![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCJWlpW78HepuLMyWLiCads4g2pK9LVYCSFbPO8e1KJ2GnmplKal__MGfWc4B96avDX2MuNavCm1YHM44Y4NL8csv_Jdrm5a3mz-7ETKOC0RLk6ytzgNhUOzZ0Aj5j-Tm9Lv1ZhRgJjTY/s320/limemortar27+006.jpg)
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.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5ipGCPbnBKashHjBjOfnhMgBrZRWE6ikfk8Ts9yBh8tQj9YXJZrI2RolgmKtYcVpB8xz0h0tvqJWhlz1SiMQ6QRlzpbKfX1S9o-sxUvYAkRWZOO0tASKUK-7CKrjvoioKpgKKu8-vkYo/s320/limemortar27+007.jpg)
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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