How to Repair Flagstones?

Written by james j. siegel
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Flagstone has been a popular building choice for patios and walkways. But even the best flagstone installations can have problems, especially if cracks occur. A damaged flagstone can be very frustrating, especially if you've spent the last few days perfecting your work. However, there is no need to panic. Cracked and damaged stones can easily be removed and replaced. All you need is a replacement stone, some tools and the patience to get the job done right.

Skill level:

Things you need

  • Replacement flagstone
  • Stone chisel
  • Hammer
  • Mortar
  • Grout bag
  • Trowel
  • Jointer
  • Shop vacuum
  • Straightedge

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  1. 1

    Take a stone chisel and remove the mortar surrounding the damaged flagstone. Point the chisel toward the damaged stone, not away. Chiselling away from the damaged stone could damage neighbouring stones.

  2. 2

    If the stone is too awkward to remove after chiselling away the mortar, break it up with a hammer. Gently pound the flagstone until the smaller pieces can be removed. In order to avoid breaking nearby stones, do not hit the damaged flagstone too hard.

  3. 3

    Remove the broken flagstone pieces and then chisel away at any dried mortar that remains in the bottom of the hole.

  4. 4

    Take the replacement stone and see if it will fit in the hole. If the new stone is too wide, use the stone chisel and the hammer to shape it to the right size. When determining if the stone replacement will work, also take a look at its overall size. The stone needs to be level with the rest of the flagstones after it is placed in a new bed of mortar. If the stone is too small, it could create a dip in the patio or walkway.

  5. 5

    Take a shop vacuum and use it to remove any loose dirt or mortar that was left behind in the hole. Next, spray some water in the hole to moisten the surface.

  6. 6

    Mix a batch of mortar and spread it inside the hole with a trowel. Place the new flagstone on top of the mortar and press down. Use a straightedge to make sure that the new stone is level with the rest of the stones in the patio or walkway. Let the mortar dry for the next 24 hours.

  7. 7

    Fill a grout bag with another batch of mortar. Squeeze the mortar around the new flagstone. Then use a trowel to smooth out the mortar. If you want the mortar in the joints to have a concave look, use a jointer. Let the mortar dry again for another day.

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