A sound flat roof is designed to carry a normal winter’s snow. Have it cleared when buildup gets heavy, especially after rain or freezing rain makes the snow heavier, or if you notice overload signs: sticking doors, new cracks, creaking, a sagging ceiling. Hire insured pros and leave a layer of snow to protect the membrane.
When to clear it
- After a big storm followed by rain or freezing rain
- When drifts pile up against parapets or equipment
- When drains are frozen and water can’t escape
- On older buildings or those with known structural weaknesses
Overload warning signs
- Interior doors suddenly sticking on the top floor
- New cracks in ceilings or walls
- Unusual creaking
- A sagging ceiling or deformed beams
If you see these signs, leave the area and call professionals right away.
Clearing without damaging the membrane
- Plastic shovels only, never metal tools or picks
- Leave a few centimetres of snow on the membrane
- Clear drains and drifts first
Prepare in fall with our checklist. Frozen drains often cause leaks at the thaw.
Roof snow removal or flat roof repair
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General advice. If you see signs of structural overload, leave the area and contact a professional immediately.