Roof Snow Accumulations: A Critical Lesson from Ottawa’s Building Collapse
Winter in Canada brings breathtaking snowy landscapes but presents significant risks that property managers and building owners cannot afford to ignore. The recent collapse of a building in Ottawa due to excessive snow weight is a stark reminder of the dangers of unmanaged snow accumulation. This tragedy highlights the importance of proactive snow management to ensure the safety and longevity of buildings.
The Impact of Snow Weight on Buildings
While freshly fallen snow may seem light, it compacts over time, increasing in density and weight. This added stress can compromise a building’s structural integrity, especially on flat roofs, older buildings, and structures with pre-existing weaknesses. If left unchecked, heavy snow accumulation can lead to sagging, cracking, or, in extreme cases, catastrophic collapse.
Another critical concern is the freeze-thaw cycle. As snow melts and water seeps into porous building materials such as concrete, brick, and stone, it can refreeze when temperatures drop. This expansion creates internal pressure, causing cracks and structural deterioration over time.
Preventative Measures for Property Owners
Property managers and building owners should take a proactive approach to snow management to mitigate the risks associated with heavy snow accumulation. Key preventative measures include:
Regular Roof Inspections: Assess the structural capacity of your roof and identify vulnerabilities before winter begins.
Monitoring Snow Accumulation: Be aware of how much snow is accumulating, especially after significant storms.
Safe Snow Removal Practices: Use proper tools and techniques to clear snow without causing additional damage to the building.
Strategic Snow Piling: Avoid blocking pathways, drainage systems, and areas that could lead to refreezing hazards.
Compliance with Local Regulations: Follow city guidelines for snow removal to ensure public safety and accessibility.
This incident serves as a reminder of the critical role that winter maintenance plays in structural safety. Heavy snow accumulation is not just a seasonal inconvenience—it poses real risks that require attention and proactive management. By understanding these risks and implementing preventive measures, property managers and building owners can help safeguard structures, reduce liabilities, and most importantly, protect the people who rely on these buildings every day.
