Managing roof snow loads during and after the storm
How to Help Protect Against Roof Collapse
During the winter storm season, it is important to monitor weather conditions and roof conditions to help protect against roof collapse.
Monitor snow and ice accumulation across the entire roof of all buildings, including the amount of snow drifting along long ridge lines or on lower roof levels. When it is safe to do so, implement the snow removal plan.
During the Storm
Be cautious of where snow is placed when removing it from the roof.
Do not block building exits.
Do not bury equipment such as fire hydrants, fire department connections, fire sprinkler control valves, or gas and other utility valves.
Do not place piles where melting snow can cause seepage or flooding inside the building.
Be aware that wet snow and ice are far heavier than fresh light snow and that the visible depth of the snow may be deceiving.
Be aware of any warning signs that the building structure may be under significant stress and perhaps in danger of collapse. Signs may include:
Deflection or cracking of structural members.
Cracks that have recently developed in interior and exterior walls and ceilings.
Cracked or broken windows.
Sprinkler heads that are pushed down below dropped ceiling tiles.
Unusual creaking or popping sounds.
Doors or windows that bind or do not open and close properly due to racked frames.
If there are signs of deflection or damage to the building's structure, a qualified structural engineer should be contacted for an immediate inspection. Building evacuation, temporary shoring or similar forms of support may be warranted. Shutting down and draining sprinkler systems and shutdown of gas mains may be advisable if the roof condition deteriorates and collapse is considered likely.
Implement contingency plans if collapse is imminent or has occurred.