Lime mortar repointing refers to the process of repairing or replacing the mortar between bricks in a masonry structure. Lime mortar is a traditional building material that is made from limestone and water, and it has been used for centuries in the construction of brick and stone structures.

Repointing is necessary when the mortar between bricks begins to deteriorate, allowing water to penetrate the structure and causing damage to the bricks. Repointing involves removing the old, damaged mortar and replacing it with new, fresh lime mortar.

Lime mortar has several advantages over modern cement-based mortars. Lime mortar is more flexible and breathable, which allows it to expand and contract with the bricks. This reduces the likelihood of cracking and spalling, and helps to preserve the integrity of the structure. Lime mortar also has a lower pH, which makes it less aggressive and less likely to damage the bricks