Commercial Roofing Frequently asked questions

Industry best practice — and many commercial lease agreements — require a minimum of two professional roof inspections per year: once in spring after winter's freeze-thaw damage, and once in fall before snow season begins. Additional inspections should follow any severe weather event — hailstorms, extreme winds, or heavy snowfall. Dominion Roofing's commercial roof inspection service provides documented assessments with photos and condition reports, giving you the data needed for capital planning and insurance compliance. Early detection of minor issues routinely saves property owners thousands in avoidable repair costs.

Dominion Roofing installs the full range of commercial flat roofing systems available in the Canadian market. The most commonly specified systems for Toronto's climate include Modified Bitumen (SBS and APP) — highly flexible, resistant to freeze-thaw cycling, and durable; UV-reflective; and EPDM (Ethylene Propylene Diene Monomer) — excellent longevity and flexibility in cold climates. We only use premium materials from certified suppliers. The right system depends on your building's structure, budget, insulation requirements, and long-term plans.

Minimizing operational disruption is a core part of our commercial project planning. We begin with a detailed site plan that identifies sensitive areas, access points, and any equipment or HVAC units that require special protection. Work is sequenced in manageable sections so that only a portion of your roof is open at any time. We coordinate with your facility manager on working hours — including evenings or weekends if required. For large commercial roof replacements, we also provide regular progress updates so you're never in the dark about timelines.

Commercial roof leaks most commonly originate from: failed or improperly installed flashings around HVAC curbs, vents, drains, and parapet walls; ponding water caused by blocked roof drains or inadequate slope; membrane seam failures due to UV degradation or improper installation; punctures from foot traffic or falling debris; and deteriorated or cracked caulking around penetrations. Our commercial roof repair team is experienced in diagnosing the true source of leaks — not just treating visible symptoms — and providing lasting repairs backed by our warranty.

Our commercial annual maintenance program is designed for property managers who want predictable, documented roof care. Each visit includes a comprehensive inspection of the membrane, flashings, drainage systems, and all penetrations; targeted minor repairs; cleaning of roof drains and gutters; and a written condition report. Having a documented maintenance history also supports warranty claims and can be valuable during property transactions. Enrolling in our maintenance program is one of the most cost-effective ways to extend your commercial roof's service life and avoid unplanned capital expenditures.

Yes. Commercial shingle roofing is a highly practical choice for low-rise commercial buildings, strip plazas, churches, and mixed-use properties with sloped roof sections. Commercial-grade architectural shingles offer superior durability and aesthetics compared to standard residential products. They are also faster to install than specialty roofing systems, which can translate to lower labour costs for large-footprint sloped roofs. Dominion installs commercial shingles from top-tier suppliers including BP, CertainTeed, and IKO, all with full manufacturer warranties.

Yes. Our commercial specialty roofing services cover cedar shake, natural slate, synthetic slate, and copper installations for commercial, institutional, and heritage buildings. These materials require experienced craftspeople who understand the nuances of installation — improper application can void warranties and lead to costly failures. Dominion Roofing has the skills and experience to work on the most demanding specialty roofing projects, whether it's a heritage church in downtown Toronto or a high-end commercial property seeking a distinctive architectural statement.

Absolutely. Dominion Roofing is an established partner for commercial developers and general contractors across the GTA. Our commercial new construction roofing team manages everything from pre-construction material estimation and scheduling to final installation and quality inspection. We have a proven record of completing large-scale commercial projects on time and on budget — which is critical in construction timelines where delays cascade. Contact us early in your project planning to discuss scopes, schedules, and specifications.

Commercial roofing warranties at Dominion are structured in layers: a manufacturer's material warranty covering the roofing membrane and ancillary materials, and a Dominion Roofing labour warranty covering workmanship and installation defects. Because we are certified installers for our key suppliers — including Soprema — our commercial projects qualify for enhanced manufacturer warranty programs. Detailed warranty terms are outlined on our warranty page.

This question depends on several key factors: the age of the existing system, the percentage of the membrane showing deterioration, the condition of the insulation below, and your long-term plans for the property. If fewer than 25% of the roof area has been compromised and the insulation is still functional, targeted commercial roof repairs are often cost-effective. However, if the membrane is nearing end-of-life, insulation is wet, or repair costs are approaching 30–40% of replacement costs, a full commercial roof replacement is the smarter investment. Our team will give you an honest assessment — not just the most profitable recommendation.

Ponding water — defined as water that remains standing on a roof surface for more than 48 hours after rainfall — is one of the most damaging and overlooked threats to commercial flat roofing systems. It accelerates membrane degradation, adds structural load (water weighs approximately 8.3 lbs per gallon), creates breeding grounds for algae and moss, and dramatically increases the risk of catastrophic failure during freeze-thaw cycles. The underlying cause is nearly always inadequate drainage slope or blocked roof drains. Our commercial inspection team identifies drainage problems and can recommend corrective solutions.

Yes — unprotected foot traffic is a leading cause of membrane punctures and premature deterioration on commercial rooftops. Every HVAC service call, antenna maintenance visit, or rooftop access by trades creates risk. The solution is to install designated walk pads or traffic paths made of durable membrane-compatible material that distributes weight and protects the underlying system. During our commercial inspections, we map existing high-traffic zones and recommend protective measures. This inexpensive addition significantly extends roof life and reduces the frequency of commercial repairs.

Best-practice commercial property management calls for maintaining a roof history file that includes: original installation records and specifications, all inspection reports with dates and findings, records of every repair (what was done, by whom, and when), warranty documents, and any photos of the roof condition over time. This file is invaluable for warranty claims, insurance purposes, capital planning, and due diligence during property sales. Dominion Roofing provides detailed written reports after every commercial inspection and repair — keeping your documentation complete and organized.

A properly specified commercial roof replacement is one of the highest-ROI energy efficiency upgrades available for a commercial building. By installing a continuous layer of rigid insulation (eliminating thermal bridging), specifying a cool roof membrane (white or reflective coatings), and ensuring proper air sealing at all penetrations, you can dramatically reduce heating and cooling loads. In Toronto's climate, the heating-season savings from improved roof insulation are especially significant. Some energy efficiency upgrades may qualify for utility incentives or green building certifications — ask our team for guidance when developing your project specification.

With proper installation and regular maintenance, commercial flat roofing systems in the GTA can achieve the following approximate service lives: Modified Bitumen (SBS) — 20–30 years; Built-Up Roofing (BUR) — 15–30 years. These ranges assume quality installation, a proactive maintenance program, and prompt attention to minor repairs before they compound. Neglected roofs can fail in half the expected time — making our annual maintenance program one of the best financial decisions a commercial property owner can make.

Yes. After severe weather events, our team provides detailed damage assessment reports with photographs and scopes of work that are formatted to support insurance claims. If you've experienced hail, wind, or storm damage, your first call should be to 416-789-0601 — we'll get on-site quickly to document the damage and secure the roof against further water intrusion while your claim is processed. Learn more about our commercial inspection services.

Getting a commercial roofing quote from Dominion is straightforward. Contact us by phone at 416-789-0601 or through our online appointment booking tool. Our commercial estimators will schedule a site visit to assess the building, measure the roof area, evaluate existing system conditions, and discuss your specific requirements and budget. We'll then provide a detailed written proposal outlining recommended scope, materials, warranty, and pricing.

Dominion Roofing is a fully licensed and insured roofing contractor operating in Ontario. We are certified installers for our major commercial roofing suppliers — a designation that is required to unlock enhanced manufacturer warranty programs. We are recipients of the prestigious BILD Sub-Contractor of the Year Award, which recognizes superior workmanship, safety standards, and customer service. Our team is trained in current WSIB and occupational health and safety standards. For developers and institutional clients who require contractor prequalification documentation, contact us and we will provide all necessary credentials. Learn more about our history on our About Us page.

Yes — and this is an area where Dominion's century of experience genuinely matters. Heritage and architecturally significant buildings often require original materials (or period-appropriate equivalents), specialized installation techniques, and sensitivity to conservation requirements. Our expertise in commercial specialty roofing — including natural slate, copper, and cedar shake — makes us one of the few Toronto roofing contractors qualified to work on buildings designated under the Ontario Heritage Act or subject to heritage overlay zoning. We're happy to review your building's designation requirements and develop a scope of work that respects both the architectural intent and your conservation obligations.

Commercial property owners and managers need a roofing partner who shows up, communicates clearly, and backs their work. With Dominion, you get over 100 years of institutional knowledge, a team that understands Toronto's unique climate challenges, certified installer status with leading manufacturers, award-recognized workmanship, and the financial stability of a company that has served the GTA continuously since 1922. Read what our clients say on our reviews page, explore our portfolio, and then reach out — we'd be glad to discuss how we can protect your asset.

Heavy snow accumulation on commercial flat roofs is a serious structural and safety risk. Water weighs approximately 8.3 lbs per gallon — and wet, compacted snow can weigh far more than the same volume of dry snow. Commercial flat roofs with blocked or frozen drains are particularly vulnerable. If you notice pooling meltwater that has nowhere to drain, or if snowfall has been unusually heavy, contact us at 416-789-0601.