Repair Brick Wall Cracks and Chipping

What You'll Need
Sand, lime, cement and water
Mortar mixer
Trowel for mortar
Dust brush
Detergent or soap

When you repair brick wall cracks and chipping you solve 2 problems: you improve the appearance of the wall and strengthen its structure. A cracked wall facilitates the buildup of dirt, water and other debris, so the structure of the wall may deteriorate in time. If you notice any cracks or chipping in your brick walls, you should repair them right away following some straightforward instructions. 


Step 1 – Identify Chips and Remove Damaged Mortar

Check the brick wall for cracks and chipping and identify the problem areas. Damaged mortar can be removed using a chisel. Pay attention when using the chisel, as you may accidentally cause additional chipping to the bricks.

Step 2 – Sand Chipped Bricks

If you find any chipped bricks, you will need to sand the area. Use 40- or 60-grit sandpaper if the brick is very rough or 120- or 200-grit sandpaper for smoother bricks.

Step 3 – Clean the Surface

After removing all damaged mortar and sanding the chipped bricks, you will have to clean the joints using a dust brush. You may also want to clean the mortar and the bricks. Use a mild detergent or soap. Allow the cleaned areas to dry for at least 12 hours.

Step 4 – Choose the Mortar

Mortar may come in various colors and textures, so when you repair your brick wall you need to get a type of brick mortar that will look similar to the mortar used in your walls. You may get a sample and take it to a hardware store to ensure the mortar you purchase will match the old one. Alternatively, you may also prepare mortar at home, using sand, lime, cement and water.

Step 5 – Prepare the Mortar

If you have purchased the mortar, you can mix it following the instructions on the label. If you prepare the mortar, you will have to get 6 parts sand, 2 parts lime and 1 part cement, which will be mixed with water. Use a mortar mixer to obtain a homogenous paste.

Step 6 – Fill the Joints and Cracks

Apply the mortar using a trowel. Make sure you deal with the areas where there are cracks and chipping. If the cracks are deep, make sure to push the mortar deep into the cracks, so that the wall will be sturdier and won’t facilitate the buildup of water or other debris. Don’t forget to fill the areas you removed damaged mortar from. Allow the treated surfaces to dry. The mortar dries slowly, so you may have to wait for up to 3 days for the brick wall to be completely dry.

Step 7 – Paint the Bricks

If there were large cracks in your brick wall and you filled these with mortar, you can paint the wall. Use water-based paints and make sure to apply a primer before painting.