Stone buildings fail politely and get repaired brutally: hard cement pointing smeared over lime-built walls, mismatched patches, faces chiselled flat by pressure washing. The materials look eternal; the craft around them is what actually decides their next hundred years.
Mitchell & Andrew Building Services works masonry and stonework across Truro's granite-built stock and new stone projects alike, and this is the sympathetic version of the craft.
Why lime matters on older walls
Walls built before modern cement breathe: lime mortar handles moisture by absorbing and releasing it, moving slightly with the seasons, and sacrificing itself gently so the stone never has to. Repoint those walls in hard cement and the physics reverse: moisture trapped, movement resisted, and the stone faces spall while the proud cement grins on.
The rule is compatibility: soft joints for old walls, lime mixes matched to the original, and cement kept for the modern structures designed around it. It is not nostalgia; it is moisture engineering.
- Old walls breathe; lime lets them.
- Hard cement on soft stone sacrifices the stone.
- Match the mortar to the wall's era.
Repointing without wrecking the wall
Good repointing is mostly removal done gently: failed mortar raked and cut out to sound depth without widening joints or scarring arrises, dust cleared, joints dampened, then lime mortar packed and finished to match the wall's original profile. The wall should look quietly healthier, not freshly iced.
The finish is a discipline: joints struck slightly back from the face so the stone reads as the wall, weathered profiles matched, and no smearing across faces. Mitchell & Andrew Building Services points to the standard where the repair disappears at ten paces and satisfies at one.
- Cut out failed mortar without scarring stone.
- Lime packed, profiled, struck to match.
- Invisible at distance, correct up close.
Repairs and extensions that match
Stone repairs live or die on matching: replacement stone chosen for type, colour and coursing, bedded as the original was, and toothed into existing work rather than butted against it. An extension in stone carries the same brief at larger scale, new walls coursed and jointed so old and new converse politely.
The garden building in the photograph shows the standard: new stonework, traditionally coursed with proper quoins and capping, reading as though it had always stood there. That is the target for every stone job, new or repair.
New stonework built to last
New stone walls, buildings and features are the trade's long game: foundations sized for the mass, stone selected and sorted before laying, courses kept honest, and copings and cappings shedding the water that would otherwise live in the wall. Done right, new stonework is a century-scale asset from the first season.
The craft's economics favour patience: stonework is slower than blockwork and outlasts everything around it. Where a project wants permanence and place, granite walls, stone features, boundary work, the slow trade is the bargain.
Related pages
Questions customers ask
Why should old stone walls be pointed in lime rather than cement?
Because old walls manage moisture through their joints: lime breathes and flexes, cement traps and resists, and trapped moisture spalls the stone itself. Lime protects the wall; cement protects only itself.
Can you match new stonework to an existing building?
Yes: stone type, colour, coursing and joint profile are all matchable with care, and toothing new into old makes the junction structural rather than cosmetic. Matching is the craft's core skill.
Is stonework worth the premium over blockwork?
Where permanence, appearance and place matter, yes: stone outlasts and outdignifies. Where budget leads and render was always the finish, blockwork remains the honest choice.
Breathe with lime, repoint gently, match honestly, build new stone for the century: that is masonry as the buildings themselves expect it.
Mitchell & Andrew Building Services works stone across Truro to exactly that standard. The contact page starts with photographs of your wall.
