This is what happens when you use modern strong cement-based mortars over soft 400-year-old brick and lime mortar. Trapped moisture has destroyed both bricks and mortar. Lime is the only way forward if you don’t want to harm your buildings.
This is what happens when you use modern strong cement-based mortars over soft 400-year-old brick and lime mortar. Trapped moisture has destroyed both bricks and mortar. Lime is the only way forward if you don’t want to harm your buildings.