Commercial Flat Roof Installation in Calgary

A commercial flat roof is one of the largest assets on your building — and in Calgary, it has to survive 40°C summer swings, –30°C winters, sudden hailstorms and heavy spring snow melt. CMP Roofing installs flat and low-slope roofing systems built specifically for that climate, so Calgary businesses get a roof that performs for decades instead of leaking in a few seasons.

Flat roof systems we install in Calgary

We are system-agnostic: we recommend the membrane that fits your building, budget and how long you plan to own the property — never a one-size-fits-all spec.

• TPO (thermoplastic polyolefin) — a reflective, heat-welded white membrane that lowers cooling costs and resists punctures. Our most-specified system for Calgary offices, warehouses and retail.
• EPDM rubber — a proven, economical single-ply for large low-slope roofs, available fully-adhered, mechanically-fastened or ballasted.
• PVC membrane — the right choice where the roof is exposed to grease, oils or chemicals, such as restaurants and food-processing facilities.
• SBS 2-ply modified bitumen — a redundant, torch- or self-adhered system that handles foot traffic and Calgary's freeze-thaw exceptionally well.
• Built-up roofing (BUR) — multi-ply asphalt-and-gravel assemblies for maximum durability on heavy-use industrial roofs.

Built for Alberta weather

Every installation is detailed for our climate, not a generic spec sheet. That means correctly engineered insulation R-values to meet Alberta energy code, tapered insulation to eliminate ponding water, reinforced flashing at every penetration and parapet, and hail-rated membranes where exposure demands it. Proper drainage design is what separates a roof that lasts 25+ years from one that fails early — and it's where most budget installs cut corners.

Our flat roof installation process

1. Free on-site assessment — we inspect the existing roof and deck, document moisture and condition with photos, and confirm whether a recover or full tear-off is the smarter investment.
2. Transparent, itemized quote — system options, insulation, warranty terms and timeline, with no surprise add-ons.
3. Phased, low-disruption install — scheduled around your operations and kept watertight at every stage by certified crews.
4. Final inspection & warranty — we walk the finished roof with you and register your manufacturer and workmanship warranties.

Why Calgary businesses choose CMP Roofing

• 20+ years and 2,500+ commercial roofs completed across Calgary and Southern Alberta
• Fully licensed, WCB-covered and $10M+ liability insured
• Manufacturer-certified installers — your warranty is backed and valid
• Honest assessments and itemized quotes — no pressure, no hidden costs