Flat Roofing in Calgary: Repair & Replacement for Homes, Garages & Commercial Buildings
APEX Roofing Repair installs, repairs, and replaces flat and low-slope roofing systems across Calgary - SBS modified bitumen (torch-on), EPDM rubber, TPO membrane, and older tar-and-gravel roofs. Flat roofs fail differently than shingle roofs: water doesn't run off, it waits.
I'm Gjin Bajraktari, founder of APEX Roofing Repair INC. We respond to flat roof leaks 24/7 - because on a flat roof, "I'll look at it next week" is the most expensive sentence a building owner can say.
Flat Roof Systems We Work With
The right membrane depends on your building, budget, and how the roof drains. We quote the options side-by-side instead of pushing whatever's on the truck.
SBS Modified Bitumen (Torch-On)
The workhorse of Calgary flat roofing. Two-ply torch-applied membrane handles our freeze-thaw swings - from −30 °C January nights to +30 °C August afternoons - better than most single-ply systems. Expect 20–30 years from a properly installed two-ply SBS roof.
EPDM Rubber
A single-ply rubber membrane suited to garages and additions. Flexible at low temperatures, economical, and repairable - seams and perimeter shrinkage are its usual failure points, and both are fixable.
TPO Membrane
A heat-welded, white reflective single-ply common on newer commercial buildings. The reflective surface lowers summer cooling loads; welded seams outlast glued ones.
Tar & Gravel (Built-Up)
Thousands of older Calgary buildings still carry BUR roofs. We repair blisters, exposed felts, and drainage problems - and give you a straight answer on when patching stops making sense and conversion to SBS pays for itself.
What Actually Fails in Calgary
The membrane rarely fails in the middle first. In our repair work across Calgary, leaks trace back to a handful of repeat offenders:
- Ponding water - Calgary's spring melt refreezes nightly, and standing water ages every membrane. We correct slope with tapered insulation or add drainage.
- Failed flashings at parapet walls, HVAC curbs, and pipe boots - the seams between roof and everything-that-isn't-roof cause most leaks we fix.
- Ice damming at drains and scuppers. When the drain freezes, water finds the seams. Heat-traced drains solve chronic cases.
- Membrane splits and blisters from thermal cycling - Calgary roofs can swing 40 degrees in a single chinook day.
- Punctures from hail, dropped tools, and foot traffic. After the August 2024 hailstorm ($3.2 billion in insured losses), we patched flat roofs all autumn.
Small flat roof repairs done promptly routinely add 5–10 years to a system's life. That's the honest pitch for calling early.
Where Flat Roofs Are Won or Lost
Flat roofs leak at the edges, not the middle. This is the seam, flashing, and wall-transition work that decides whether a membrane reaches its rated life.
When Repairs Stop Holding, We Replace the System
Widespread blistering, saturated insulation, seams failing faster than we can patch them - that's when replacement is the honest call. Typical residential flat roofs (garages, additions) replace in 1–2 days; commercial projects are scheduled to keep your building open and dry throughout.
- 01
Core sample and moisture check - a small test section shows whether the insulation is wet. Wet insulation must come out; roofing over it traps the problem.
- 02
Tear-off or recover decision - the Alberta Building Code allows a recover over one existing layer in some cases. We tell you when it legitimately saves money and when it just hides rot.
- 03
Insulation and slope correction - tapered polyiso packages fix chronic ponding for good.
- 04
New membrane, flashings, and edge metal, installed to manufacturer spec so the material warranty actually holds.
- 05
Photo documentation of every layer - deck, insulation, membrane - before it's covered up.
Same Owner, Same Standard
Flat roofing companies in Calgary tend to chase big commercial contracts and treat a leaking garage as a nuisance call. We take both. APEX Roofing Repair INC. is an Alberta-registered corporation; I hold current Fall Protection certification (Worksite Safety Compliance Centre) and Canadian Red Cross First Aid & CPR/AED Level A - and I'm on-site, not in a sales office. Our 5.0 average rating comes from treating a 400 ft² garage roof with the same care as a strip mall.
Related services: roof inspection, roof replacement, skylight repair, and hail-resistant roofing.
Flat Roofing Questions
How much does flat roofing cost in Calgary?
How long does a flat roof last in Calgary?
Can you repair a flat roof in winter?
Is ponding water on a flat roof normal?
Do you handle insurance claims for hail damage on flat roofs?
Flat roof leaking right now?
We answer 24/7. Get a free, written flat roof assessment from Calgary's owner-run roofing team - homes, garages, and commercial buildings.