Brick and Concrete Repairs: A Step-by-Step Guide

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Fixing Cracks in Brick or Concrete Blocks: A DIY Solution

To repair a crack, cover it with masking tape and place a board over it. Use a tube to slowly fill the crack with grout.

Unless there is a major structural issue, repairing wide cracks in brick or concrete-block walls is a straightforward task. Don’t worry about achieving absolute perfection, as it is often sufficient to work around the damaged bricks rather than replacing them.

Necessary Tools:

  • Safety goggles
  • Cold chisel
  • Sledgehammer
  • Brick chisel
  • Wire brush
  • Garden hose
  • Mixing bucket and stir stick
  • Small sharp trowel
  • Wide board to cover crack
  • 2 x 4 prop
  • Large funnel
  • Rubber tubing to fit over funnel end
  • Mortar jointer or thin metal rod
  • Paintbrush

Materials Required:

  • Mortar mix
  • Portland cement
  • Hydrated lime
  • Sand
  • Scrap corrugated cardboard
  • Mortar coloring
  • Duct tape
  • Exterior paint or cement paint
  • Solvent for paint

Estimated Time: 3-4 hours for cleaning and initial filling; additional time depending on extent of damage
Firstly, wear safety goggles and use a cold chisel and sledgehammer to remove all crumbling brick and mortar from the crack. For cracks that go through a brick or concrete block, use a brick chisel to widen and undercut the break. Ensure that the crack is consistently wide, and clean the inside of the crack to its full depth. Wire-brush the crack, inside and out, to remove debris, and then flush it thoroughly with water from a garden hose.
If the crack only affects one layer of brick, use mortar to fill it. Mix a little mortar according to the instructions on the package, and spread it on a piece of corrugated cardboard. Once it dries, the true color will be revealed, allowing you to add mortar coloring as required to match the old mortar. When the test batch matches, mix enough mortar to fill the crack. Spray the crack with the garden hose and use a small, sharp trowel to fill the crack with mortar, treating it as one long joint.
Once the crack is packed with mortar, finish the surface with a jointer and trowel. Match the old joints where the crack follows a joint, and trowel the mortar to match the surface where the mended surface is block or brick. Allow the crack to cure for at least one week, spraying the patched area lightly with the garden hose several times a day during the curing period.
For very wide and deep cracks, fill them with a thin grout mixture. Wear safety goggles and clean the crack thoroughly with a chisel, wire brush, and water. Mix a small amount of filler using 1 part Portland cement, 1 part hydrated lime, and 6 parts sand. Mix the dry materials and add water slowly to form a thin, easily pourable grout. Add mortar coloring, testing the mixture on a piece of corrugated cardboard to match the color of the old mortar, and mix a bucketful of grout in the same proportions.
Quickly spray the inside of the crack lightly to dampen it. Mask the lower third of the crack with duct tape set flat over the opening. Set a wide board flat against the wall to hold the tape in place, and wedge it firmly upright with a 2 x 4.

To fill a crack, use a funnel and rubber tubing. Position the tubing in the crack and pour grout slowly into the funnel. Let the partially filled crack set for a day and then finish it with a mortar jointer or thin metal rod and trowel. Repeat the filling and finishing process section by section until the entire crack is filled. Mix and color the grout in the same proportion each time and let it cure for at least a week. For a painted wall, touch up the filled crack with the same exterior paint used on the wall. To hide the crack in a brick wall, use cement paint the same color as the bricks. For further tips and instructions on home repairs, read the Home-Repair Safety Tips and Home-Repair Tool Basics.


1. What are some common issues with brick and concrete that require repairs?

Common issues with brick and concrete that require repairs include cracking, chipping, spalling, and settling. These issues can be caused by age, weather conditions, or poor installation. Brick and concrete repairs are important to maintain the structural integrity of buildings and prevent further damage.

2. How do I know if my brick or concrete needs repair?

You should inspect your brick or concrete regularly for any signs of damage such as cracks, chips, or spalling. If you notice any issues, it is important to have them repaired as soon as possible to prevent further damage and maintain the integrity of the structure.

3. What materials do I need for brick and concrete repairs?

The materials needed for brick and concrete repairs will depend on the type and extent of damage. Common materials include mortar, concrete mix, brick and concrete sealers, and patching compounds. You will also need tools such as a trowel, chisel, and hammer.

4. Can I do brick and concrete repairs myself?

Minor repairs such as filling in cracks or small chips can be done by a homeowner with some DIY experience. However, more extensive repairs may require the assistance of a professional mason or contractor.

5. How do I repair a cracked brick?

To repair a cracked brick, you will need to remove the damaged brick and replace it with a new one. This will involve chiseling away the mortar around the damaged brick and carefully removing it. Once the new brick is in place, you will need to apply new mortar to secure it.

6. How do I repair a concrete sidewalk?

To repair a concrete sidewalk, you will need to remove any damaged or broken concrete and fill in the area with a concrete mix. Once the mix has set, you can smooth out the surface and apply a sealant to protect it from future damage.

7. How do I repair spalling concrete?

To repair spalling concrete, you will need to remove any loose or damaged concrete and clean the area. Then, you can apply a concrete patching compound to fill in the damaged area. Once the compound has set, you can sand it down to create a smooth surface.

8. How do I repair a concrete foundation?

Repairing a concrete foundation will depend on the extent of the damage. Minor cracks and chips can be filled in with a concrete patching compound, while more extensive damage may require professional assistance. It is important to address foundation damage as soon as possible to prevent further structural issues.

9. How do I prevent future brick and concrete damage?

To prevent future damage to your brick and concrete, it is important to maintain regular inspections and address any issues promptly. You can also apply sealers to protect against weather damage and use caution when using heavy equipment near concrete structures.

10. Can I paint over repaired brick or concrete?

Yes, you can paint over repaired brick or concrete once the repairs have fully cured and the surface has been cleaned and prepped. Make sure to use a paint that is suitable for the material and apply it according to the manufacturer’s instructions.

11. How long will brick and concrete repairs last?

The longevity of brick and concrete repairs will depend on the extent of the damage and the quality of the repair work. Properly done repairs can last for many years, but it is important to continue regular inspections and maintenance to prevent future damage.

12. Can I use DIY repair kits for brick and concrete repairs?

Yes, there are DIY repair kits available for minor brick and concrete repairs. However, it is important to carefully follow the manufacturer’s instructions and ensure that the kit is suitable for the type and extent of damage before attempting a repair.

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