Quick Answer
City Roofing & Exteriors is Calgary's experienced flat roof contractor, specializing in TPO, EPDM, and SBS-modified bitumen systems for commercial and residential properties. With 15+ years serving Calgary businesses and homeowners, our in-house crews handle flat roof installation, repair, and full replacement across all Calgary quadrants and surrounding areas including Airdrie, Chestermere, and Cochrane.
Flat Roofing Systems We Install in Calgary
TPO Membrane Roofing
TPO (Thermoplastic Polyolefin) is a single-ply white reflective membrane with heat-welded seams. It is commonly used on larger commercial flat roofs where energy performance, seam strength, and long-term maintenance matter. City Roofing can assess whether a fully adhered, mechanically fastened, or ballasted TPO system suits your building.
EPDM Rubber Roofing
EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane known for flexibility in cold weather. It can be a good fit for low-slope roofs where building movement, freeze-thaw cycles, and maintenance access need to be considered. Warranty terms depend on the system, manufacturer, and installation details.
SBS Modified Bitumen
SBS-modified bitumen (torch-on) is widely used on Calgary flat roofs because it performs well through freeze-thaw cycles and chinook temperature swings. City Roofing installs two-ply and three-ply torch-on systems depending on exposure, drainage, access, and warranty requirements.
Built-Up Roofing (BUR)
Built-up roofing is a traditional multi-layer flat roof system with reinforcing felts and bitumen, often finished with gravel ballast or a cap sheet. It can still make sense for certain commercial roofs, especially where durability and service traffic matter. City Roofing repairs and installs BUR systems where they are the right fit.
Commercial Roofing Services Calgary
City Roofing & Exteriors services commercial flat roofs across Calgary and surrounding Alberta communities, including warehouses, retail plazas, industrial facilities, strata properties, and multi-unit residential buildings. Our team coordinates access and scheduling around your operations where possible, then provides clear workmanship and manufacturer documentation.
Warehouses & Industrial
Large-span flat roofs with mechanical penetrations, skylights, and high foot-traffic service areas.
Retail & Strip Plazas
Multi-tenant buildings with varied occupancy scheduling — phased roofing to keep tenants open.
Strata & Multi-Unit Residential
Condo boards and strata corporations with full documentation for reserve fund compliance.
Office Buildings
TPO and EPDM systems for low-slope office roofs, with minimal disruption to building operations.
Why Calgary Businesses Choose City Roofing
In-House Crews Only
We never subcontract our roofing work. Every installer is a trained City Roofing employee — consistent quality on every project.
Insurance Documentation Support
Our estimators document damage with photos, findings and scopes you can share with your insurer or adjuster.
SECOR Certified Safety
SECOR safety certification supports the documentation many commercial sites and property managers require before work begins.
Commercial Flat Roof Experience
Experience with warehouses, plazas, industrial properties, multi-unit buildings and managed commercial sites across Calgary.
Free Commercial Roof Assessments
We assess commercial flat roofs, explain the findings and provide a practical written next step.
Flat Roof Material Comparison
Choosing the right flat roof system for Calgary's climate depends on your building type, budget, and long-term maintenance preferences. The table below compares the four major systems City Roofing installs.
| Material | Lifespan | Calgary Climate Rating | Best For | Approx Cost/sqft |
|---|---|---|---|---|
| TPO | 20–30 yrs | ★★★★☆ | Large commercial, energy efficiency | $3.50–$5.50 |
| EPDM | 20–30 yrs | ★★★★★ | Cold climates, low-slope commercial | $3.00–$5.00 |
| Modified Bitumen (SBS) | 15–25 yrs | ★★★★★ | Calgary residential & commercial | $3.50–$6.00 |
| BUR | 20–30 yrs | ★★★★☆ | High foot-traffic, heavy-duty commercial | $4.00–$7.00 |
* Cost per square foot estimates reflect Calgary market pricing for supply and installation. Final pricing depends on roof size, access, substrate condition, and system specification.
Get a Free Commercial Roof Assessment
Our team provides free on-site assessments for commercial flat roofs across Calgary, with a written scope and clear next steps.
Calgary Flat Roof FAQ
How long does a flat roof last in Calgary's climate?
Quality flat roofing systems last 15–25 years in Calgary's climate with proper installation and maintenance. TPO and torch-on modified bitumen systems typically reach the higher end of that range.
Which flat roof material works well for Calgary winters?
SBS-modified bitumen (torch-on) is a proven choice for Calgary winters because it stays flexible in cold weather and handles freeze-thaw cycling well. EPDM is also widely used in cold climates.
Do you handle commercial insurance roof claims?
Yes. City Roofing documents commercial flat roof damage with photos, findings and repair or replacement recommendations you can share with your insurer or adjuster.
What areas of Calgary do you serve for flat roofing?
We serve all Calgary quadrants — NE, NW, SE, and SW — as well as Airdrie, Chestermere, Cochrane, and Okotoks. Call 403-608-9933 to confirm availability in your area.
Ready for a Free Flat Roof Assessment?
In-house crews. Free estimates. No pressure.