What common repair is used for deteriorated mortar joints?

Repointing is the correct choice for addressing deteriorated mortar joints. This process involves removing the old, damaged mortar and replacing it with new mortar. The goal of repointing is to restore the structural integrity and appearance of masonry or brickwork. Over time, mortar can deteriorate due to weather exposure, moisture, or other environmental factors, making it essential to carry out this repair to prevent further damage to the masonry structure.

Sealing typically refers to applying a protective layer or treatment to materials to prevent moisture infiltration, which may not directly address the structural issues related to deteriorated mortar joints. Grouting, on the other hand, is usually employed to fill gaps and voids, particularly in tile or stone applications, but is not specifically aimed at mortar joint restoration. Retrofitting generally involves adding elements to an existing structure to improve its performance or capacity, which is not the primary purpose when dealing with mortar joint deterioration. Therefore, repointing is the most appropriate and common repair method for this specific issue.