Step 8: Fill in the Pattern

Mark Powers filling in the spiral pattern in his pebble mosaic
Photo: Kolin Smith
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Working from the center outward, continue laying stones as described in step 6. The joints between the stones should be tight, and the stones should touch each other in their middles. (It helps to place stones of similar size next to each other and to introduce smaller or larger stones gradually, as your pattern dictates.) Try to keep the height of the stones even as you lay them.
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    Tools List

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    • trenching spade
      Spade to dig out the base
    • 2x4
      2x4s to screed the concrete and hold a tarp in place as the mosaic dries
    • garden sprayer
      Garden sprayer or hose with fine-mist attachment
    • 2 nails and string
      Two large nails and string
    • garden spade
      Garden spade
    • 4x4s
      4x4 to set and level the stones. It should be about the length of the mosaic's radius so that you can work on one small section at a time.
    • mallet
      Rubber mallet
    • Natural Bristle Brush
      Paint brush to spread the topping mix.
    • mason's brush
      Stiff-bristled brush to shape and dress the topping mix.

    Shopping List

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    1. Sand and scrap plywood to make a box in which to lay out the mosaic's design. (Or spread the sand on a plastic tarp.)

    2. Mosaic stones. Choose flat pebbles or cobbles in colors you like. We used green and slate black from the Signature Stones collection at Stone Decorative

    3. Paver base

    4. Stone dust

    5. Concrete mix, such as Quikrete.6. Topping mix. Also known as sand mix, it's finer than concrete mix and contains no aggregate. Quikrete and other companies make it. You'll add it like grout between the joints after laying the stones.

    7. Pavers, bricks, or bluestones to surround the mosaic and hold it in place.

    8. Plastic tarp or sheeting