How to Repair Grout in Bricks With Caulk

When building a brick wall, grout or mortar is placed between the bricks to hold them together. This mortar, although hard, is weaker than the surrounding brick and prone to damage. The damage occurs for various reasons, but one main reason is the freeze and thaw cycles of winter. When water seeps into the cracks and freezes, it expands. This expanding will cause the grout or mortar to break apart. One possible fix for repairing this is to use a specialized caulk that is designed specifically for mortar repair.

• 1

  Remove all loose concrete from the area you wish to repair. Clean out the repair area with hot water and brush with a stiff wire brush.

• 2

  Cut the tip of the mortar repair caulk off at a 45-degree angle. The hole size at the tip should vary between 1/4 and 3/8 inch, depending on the size of the repair area. Puncture the inner seal with a nail or piercing wire of your caulk gun.

• 3

  Insert the caulk tube into your caulk gun and press the trigger repeatedly until you see the mortar repair caulk begin to emerge from the caulk tube.

• 4

  Fill the crack in the brick mortar with the mortar repair caulk. Tool the caulk with your finger until it resembles the surrounding grout or mortar.

• 5

  Clean up any excess with a damp cloth and allow to cure for at least 24 hours before painting.