Snow loading and roof collapse preparation

We’re in the middle of winter and snowstorms in Minnesota, so let’s talk about preventing snow
loading and roof collapses.  Adverse weather conditions can affect the structural integrity of buildings and can cause a partial or complete collapse.  You can minimize the risk of snow loading and roof collapse by planning, preparing, and taking prompt action to remove accumulated snow. 

The following safeguards can help prevent roof collapse:

• Continuously monitor winter storms and remove snow off roofs as soon as possible after each snowfall.
• Keep all drains clear and unblock debris (leaves, dirt, etc.) year round. The downspouts should also be clear.
• Keep the roof well maintained and do repairs/replacements as soon as required. 
• Keep workers trained and the proper equipment available for snow removal. 
• Keep an updated winter emergency response plan in effect, especially for snow removal. 
• Have a fall prevention plan that is compliant with local agency requirements before engaging in roof preparation activities.
• Confirm generators are in good condition and their fuel tanks are full. 
• Ensure fire hydrants and fire protection system control valves are visibly marked to avoid damage from snow removal equipment. 

After a snowfall

During a winter storm, it can be dangerous to be on the roofs. It is best to be prepared to take action after a snowfall.

• Do not allow unauthorized workers/persons on to roofs. All workers should be properly trained on snow removal and equipment use.
• Remove the snow systematically to maintain the balance of the structure. Use shovels and wheelbarrows. If using a snowblower, ensure that the auger is set to the highest level to prevent damage to the roof. 
• Do not create snow drifts by moving snow from one area on another.
• Verify all drains are clear of ice and snow to allow melting and runoff. If the roof is pitched and without drains, open paths to the eaves to ensure drainage and prevent ponding. 
• Inspect for any other roof damage and make necessary repairs when it is safe to do so. 

It is important to continue monitoring for winter storms and removing the snow off roofs as soon as possible, before the next storm comes in. When you protect your roof, you protect everything beneath it. 

Submitted by: Kate Connell, Loss Control Consultant