Over time, the mortar holding your bricks together can crack, crumble, or fall out completely. Whether it’s due to weather, age, or poor installation, damaged mortar not only looks bad—it can also compromise the structural integrity of your wall or chimney. If you’ve noticed gaps or loose bricks, you might be wondering how to repair mortar between bricks. The good news is: with the right tools and a bit of patience, it’s a manageable DIY project. Here’s everything you need to know.
Why Learn How to Repair Mortar Between Bricks?
Mortar doesn’t last forever. Weather, moisture, and time eventually wear it down, leaving gaps that can let water in and weaken the structure. If you’ve spotted deterioration, it’s time to act. Knowing how to repair mortar between bricks helps you:
- Prevent water damage
- Improve structural integrity
- Preserve your home’s appearance
Tools & Materials You’ll Need
Before diving into how to repair mortar between bricks, make sure you have the following:
- Cold chisel or an angle grinder
- Hammer
- Tuckpointing trowel or pointing tool
- Joint raker (optional)
- Mortar mix (match the existing color and type)
- Bucket for mixing
- Stiff brush
- Safety gear: gloves, goggles, dust mask
Step 1: Remove the Old Mortar – The First Step in How to Repair Mortar Between Bricks
The first step in how to repair mortar between bricks is to remove the damaged mortar to a depth of about ¾ inch. Use a cold chisel and hammer for smaller jobs, or an angle grinder with a masonry blade for larger areas. Be careful not to chip the bricks.
Tip: Work slowly and steadily—rushing could cause unnecessary damage to your brickwork.
Step 2: Clean the Joints
Once the old mortar is out, brush away dust and debris with a stiff-bristle brush. You can also spray the joints with a little water to keep the new mortar from drying out too fast. This is an often-overlooked but important part of how to repair mortar between bricks properly.
Step 3: Mix Your Mortar
Follow the instructions on your mortar mix package, making sure to match the consistency of peanut butter. Using the right mortar type is crucial when learning how to repair mortar between bricks, as different types of bricks and structures require different mortar formulas.
Step 4: Apply the New Mortar
Using your pointing tool or tuckpointing trowel, pack the mortar firmly into the horizontal joints first, then the vertical ones. Press it in tightly and fill all gaps. This is the heart of how to repair mortar between bricks, so take your time to do it thoroughly.
Step 5: Tool the Joints
Once the mortar starts to set—usually after 30 to 60 minutes—use a jointing tool to smooth and shape the mortar. This gives your repair a clean, professional look and helps shed water properly. For an authentic finish, match the joint style of the surrounding area.
Step 6: Clean Up and Let It Cure
Brush off any excess mortar from the brick faces before it hardens completely. Let the mortar cure for several days, misting it lightly with water during dry or hot weather to prevent cracking. That’s the final stage of how to repair mortar between bricks, and proper curing ensures durability.
When to Call a Pro
While learning how to repair mortar between bricks is empowering, not all jobs are DIY-friendly. If you’re dealing with structural issues, historic brickwork, or large-scale repairs, it’s best to consult a professional mason.
How to Repair Mortar Between Bricks – Final Thoughts
Knowing how to repair mortar between bricks is a valuable skill for any homeowner. Regular maintenance can prevent serious damage and extend the life of your brickwork by decades. Whether you’re tackling a small section of wall or giving your chimney a facelift, following these steps will help you get the job done right.
