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So we pulled everything out. Every single piece of flagstone came up. The old base came out too. We excavated down to get a proper sub-base compacted, then rebuilt it with fresh base material and a drainage slope engineered into it. That's the part nobody sees, but it's exactly what makes the difference between a surface that holds up and one that fails again in a few years.
Then came the puzzle part - and we mean that literally. Every piece of irregular flagstone had to be flipped upside down to expose the less-weathered side, then fit back together like a giant mosaic. No two pieces are the same shape. You have to think several moves ahead, sort by size and edge profile, and keep the gaps consistent as you go. We finished the joints with poly sand, which locks everything in place and resists weeds far better than regular sand.
We also installed aluminum edging around the perimeter to give the whole system a clean, defined border and keep the base material from migrating out over time. It's a small detail that does a lot of work. The result is a surface that looks fresh, drains correctly, and has the structural integrity to hold up through Michigan winters without repeating the same problems.
This kind of work isn't just a cosmetic fix. It's a full reset - done right from the ground up. For any homeowner along the Peninsula Drive corridor dealing with sunken, cracked, or weathered flagstone, this is exactly the kind of detail in your job that saves you from having to do it all over again in three years.