Flat Roof Repair & Replacement in Calgary
Modified bitumen, EPDM, TPO, and built-up roofing. Commercial and residential flat-roof installations engineered for Alberta's freeze-thaw cycles.
Professional Flat Roof Repair & Replacement You Can Trust
Flat roofs in Calgary fail faster than pitched roofs because the freeze-thaw cycles, snow load, and water pooling all conspire against the membrane. A properly-installed flat roof system in Calgary requires correct drainage slope, premium membrane material rated for thermal cycling, and proper flashing details at every penetration and parapet wall. We install modified bitumen (mod-bit / torch-down), EPDM (rubber membrane), TPO (thermoplastic), and built-up roofing systems for commercial properties, residential garages, additions, and modern flat-roof homes.
Common Causes in Calgary Homes
We see these patterns repeatedly across Calgary and area. Knowing the cause helps us respond faster and recommend the right solution.
Membrane Cracking from Freeze-Thaw
Calgary's 100+ annual freeze-thaw cycles expand and contract flat-roof membranes daily — most failures happen at seams, penetrations, and parapet wall transitions.
Ponding Water Damage
Improper original slope causes water to pool on flat sections. Pooling for 24+ hours damages membrane integrity and accelerates breakdown by 3-5×.
Hail Damage to Membrane
Large hail can puncture or crack EPDM and mod-bit membranes, especially at older installations where the membrane has lost flexibility.
Penetration Failures
Vents, drains, HVAC curbs, and skylights are the most common flat-roof leak sources. Proper flashing detail prevents 90% of these failures.
Our Flat Roof Repair & Replacement Process
Step-by-step transparency from the first call through final reconstruction.
- 1
Inspection + Quote
We assess existing membrane condition, deck integrity, drainage, and penetration details. Written quote with system recommendation.
- 2
Tear-Off or Recover
Existing membrane removed (tear-off) or new system installed over existing (recover) depending on condition and code compliance.
- 3
Insulation & Drainage Correction
Tapered insulation added if needed to correct drainage slope. Deck repair where required.
- 4
Membrane Installation
Selected membrane installed to manufacturer specs with proper seam welding, flashings, and penetration sealing.
- 5
Inspection + Warranty Registration
Final walk-through, leak test (where applicable), and warranty registration.
Flat Roof FAQs
Common questions about flat roof repair & replacement in Calgary, AB.
Which flat roof system is best for Calgary?
For commercial: TPO (white reflective, energy efficient, 20-25 year life) or modified bitumen for budget-conscious projects. For residential garages and additions: EPDM rubber membrane (50+ year life, best cold-weather performance) or modified bitumen. Avoid older built-up roofing systems for new installs — they have largely been superseded by modern single-ply systems.
How long do flat roofs last in Calgary?
Modified bitumen: 15-20 years. TPO: 20-25 years. EPDM: 30-50 years. Built-up roofing: 20-30 years. Calgary's freeze-thaw cycles tend to shorten the upper end of these ranges by 3-5 years compared to milder climates.
Can you do residential flat roofs (garage, addition, modern home)?
Yes. We install flat roof systems on detached garages, home additions, dormers, and modern flat-roof residential designs across Calgary. Residential flat roof repair is one of the most common 'orphan' services local roofers refuse — we handle them as standard practice.
Related Services
Hail Damage Roof Repair
Free post-storm hail inspections with insurance-ready Xactimate reports. Local Calgary crews handle the repair and bill your insurance directly.
Roof Replacement
Full tear-off and re-roof for Calgary homes. Asphalt, metal, and premium architectural systems. 10-year workmanship guarantee.
Insurance Claim Assistance
Most Calgary homeowners leave thousands on the table by accepting the first adjuster estimate. Our claims specialist handles the whole file end-to-end.
Flat roof leaking or aging? Free inspection and written quote.
Locally owned & operated. Free inspection across Calgary and area.
Free inspection • Insurance approved • Local Alberta crews — never storm chasers