Most people think of brick as strong and solid — and it is. But over time, even the sturdiest brick walls can develop tiny gaps that let water sneak in. These small breaches might not seem like much at first, but left unchecked, they can lead to serious issues like damp patches, mould, and structural damage.
One of the most effective ways to stop moisture in its tracks is by maintaining the mortar joints between your bricks. Over the years, these joints can crack or wear away, leaving the wall vulnerable. This is where Brick Repointing becomes essential — a simple but crucial maintenance step that helps seal out moisture and restore your wall’s integrity.
Below, we’ll explore the tell-tale signs of trouble, what you can do to fix it, and how to keep your brickwork healthy in the long run.
Why Moisture Gets In
Brick itself is porous, meaning it absorbs a small amount of moisture naturally. That’s fine — it’s what the mortar is there to manage. Mortar works like a buffer, helping the wall “breathe” while channelling excess water away.
But over time, weather exposure, shifting foundations, or even poor original workmanship can lead to small cracks or gaps in that mortar. When this happens, moisture can seep into the wall cavity. That trapped moisture creates the perfect environment for rot, mould, and internal damp — all of which can affect the safety, appearance, and comfort of your home.
Spotting the Early Warning Signs
You don’t have to be a builder to notice the early red flags. Here’s what to look for:
- Crumbling or missing mortar between bricks
- White, powdery stains on the surface (efflorescence)
- Green patches or algae on the outside wall
- Peeling paint or plaster inside the house
- Musty smells around exterior-facing walls
If you notice any of these, it’s worth taking action before the damage spreads.
How Repointing Protects Your Home
When done properly, repointing removes the deteriorated mortar and replaces it with a new, weatherproof mix that closely matches the original. This not only seals the wall against moisture but also improves its strength and overall appearance.
Key benefits of repointing include:
- Blocking moisture entry before it reaches internal walls
- Preventing structural movement caused by water damage
- Improving energy efficiency by keeping damp out
- Enhancing curb appeal with clean, sharp brickwork
It’s one of those rare home maintenance jobs that’s both cosmetic and functional — a win-win.
DIY or Call in a Pro?
Repointing isn’t as simple as patching a bit of wall filler. It requires proper tools, a steady hand, and knowledge of mortar types. Using the wrong mix or technique can cause more harm than good, especially if the building is older or heritage-listed.
While small touch-ups can sometimes be handled on your own, full repointing jobs are best left to professionals — especially if the damage is widespread or affecting multiple walls. A skilled bricklayer will know how to match the original mortar, ensure proper curing, and maintain the structural integrity of your walls.
Keeping Moisture Away Long-Term
Once your walls are freshly repointed, it’s important to keep them in good shape. A few regular checks and simple precautions can go a long way:
1. Inspect After Heavy Rain
Look for wet spots, streaks, or signs of water tracking down the walls. It’s easiest to catch problems when the wall is still drying.
2. Keep Gutters Clear
Overflowing gutters or downpipes can direct water onto your brickwork, which accelerates damage. Make sure they’re regularly cleaned and positioned correctly.
3. Maintain Proper Drainage
Ensure the ground around your home slopes away from the foundation. Standing water near the base of your walls can lead to rising damp and internal moisture problems.
4. Seal External Cracks
Hairline cracks in render, sills, or flashing can let in moisture, even if the brickwork itself is sound. Deal with these before they grow.
When to Act
Don’t wait for the paint to bubble or mould to appear indoors. Once water gets behind your bricks, it’s far harder and more expensive to repair. A quick visual check every few months — especially after storms — can help you spot early signs before they become major headaches.
If you’re unsure whether your home needs repointing, most professionals will offer a free inspection or quote. It’s a small time investment that can prevent much bigger issues down the track.
A healthy home starts with a strong, dry foundation — and that means paying attention to what’s going on between the bricks. With a little upkeep and the right attention, your brickwork can stay both beautiful and functional for decades to come.