Ontario’s climate brings beauty—and challenges. For homeowners with brick exteriors, one of the most damaging natural forces is the freeze-thaw cycle. Though subtle, this recurring weather pattern can cause serious issues if left unaddressed.
Let’s break down how freeze-thaw cycles work, how they affect your brickwork, and most importantly, what you can do to prevent long-term damage.
What Is the Freeze-Thaw Cycle?
The freeze-thaw cycle occurs when water seeps into the small cracks and pores in bricks or mortar joints. As temperatures drop, this water freezes and expands, exerting pressure on the surrounding materials. When temperatures rise again, the ice melts—but the damage is already done.
In Ontario, this cycle can repeat dozens of times per season, especially during early winter and early spring. Each cycle may seem minor, but over time it leads to crumbling mortar, surface flaking (spalling), and even structural instability.
Common Signs of Freeze-Thaw Damage
Wondering if your home has already been affected? Look out for:
- Flaking brick surfaces (spalling)
- Cracked or crumbling mortar
- White residue on brick (efflorescence)
- Leaning or bulging brick walls
- Water leaks near windows or chimneys
- Loose or shifting bricks
These signs often start small but tend to spread quickly—especially after a harsh winter.
How to Prevent Freeze-Thaw Damage
The good news? Much of this damage is preventable with proactive maintenance. Here are five ways to protect your brickwork:
Inspect Seasonally: Walk around your property in spring and fall to check for early signs of cracking or flaking.
Address Small Cracks Quickly: Filling minor cracks before winter can prevent water from getting in and expanding.
Tuckpointing: This process removes damaged mortar and replaces it with new, weather-resistant material. It helps reseal the wall and extend its life.
Improve Drainage: Make sure downspouts, gutters, and grading keep water away from the walls and foundation.
Use Breathable Sealants Cautiously: Some brick sealants can help, but others trap moisture and worsen freeze-thaw damage. Always consult a masonry professional first.
When to Call a Masonry Expert
If you see cracked bricks, deteriorating mortar, or water leaks—especially after winter—it’s time to bring in a professional. At Fadom Construction, we’ve helped hundreds of homeowners in Mississauga, Toronto, Brampton, and beyond restore and protect their masonry.
Our services include:
- Brick replacement
- Tuckpointing
- Chimney and wall repair
- Mortar repointing
We don’t just fix—it’s our mission to future-proof your property against further damage.
👉 Learn more about our brick repair and restoration services
Final Thoughts
Ontario’s seasonal shifts aren’t going anywhere—but the damage they cause doesn’t have to be permanent. Understanding how freeze-thaw cycles affect your brickwork is the first step. With regular maintenance and expert help, your home can stand strong for generations to come.
Not sure if your home’s masonry is at risk?
Contact Fadom Construction today to book a professional assessment. We’re here to help—before the next freeze.