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Installing Flagstone Over an Existing Concrete Patio: Managing Cold Joints

You can mortar flagstone directly onto a clean, acid-washed concrete patio. The "cold joint" between old and new slab may telegraph a crack; prevent this by cutting a control joint in the flagstone at that line (½ inch deep minimum). Use polymer-modified mortar for bonding and sanded grout for joints. This avoids jackhammering while giving a beautiful stone surface.

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