Winter in Ontario is rarely predictable — but this year has been especially demanding. Sustained cold temperatures, frequent snowfall, and repeated accumulation have created ongoing stress for many commercial and flat roofing systems.
Unlike fall, winter isn’t just about preparation — it’s about endurance. Small issues that might have been manageable early in the season can compound quickly when snow and ice remain in place for weeks at a time.
At Garcia Roofing, our certified experts help property owners stay ahead of these risks with proactive, mid-season winter maintenance. Here’s what you should be monitoring — and preparing for — throughout the winter.
Monitor Snow Loads Closely (Not Just After Major Storms)
Ontario’s snowfall can accumulate gradually or rapidly, especially during prolonged cold periods where snow does not melt between storms.
Snow buildup can lead to:
- Excess structural load
- Uneven weight distribution from drifting
- Ponding water during mid-winter thaws
- Increased risk of ice dam formation around drains and edges
Snow load should be monitored weekly during periods of frequent snowfall — not just after major storms. If accumulation is persistent or uneven, it may be time to plan removal rather than continue monitoring.
Schedule Professional Snow and Ice Removal When Thresholds Are Reached
Snow removal on flat roofs is not a one-size-fits-all decision. Removing snow too aggressively — or too late — can cause damage or create safety risks.
A certified roofing contractor uses:
- Non-abrasive tools to protect membranes
- Controlled removal techniques to avoid ice dam creation
- Proper fall protection and winter safety systems
In winters with repeated snowfall, removal may be required multiple times to manage cumulative load — even if no single storm seems extreme.
Watch for Ice Dams and Frozen Drains as Ongoing Risks
Ice dams remain one of the most common causes of winter roof leaks in Ontario, particularly during periods of fluctuating temperatures.
When snow melts during mild daytime temperatures and refreezes overnight, ice can form around:
- Drains
- Scuppers
- Parapet edges
What to watch for:
- Icicles forming near roof edges
- Persistent ponding water near drains
- Visible ice buildup blocking drainage paths
Frozen or partially blocked drains can develop gradually over weeks. Regular visual checks help catch problems before interior damage occurs.
Inspect Interior Spaces Regularly — Not Just Once
Interior warning signs often appear before exterior damage is visible, especially during extended cold periods.
Inspect interior spaces regularly for:
- Water stains or bubbling on ceilings
- Condensation near vents or HVAC units
- Musty or damp odors
- Drips near light fixtures or penetrations
During sustained winter conditions, interior checks should be part of routine building walkthroughs — not just reactionary inspections.
Confirm Safe Roof Access and Winter Safety Protocols
Winter roofing work carries higher risk due to ice, wind, and limited daylight.
Property owners should ensure:
- Roof access points are secure and ice-free
- Fall protection systems are in place and inspected
- Only trained and certified personnel access the roof
Establish clear winter access protocols early in the season so emergency or mid-winter work can be completed safely when needed.
Schedule a Mid-Winter Professional Inspection (Especially During Prolonged Cold)
Mid-winter inspections are especially valuable during winters with sustained snow cover and minimal melt periods.
Garcia Roofing’s mid-winter inspections focus on:
- Drain and scupper functionality
- Snow load distribution and drift patterns
- Ice dam development
- Membrane and flashing condition
These inspections help identify developing issues before they escalate into emergency leaks or structural concerns.
We’re not just here for today — we’re here for tomorrow as well.