What is the technique called for repairing mortar joints?

Tuck pointing is a masonry technique used specifically for repairing or renewing the mortar joints in brickwork or stonework. This process involves removing deteriorated mortar from the joints, typically both for aesthetic improvements and to maintain structural integrity. After the old mortar is removed, new mortar is applied into the joints and neatly finished to resemble the original work. This restoration not only enhances the appearance of the masonry but also helps prevent water intrusion and further deterioration.

The other techniques mentioned have different applications. Grinding typically refers to the process of preparing surfaces or removing material rather than specifically addressing mortar joints. Sealing generally involves applying a protective coating to surfaces to prevent moisture penetration or damage, and it is not focused on repairing joints but rather maintaining the entirety of the surface. Grouting, while it can be related to filling gaps between tiles or stones in certain construction contexts, is not the precise term used for the specific technique of repairing mortar joints, which is defined by the tuck pointing method. Understanding these distinctions is key to recognizing the correct terminology and methods used in masonry repair and preservation.