Repointing is needed when mortar becomes powdery, recessed, cracked, or begins falling out. Delaying repairs can allow water to penetrate the wall core, leading to internal damp, frost damage, stone decay, and structural movement around openings such as lintels and rybats.

Scotland uses a mix of sandstone types (Craigleith, Hailes, Giffnock, Clashach), whinstone, and granite depending on region. Each stone has different hardness, porosity, and weathering behaviour. A skilled stonemason matches replacement stone and mortar to the original material to avoid accelerated decay or visual mismatch.

Lime mortar is breathable and flexible, allowing moisture to evaporate and the building to move naturally. Cement mortar is rigid and impermeable; it traps moisture in the stone, causing spalling, face loss, and internal damp. Many conservation projects involve removing inappropriate cement pointing and reinstating lime.

A conservation‑trained stonemason will assess the cause of decay, source a compatible stone, cut and dress it to match the original profile, and bed it in lime mortar. They avoid unnecessary removal, preserve as much original fabric as possible, and follow conservation principles such as minimal intervention and reversibility.

Minor like for like repairs with matching stone and lime mortar may not need consent. Changes to appearance large scale replacement and removal of historic features usually do. Check with your local conservation officer before you start and use a qualified stonemason for advice.

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