Flat roofs are a popular choice for commercial buildings thanks to their clean lines, efficient use of space, and affordability. But in a city like Calgary — where heavy snow loads, freeze–thaw cycles, hailstorms, and high winds are common — proper flat roof maintenance is essential.
A well-maintained flat roof will prevent leaks, improve drainage, resist weather damage, and extend the lifespan of your commercial roofing system. Below are industry-proven tips to help protect your investment from Calgary’s unpredictable climate.
Table of Contents
- Why Flat Roof Maintenance Matters in Calgary
- Inspect Your Roof Regularly
- Clear Snow and Ice Buildup
- Ensure Proper Drainage
- Watch for Ponding Water
- Check Flashings and Seals
- Look for Membrane Damage
- Remove Debris Frequently
- Address Hail and Wind Damage Early
- Schedule Professional Roof Maintenance
- Final Thoughts
1. Why Flat Roof Maintenance Matters in Calgary
Calgary’s climate is one of the most challenging in Canada for roofing systems. Commercial flat roofs must endure:
- Rapid freeze–thaw cycles
- Heavy winter snow
- Sudden spring melts
- High winds
- Debris from storms
- Intense UV exposure
- Severe hail events
Without proper care, these conditions can quickly lead to:
❌ Leaks
❌ Membrane blistering
❌ Structural damage
❌ Insulation saturation
❌ Premature roof replacement
Regular maintenance significantly increases the lifespan of your roof and helps prevent costly emergency repairs.
2. Inspect Your Roof Regularly
Routine inspections are the foundation of a healthy flat roof. In Calgary, it’s recommended to inspect:
- Every spring (after snow and ice melt)
- Every fall (before harsh winter weather)
- After any major storm
Look for:
- Tears or punctures
- Loose fasteners
- Signs of moisture intrusion
- Membrane bubbling
- Clogged drainage areas
- Soft spots in the roof surface
Catching small issues early prevents large-scale damage later.
3. Clear Snow and Ice Buildup
Calgary winters can place tremendous weight on flat roofing systems.
Why snow removal matters:
- Reduces risk of structural overload
- Prevents excessive pressure on seams and membranes
- Minimizes roof leaks caused by ice dams
Use non-abrasive tools like plastic shovels or professional snow removal services. Avoid sharp tools that can damage the membrane.
4. Ensure Proper Drainage
An efficient drainage system is crucial for flat roofs. Calgary’s sudden temperature swings can cause rapid melting, overwhelming drains.
Check that:
- Roof drains are unclogged
- Scuppers are clear
- Gutters and downspouts are free of ice
- No debris is blocking water flow
Good drainage protects your roof from premature deterioration.
5. Watch for Ponding Water
Ponding water (standing water lasting more than 48 hours) is one of the most common causes of leakage on a flat roof.
Look for:
- Depressions in the membrane
- Areas where water consistently collects
- Spills or drainage failures
Long-term ponding can weaken materials, attract algae, and eat away at the roof membrane.
6. Check Flashings and Seals
Flashings protect vulnerable areas such as:
- HVAC curbs
- Skylights
- Roof edges
- Vents and pipes
- Parapet walls
High winds in Calgary can loosen flashings, while freeze–thaw cycles can degrade sealants. Inspect these areas for:
- Cracks
- Separation
- Missing pieces
- Exposed fasteners
Proper sealing protects your building envelope from leaks.
7. Look for Membrane Damage
Flat roof membranes (EPDM, TPO, PVC, BUR) can be damaged by:
- Hail impact
- Wind-driven debris
- UV exposure
- Standing water
- Freeze–thaw cycles
Watch for:
- Punctures
- Tears
- Blisters
- Shrinking
- Exposed insulation
Repairing membrane issues early prevents leaks from spreading into the building.
8. Remove Debris Frequently
Branches, leaves, gravel, and wind-blown debris accumulate quickly on large commercial roofs.
Debris can:
- Block drainage
- Trap moisture against the membrane
- Cause premature surface wear
- Hide signs of damage
A clean roof is a healthier, longer-lasting roof.
9. Address Hail and Wind Damage Early
Calgary is known for severe hailstorms — some of the most destructive in Canada. Hail can cause:
- Bruised membranes
- Surface cracking
- Punctures
- Exposed insulation
- Weak spots that later leak
High winds can lift flashings, tear membranes, and shift rooftop equipment.
If your building experiences a storm, schedule an inspection immediately.
10. Schedule Professional Roof Maintenance
While property managers can handle basic tasks, professional inspections provide:
- Infrared moisture scans
- Detailed membrane assessment
- Drainage system evaluation
- Early detection of hidden damage
- Documentation for insurance
Partnering with an exterior specialist ensures your flat roof remains safe, durable, and leak-resistant throughout Calgary’s harsh seasons.
11. Final Thoughts
Regular maintenance is the key to maximizing the performance and lifespan of a flat roofing system — especially in Calgary’s demanding climate. By keeping your roof inspected, cleared, and properly drained, you can prevent leaks, avoid costly repairs, and uphold the integrity of your building envelope year-round.
A well-maintained roof protects your investment, your operations, and your tenants. Contact us today.