Let’s talk about ice damming and why it causes roof leaks in winter.

Описание: Ice damming happens when heat escapes from inside a home or building and melts snow on the roof. That water flows downward, but when it reaches colder roof edges or areas above exterior walls, it refreezes and forms ice.
As ice builds up, it creates a dam. Water trapped behind it has nowhere to go, so it gets forced back under shingles or roof membranes. This is when leaks start appearing inside — often even when temperatures are below freezing.

Ice damming isn’t just a roofing issue. It’s usually caused by a combination of heat loss, poor ventilation, and blocked drainage. Removing snow and ice, keeping drains clear, and addressing insulation and ventilation issues helps prevent ice dams and costly water damage.

If you’re experiencing winter leaks, it’s important to address the cause early before damage spreads.

❄️ Ice damming can cause serious roof and interior damage if left unaddressed.
This issue is common on both shingle and flat roofs, especially during winter conditions when drainage is blocked.

📍 Serving Whitby, Durham Region & the GTA
👷‍♂️ 25+ years experience
🚨 Emergency roof leak service available
If you’re noticing ceiling stains, leaks, or heavy ice buildup, early action can help prevent expensive repairs.

👉 Need HELP? Contact Mega City Roofing Inc. for an inspection or emergency service.