If you have ever seen a Massachusetts stone foundation, it is likely that you have noticed worn out or missing mortar between the stones. What has happened is that spaces in the joints between the stones have eroded due to weathering and decay of the mortar. Once these voids are created, they become open pathways for water to get into the walls. Stone walls can be destroyed over time as the water expands and contracts during season changes. When the water freezes, it will expand and destroy mortar that has been weakened over time.
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