This shows what happens to cement pointing on a limemortar wall, the pointing separates from the stones, water penetrates but cannot evapourate, the mortar softens, swells and pushes the pointing off. This only takes years.
This photograph shows where ivy has penetrated the mortar,even then the high aggregate mortar is sound and if repointed with a thin coat of lime mortar will self repair. If left, unless it affects stability, it will stand for another hundred years.
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