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Mortar between bluestone capstones is cracking. What to replace with?

7 years ago

We have some built-in planters and capstones atop stone walls in our landscaping. These capstones are bluestone with half-inch wide joints that the mason filled with mortar. Nearly all the mortar joints are cracking and some have cracked so much that the mortar is falling out completely (the planting beds especially because they are not entirely resting on a wall, but rather overhang). We are in NE Ohio and the winters are obviously brutal. I'm wondering if I should chisel out the mortar in the areas where it's cracking and putting in something flexible instead. Any advice?

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