Repointing Old Stone Walls
Lime mortar should be used for the repointing of old stone walls:
Traditional stone walls were built of large boulder stones laid in the ground, rather than a modern day reinforced concrete foundation.
Lime mortar was used in there construction, which is an extremely flexible and permeable material, as well as being self healing to a degree. But over time walls will settle and the lime pointing will crack to accommodate this movement.
Cracked and loose pointing allows water ingress into the core of the wall; this encourages damaging plant growth in masonry walls, which will further accelerate the problem. Another more serious problem is the damage caused by yearly “freeze and thaw cycles".
Even the most carefully built masonry wall will eventually need repointed. The importance of pointing stone walls should not be under estimated, mortar can account for around 15% of the overall surface area.
Repointing old stone walls is an art as well as a practical skill, Burgh Stonemasonry have years of experience as practitioners in this craft.
Badly executed work with inappropriate cement based mortars can spoil the look of a wall as well as trapping in moisture that will cause further decay. Work carried out using the correct materials can transform a tired old wall into a feature wall that shows of the various coloured hues of the sandstones and the skills of the stone masons individual building styles.
Mortar doesn’t last forever:
Repointing old stone walls is simply the task of removing the outer portion of the failed mortar joint and replacing with fresh lime mortar to match the original in both appearance and pointing style.