Top 5 Causes of Summer Water Damage in Toronto Homes (and How to Prevent Them)

Summer in Toronto and the GTA is known for heatwaves, humidity, and unpredictable thunderstorms. But while many homeowners are enjoying backyard BBQs and lake days, they may not realize that summer is also peak season for water damage.

At Restoration Canada, we specialize in water damage restoration in Toronto and the Greater Toronto Area (GTA). After helping hundreds of homeowners recover from costly repairs, we’ve seen the same causes of water damage again and again—especially during the summer.

Here are the top 5 causes of summer water damage in Toronto homes, and what you can do to protect your property.

1. Heavy Rainstorms and Flash Flooding

Toronto and the GTA experience intense thunderstorms in July and August. Sudden downpours can overwhelm drainage systems, leading to basement flooding and sewer backups.

What to do:

Install a sump pump with a battery backup.
Keep gutters and downspouts clean and clear of debris.
Ensure grading around your home slopes away from the foundation.
Schedule a professional inspection of your waterproofing systems.

If you’re already dealing with flooding, call our team for emergency water cleanup in Toronto.

2. Clogged Gutters and Downspouts

Over the summer, leaves, twigs, and debris can block gutters and downspouts, preventing water from draining away properly. This can lead to roof leaks and water seeping into walls and foundations.

What to do:

Clean your gutters at least twice each summer.
Install gutter guards to prevent clogs.
Check for signs of overflow during storms.
Inspect fascia boards for water stains or rot.

Our team offers inspections and water damage repair across the GTA to help spot problems early.

3. Broken or Leaking Appliances

Increased summer usage of washing machines, dishwashers, and air conditioning units can lead to leaks or overflowing appliances. If unnoticed, even a small leak can cause extensive water damage.

What to do:

Regularly check hoses and connections for cracks or bulges.
Install a water leak detector in laundry rooms and under sinks.
Avoid running major appliances while you’re out of the house.

4. Burst Pipes Due to High Pressure or Aging Plumbing

While pipe bursts are more common in winter, extreme summer heat and increased water pressure from irrigation or appliance use can strain old plumbing.

What to do:

Schedule a plumbing inspection before summer hits.
Replace any pipes showing signs of corrosion or wear.
Consider installing a pressure-reducing valve to protect your pipes.

We offer complete water damage restoration services in the GTA including plumbing referrals and damage assessment.

5. Poorly Sealed Windows and Doors

Summer storms combined with wind-driven rain can easily find their way into homes through unsealed windows and doors, leading to hidden water damage inside walls and floors.

What to do:

Reseal any cracked caulking around windows and doors.
Check for moisture buildup or discoloration near frames.
Install weatherstripping for extra protection.

If moisture has already made its way inside, our team provides moisture detection and water damage repair in Toronto and the GTA.

Don’t Wait Until It’s Too Late – Call the Toronto Water Damage Experts

Whether you’re in downtown Toronto, Mississauga, Brampton, Vaughan, Markham, or anywhere in the GTA, water damage can strike fast—and cause thousands of dollars in repairs.

At Restoration Canada, we provide: