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A failing commercial roof is not just a maintenance problem — it’s an operational risk. Water intrusion damages inventory, equipment, and interiors. Emergency repairs disrupt staff and tenants. Premature failure forces unplanned capital expenditure. When a commercial or industrial property needs roofing work, the contractor you choose determines how long the solution lasts and how much it costs you over the life of the building.
United Roofers has delivered certified commercial roofing services across Ontario for over 20 years — for offices, retail stores, warehouses, industrial facilities, and multi-unit buildings. We specialize in flat and low-slope membrane systems, commercial metal roofing, and the full spectrum of repair, replacement, and maintenance programs that property managers and business owners need. With 85 five-star Google reviews, GAF/IKO/Owens Corning certification, and a 15-year transferable workmanship warranty, we deliver the accountability commercial projects require.
📞 Call (905) 789-1335 for your free commercial roofing assessment.
Commercial roofs fail gradually — and the cost of ignoring early signs is always higher than acting on them. Watch for:
Inside the building:
On the roof surface:
Age-based warning signs:
A thermal imaging inspection finds moisture trapped beneath the membrane that visual assessment misses — giving you an accurate picture of the roof’s actual condition before deciding on repair or replacement.
Business owners and property managers sometimes underestimate how different commercial roofing is from residential work. Key differences:
Flat and low-slope systems dominate. Most commercial buildings use flat or low-slope roofing — which means water doesn’t run off naturally. Proper drainage design, membrane integrity, and seam quality are critical in ways that don’t apply to a pitched residential roof.
Scale and access. Large commercial roofs require different equipment, crew sizing, and project management. An experienced commercial contractor plans access, phasing, and safety for large-footprint jobs.
Business continuity. A residential replacement disrupts a homeowner for one or two days. A commercial replacement on an occupied building needs to be phased, scheduled around operations, and managed to minimize tenant and staff impact.
Code compliance. Commercial roofing projects in Ontario must comply with the Ontario Building Code, local municipal requirements, and often insurance carrier specifications. A contractor unfamiliar with commercial compliance creates liability for the property owner.
System warranties. Major commercial roofing manufacturers issue system warranties — which require certified installation. Without certified installation, system warranties are void.
We handle all of it — certifiably, accountably, and with minimal disruption to your operations.
We install every major commercial and industrial roofing system — so our recommendation is based on your building, not on what we happen to carry.
The most widely installed commercial membrane in Ontario today. White or light-coloured TPO reflects solar heat (“cool roof”), reducing summer cooling costs significantly. Heat-welded seams create a bond stronger than the membrane itself — providing superior leak resistance. Ideal for most commercial and industrial applications. Lifespan: 20–30 years with proper maintenance.
A time-tested synthetic rubber membrane known for exceptional durability in Ontario’s freeze-thaw climate. EPDM remains flexible in sub-zero temperatures — resisting cracking and brittleness that affects other membranes. Available in black (heat absorption) or white (cool roof). Lifespans of 25–35 years are common with proper installation. Lifespan: 25–35 years.
The premium single-ply choice for restaurants, industrial facilities, and chemical processing environments. PVC is uniquely resistant to grease, oil, chemical exposure, and fire. Heat-welded seams provide the same bond strength as TPO. Higher initial cost, exceptional longevity in demanding applications. Lifespan: 20–30 years.
An asphalt-based system reinforced with SBS or APP polymers — combining the waterproofing redundancy of multi-layer systems with modern flexibility and UV resistance. SBS modification gives rubber-like elasticity to handle thermal movement. APP provides rigid UV resistance. Torch-applied, cold-applied, and self-adhering installation options. Our certified technicians are trained in torch-down applications — ensuring proper fusion and site safety. Lifespan: 20–30 years.
The original “tar and gravel” commercial system — multiple alternating layers of bitumen and reinforcing fabric topped with aggregate. BUR’s redundancy provides exceptional waterproofing and impact resistance. Still the right choice for certain industrial applications and retrofit situations. Lifespan: 20–40 years depending on number of plies.
For commercial buildings with any pitch — warehouses, manufacturing facilities, agricultural-commercial structures — commercial-grade standing seam metal roofing delivers the lowest lifecycle cost available. Interlocked panels resist wind uplift, shed snow, and eliminate the membrane replacement cycles of flat systems. Lifespan: 40–70+ years.
Commercial roof leak repair requires finding where water actually entered — not just where it appears inside. These are rarely the same location. Water travels under membranes and through insulation before appearing on an interior ceiling, often metres from the true breach.
We use thermal imaging to locate the actual entry point — mapping moisture distribution beneath the membrane surface. This precision means the repair addresses the real problem, not a guess.
Common commercial flat roof repairs we handle:
Step 1 — Free Roof Assessment: We schedule a professional assessment at your convenience — during business hours or after, to minimize disruption. Our team inspects the full roof, including thermal imaging where moisture detection is indicated. You receive an honest assessment of the current system’s condition.
Step 2 — Detailed Written Proposal: We provide a clear written scope covering system options, materials, timeline, staging plan, and pricing. For complex projects, we include a phasing plan that maintains access to critical building areas. No ambiguity, no surprises.
Step 3 — Permits and Scheduling: We manage required permits and coordinate the project schedule around your operational needs. After-hours and weekend work is available where continuity matters.
Step 4 — Certified Installation: Our crews install to manufacturer specifications — the requirement for system warranty coverage. Site safety, property protection, and daily cleanup are standard practice, not optional extras.
Step 5 — Final Inspection and Warranty: We conduct a final walkthrough with you, confirm drainage and system integrity, and deliver full warranty documentation — covering our 15-year workmanship warranty and manufacturer system warranty documentation. Both in writing.
<cite index=”28-1″>When a commercial roofing system is neglected, the secondary costs associated with interior damage, equipment loss, and business interruption can far exceed the price of a proactive maintenance plan.</cite> We offer customized maintenance programs for commercial property owners across Ontario:
A maintenance program typically costs a fraction of a single emergency repair — and extends roof life significantly beyond its nominal warranty period.
When a commercial roof fails suddenly — storm damage, sudden membrane failure, drainage emergency — every hour of water exposure multiplies the interior damage cost. United Roofers provides 24/7 emergency commercial roofing response across all Ontario service areas.
We stabilize the situation immediately — professional tarping, emergency drainage clearing, and temporary membrane sealing — then assess and plan the permanent repair. Full photo documentation is provided for insurance claims. We work directly with your insurance adjuster when storm or weather-event damage is involved.
📞 Emergency line: (905) 789-1335 — available 24 hours.
20+ years of commercial roofing experience across Ontario. We’ve worked on offices, retail centres, warehouses, industrial buildings, agricultural-commercial structures, and multi-unit residential. That range of real experience means we’ve seen and solved virtually every commercial roofing challenge.
Certified installation — protecting your system warranty. GAF, IKO, and Owens Corning certification means our installations qualify for manufacturer system warranties. Without certified installation, system warranties are void — a risk that costs property owners significantly when problems arise.
Thermal imaging and drone measurement. We use thermal cameras to detect moisture beneath membrane surfaces and satellite measurement for accurate project scoping. Precision tools mean accurate diagnosis and honest quotes — not estimates padded for uncertainty.
15-year transferable workmanship warranty. Every commercial installation is backed by 15 years of workmanship coverage — transferable if the property changes ownership. That’s accountability that outlasts most commercial leases.
Minimal disruption to your operations. We plan projects around your schedule — phased installation, after-hours work, clear daily communication, and job sites that don’t interfere with your business. Your operations continue.
85 five-star Google reviews. Not claimed — verified. Real property managers and business owners across Ontario have documented their experience. Read them before you call.
Full insurance and WSIB coverage. We carry full liability insurance and WSIB coverage on every commercial job site. Non-negotiable for responsible commercial property management.
How often should a commercial roof be inspected? Twice per year — spring and fall — plus immediately after any significant storm event. Regular inspections catch small problems before they become expensive emergencies and are often required to maintain manufacturer warranty validity.
How do I know if I need repair or full replacement? A thermal imaging inspection gives an accurate answer. Localized damage on a membrane with overall sound integrity = repair. Widespread moisture under the membrane, failing seams across large areas, or a system past its service life = replacement is the more cost-effective decision. We give you the honest answer after assessment.
How long does a commercial roof replacement take? Depends on roof size, system type, and phasing requirements. A standard commercial job is scoped and scheduled clearly before work begins. We commit to timelines and manage to them.
Will work disrupt my business or tenants? We plan specifically to minimize disruption — phasing, after-hours scheduling, and clear communication throughout. Most tenants and staff notice very little during a professionally managed commercial project.
Do you handle the permit process? Yes. Where municipal permits are required for commercial roofing projects in Ontario, we manage the permit process as part of the service.
What does your 15-year workmanship warranty cover? Defects in our installation workmanship for 15 years — transferable to new owners. Manufacturer system warranties are separate and documented at project completion. Both provided in writing.
Do you work on industrial and warehouse buildings? Yes — flat, low-slope, and pitched commercial metal roofing on industrial facilities of all sizes, including large-footprint warehouses and manufacturing buildings.
Can you help with insurance claims for storm-damaged commercial roofs? Yes. We document damage thoroughly — photos, thermal imaging reports, written assessments — and work directly with your insurance adjuster.
We provide commercial roofing services to businesses and property managers across our complete service area:
• Caledon • Shelburne • Brampton • Mono • Mississauga • Orangeville • Oakville • Cambridge • Kitchener • Guelph • Woodstock
• Puslinch • Waterloo • Ayr • Hamilton
And surrounding communities throughout Southern Ontario.
Brampton Office: 69 Eastern Ave Unit 202, Brampton, ON L6W 1X9 Cambridge Office: 520 Sheldon Dr Floor 1, Cambridge, ON N1T 2C1 Hours: Mon–Fri 7 AM–9 PM | Sat–Sun 8 AM–7 PM | 24/7 Emergency
Whether you need an emergency repair, a system replacement, or a proactive maintenance program — United Roofers delivers certified commercial roofing with minimal disruption and maximum accountability.
📞 Call (905) 789-1335 or +1 (877) 398-1412 (Toll Free) 💻 https://unitedroofersinc.com
[Get My Free Commercial Roofing Assessment →]
If you’re looking for reliable, high-quality roofing services, we’re the trusted choice for your next project!
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