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Léa Noémie Plourde-Archer
Léa Noémie
Plourde-Archer

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How to Repair Mortar Joints

How to Repair Mortar Joints

Last modified: 2018/07/13 | 3 mins

Brick is a durable material. However, brick joints have the tendency to deteriorate much more rapidly. Over time, the mortar that is used to make the joints will start chipping, thus affecting the watertightness of the surface.

It is very important to fix damaged joints before you start facing bigger problems like water ingress.

Here are a few tips on how to fix mortar joints:

First step: diagnosing the problem. If the mortar joints are highly damaged, they will have to be redone completely. Any superficial repairs would only push the problem back to a later date. However, if the cracks are still relatively small, you can fix the situation rapidly by applying a small coat of mortar.

Equipment needed to fix mortar joints

To repair mortar joints, you will need the following tools and equipment : 

  • Mortar (a special mortar product created specifically to redo joints is available on the market; ask hardware store employees to guide you towards the right product)
  • Gloves
  • Safety glasses
  • Scraper
  • Chisel
  • Hammer
  • Trowel
  • Rigid brush or paintbrush
  • Water (garden hose or filled-up bucket)

Fixing mortar joints is a dirty job

Mortar creates a lot of dust and dirt, therefore it is recommended that you wear safety glasses and gloves when handling the product. If you have breathing problems, you should also wear a mask.

Before you get on with the work, make sure that the weather conditions are ideal. If completing the task during the winter, you will have to employ a protective measure to ensure that the mortar does not freeze before having completed its drying period.

In the summer, high temperatures could also cause problems with the process, as the mortar will have a tendency to dry too quickly. To avoid new cracks forming, the surface must be protected from both the sun and the heat.

During the drying period, the surface should also be protected from wind and rain.

how to fix a mortar joint

Photo:This Old house

Steps to follow to fix mortar joints

Before you start applying the new mortar, you’ll have to meticulously remove any trace of damaged mortar. When you start digging with the hammer and the chisel, be very careful not to damage the bricks. According to the Heritage and Quality renovation guide, if you see that more than half the mortar is crumbling, it’s better to remove the bricks in order to redo the full mortar bed.

Using a brush and a small amount of water, try to remove all remaining residue in the empty joints. Afterwards, wet the section on which you will be working. Mix the mortar with a trowel until smooth.

Still using the trowel, gradually spread several thin coats of mortar; letting the product dry between each coat (the drying process is very quick). Keep going until you’ve filled the joint.

Once the mortar has dried and is hard enough, you can create a nice finish for the joint by adding a bit of mortar on the surface and pressing down with your trowel. Damaged brick walls can lead to severe problems.

Brick joints hold an important role in ensuring the wall’s watertightness and they also help the wall keep its structure. If the damage is too extensive, the wall could collapse. That’s why it’s so important to repair brick joints when they show signs of wear and tear.

Recap table of the steps to repair mortar joints between bricks

  1. Diagnose the extent of the problem;
  2. Gather the necessary equipment;
  3. Make sure that climatic conditions are good;
  4. Remove the damaged mortar, being careful not to damage the bricks;
  5. Get rid of the remaining residue;
  6. Wet the section where you will be working;
  7. Mix the mortar with a trowel;
  8. Gradually spread several thin layers of mortar;
  9. Allow the mortar to dry between each layer;
  10. Continue until the hole is filled up;
  11. Work on the finishing touches.

Here are a few other articles about masonry that could be useful for you: 

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