.

In contrast, the other types of mortar—Type S, Type M, and Type K—are formulated for stronger applications such as load-bearing walls or specific conditions, offering higher compressive strengths that are unnecessary for non-load bearing structures. Therefore, Type N is the most efficient and appropriate choice for non-load bearing masonry work.