How to Repair Brick Wall Mortar

One key way to repair brick walls or foundations is to maintain the integrity of the mortar that bonds the bricks together. Without a strong bond, these bricks will ultimately separate. If you want to keep your wall strong, you must repair any mortar that begins to disintegrate. This process is simple, even for a novice. Just follow the 4 steps below.

Things You'll Need:

  • Mortar Mix
  • Flat blade screwdriver
  • Spray bottle
  • Water
  • Scraper
  • Cement
  • Construction sand
  • Trowel
  • Small brush
  • Muriatic acid

Step 1 – Remove Loose Mortar

Use a flat blade screwdriver or ice pick to remove mortar that is weak or beginning to crumble. Wih a small brush, remove all loose mortar and dust.

Step 2 – Mix a Batch of New Mortar

Combine mortar mix, water, and sand, then mix until the mortar is the consistency of toothpaste. Add mortar color to match the existing mortar color.

Step 3 – Apply the New Mortar

Moisten the brick surface by spraying with water, then insert the mortar into the space from where the old mortar was removed.

Step 4 – Finish

Smooth the mortar surface until it is even with the brick and old mortar, then let it dry overnight. Remove mortar residue from the brick surface with muriatic acid and rise off the brick with a garden hose.