The meticulous process of renewing deteriorated mortar joints to restore structural integrity and weather protection to masonry walls. Critical for Ontario homes where freeze-thaw cycles accelerate mortar deterioration, repointing involves removing old mortar to proper depth and installing color-matched, weather-resistant mortar. Signs you need repointing include crumbling mortar, gaps you can insert a coin into, or previous poor-quality repairs. Professional repointing prevents water infiltration, stops structural settling, and can add decades to your masonry’s lifespan while maintaining historical authenticity.