How to Repair Cracks in Stone Masonry

Written by jagg xaxx
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How to Repair Cracks in Stone Masonry
Masonry requires periodic maintenance. (Hemera Technologies/ Images)

Over time, a stone wall will succumb to weather, water, frost heaves and freeze-thaw cycles, resulting in cracking. Fixing these cracks early on can prevent more serious damage to your stone walls and extend their life significantly. If a stone wall is left unrepaired long enough that significant structural damage is done to the mortar between the stones, the wall may then require more extensive repair, including the removal and resetting of the stones. This can be a difficult process in a foundation wall, which of course has a house sitting on top of it.

Skill level:
Moderately Easy

Things you need

  • Caulk
  • Caulking gun
  • Mortar
  • Trowel
  • Work gloves

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    Repair Small Cracks

  1. 1

    Run a small bead of 100-percent silicone waterproof caulk over the surface of the crack in the mortar.

  2. 2

    Run your finger along the bead of caulk, driving it as deeply as possible into the crack and smearing it over the surface of the crack.

  3. 3

    Inspect the crack after the caulk has dried to be sure that there are no gaps where water can enter. If there are any cracks, apply more caulk to those areas and press it into the crack with your finger.

    Repair Larger Cracks

  1. 1

    Repair areas of mortar where there are large cracks or pieces of loose mortar by removing all of the loose mortar with the tip of a trowel.

  2. 2

    Apply fresh mortar in the gaps and cracks, pressing the mortar as far as possible into the cavities with a trowel. Combine mortar mix with water according to the proportions suggested on the packaging. Make the mortar roughly the consistency of stiff peanut butter. Wear gloves when mixing or working with mortar to prevent the lime in it from drying and cracking your skin.

  3. 3

    Cover the entire surface of the mortar between the stones with a fresh coat of mortar. This process is called "repointing." By covering all of the mortar rather than just the part that was cracked, you reduce the chance that water will get in behind your new repairs and cause more damage.

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