Filling defective joints is called?

• A. Pointing
• B. Tuck-pointing
• C. Repointing
• D. Caulking

Answer: (B)

Filling defective joints is the process of restoring mortar joints to seal the masonry and prevent water penetration. This is done by tuck-pointing, where deteriorated mortar is removed and new mortar is packed into the joints. A key feature of tuck-pointing is often adding a thin line of contrasting mortar along the joints to mimic fine, precise joints and improve appearance. Pointing is just finishing joints after the masonry is laid, not repairing existing defects. Repointing covers renewing deteriorated mortar in joints, but tuck-pointing is the specific technique of filling and finishing those joints, sometimes with a contrasting line. Caulking involves sealing gaps with a sealant, which isn’t the typical method for masonry mortar repair.