Step 3: Fill the Joints

filling the joints in a stone walkway with fresh mortar
Photo: John W. Taylor
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Ladle the mortar into a grout bag or a zip-top bag that has a ½-inch-diameter hole you've snipped in a corner. Squeeze the mortar out in a smooth motion, forcing it to the bottom of the joints. Fill them up to 1 inch deep in one pass, leaving the mortar just proud of the stones. Deeper joints should be half filled, packed down with the trowel, then topped off. If any mortar lands on top of the stone, scrape it off immediately.
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    Tools List

    • safety glasses
      Safety glasses
    • gloves
      Gloves
    • knee pads
      Kneepads
    • 3-pound hammer
      3-pound hammer
    • mason's chisel and maul
      Masonry chisel
    • mason's brush
      Masonry brush
    • one-and-a-half inch paintbrush
      Paintbrush
    • brick trowel
      Brick trowel
    • grout bag
      Grout bag
    • pointing trowel
      Tuck-pointing trowel
    • mortar pan
      Mortar pan

    Shopping List

    1. 60-pound bag of sand/topping mix

    2. 1 gallon of acrylic fortifier

    3. Water