Flat Roofing
Commercial Flat Roof
As Toronto’s trusted flat roofing specialists, Universal Roofs provides full-service commercial flat roof installation and replacement for warehouses, retail plazas, office complexes, and industrial buildings across the Greater Toronto Area. Our SOPREMA-certified installation team uses premium SBS modified bitumen and single-ply TPO/EPDM membrane systems engineered specifically for Toronto’s demanding freeze-thaw climate, delivering long-lasting, leak-free flat roofing solutions backed by manufacturer warranties of up to 25 years.
How Universal Roofs Delivers Commercial Flat Roof Solutions Across Toronto
Commercial flat roofs are among the most demanding roofing systems to install and maintain correctly. Toronto’s extreme seasonal temperature swings — from -25°C winter lows to +35°C summer highs — create relentless expansion and contraction cycles that punish poorly installed membranes. Universal Roofs brings years of hands-on commercial flat roofing experience to every project, ensuring your building stays protected year-round. Whether you need a complete roof replacement or targeted roof repair, our team delivers solutions that perform for decades.
Common Commercial Flat Roof Challenges Toronto Buildings Face
Commercial flat roofs in Toronto face a unique combination of challenges that accelerate deterioration. Freeze-thaw cycles cause membrane cracking and seam separation, while heavy snow loads (Toronto requires designs for snow loads up to 1.5 kPa) create ponding water that accelerates UV degradation. Over time, these forces compromise the waterproof envelope, leading to interior leaks, mold growth, inventory damage, and escalating emergency repair costs. Improperly flashed penetrations — HVAC units, skylights, plumbing vents — are the most common failure points. Universal Roofs addresses every one of these challenges with engineered systems designed specifically for Canadian commercial buildings.
What We Deliver With Every Commercial Flat Roofing Project
Every commercial flat roofing project we take on is engineered to achieve five critical outcomes: complete leak elimination, proper drainage with minimum 1/4-inch-per-foot slope, maximum energy efficiency through upgraded R-30+ insulation, code-compliant installation meeting Ontario Building Code Section 9.26, and a manufacturer-backed warranty of 15 to 25 years. We coordinate every project around your business schedule to minimize operational disruption, and we provide detailed documentation including warranty certificates and maintenance schedules.
Our Commercial Flat Roofing Systems and Solutions
We install three premium flat roofing systems depending on your building’s needs and budget. Our SOPREMA SBS modified bitumen system (torch-applied or cold-applied) delivers the highest puncture resistance and is our top recommendation for heavy-traffic roofs. Our IKO Armourplan TPO single-ply membrane offers excellent UV and chemical resistance for buildings with rooftop HVAC equipment. And our Carlisle EPDM system provides proven performance for large, unobstructed commercial roof areas. Every installation includes tapered insulation for proper drainage, DensDeck cover boards for enhanced fire resistance, and precision flashing at all penetrations, edges, and transitions. For buildings that could benefit from natural daylight, we also coordinate commercial skylight installation as part of the roofing project.
How Universal Roofs Approaches Commercial Flat Roof Projects in Toronto
1. Assessment & Preparation
Our process begins with a comprehensive roof assessment using moisture scanning and core sampling to identify all problem areas beneath the surface. We then safely remove all deteriorated roofing materials down to the structural deck, dispose of debris responsibly, and protect the building interior with temporary waterproofing during the tear-off phase. If we discover structural deck damage during demolition, our team handles all necessary repairs before proceeding — we never install a new system over compromised substrate.
2. Design & Planning
Our project manager designs a custom flat roofing system based on your building’s structural capacity, drainage requirements, insulation goals, and long-term performance expectations. We calculate proper slope using tapered insulation layouts (minimum 1/4 inch per foot to drains), specify appropriate membrane thickness, and select the right attachment method — mechanically fastened, fully adhered, or ballasted — based on wind uplift calculations for your building’s height, location, and exposure. You receive a detailed proposal with material specifications, manufacturer data sheets, a day-by-day project schedule, and transparent pricing. Learn more about our process on our flat roofing service page.
3. Materials Selection
We source exclusively from certified manufacturers including SOPREMA, IKO, and Carlisle — three of North America’s most trusted commercial roofing brands. All materials are CSA-certified, ULC-listed, and rated for Canadian climate conditions. Our insulation products meet or exceed Ontario Building Code minimum R-values, and our membrane systems carry Factory Mutual (FM) approvals for wind uplift and fire resistance. We never substitute materials or use lesser-grade products.
4. Installation & Craftsmanship
Our experienced crews install the complete roofing system following manufacturer specifications and Ontario Building Code requirements. We use proper staging, perimeter safety systems, and noise mitigation measures for occupied buildings. Every membrane seam is tested for integrity during installation — not just at final inspection. Our torch-applied installations follow strict hot-work safety protocols, and our cold-applied systems use low-VOC adhesives that meet indoor air quality standards for occupied buildings.
5. Quality Assurance
Every completed project undergoes a comprehensive quality assurance inspection including flood testing at all drain locations, thermal imaging to verify insulation continuity, and seam peel testing to confirm adhesion strength. We photograph the completed installation for warranty documentation, walk you through the finished work, and provide a maintenance manual specific to your roofing system. Contact us at any time after installation for questions or warranty service.
What You Can Expect From a Universal Roofs Flat Roof Installation
Our commercial flat roof installations consistently deliver: complete elimination of all active leaks, proper drainage with no ponding water after 48 hours, measurable energy savings through upgraded insulation (typical R-value improvement of 40-60%), and comprehensive warranty coverage including 10-year Universal Roofs workmanship warranty plus 15-25 year manufacturer material warranty. Our clients also report reduced HVAC costs, eliminated interior water damage, and improved tenant satisfaction. Visit our reviews page to see what Toronto commercial property owners say about working with us.
Premium Materials We Use for Commercial Flat Roofing
SOPREMA Soprastar SBS cap sheet (granulated), SOPREMA Sopralene Flam 180 base sheet, IKO Armourplan TPO 60-mil membrane, Carlisle SureWeld 80-mil EPDM membrane, DensDeck Prime roof board (1/4″ and 1/2″), Owens Corning FOAMULAR XPS insulation, SOPREMA Sopra-ISO polyisocyanurate tapered insulation, Drainage Solutions Canada custom scupper and internal drain assemblies, Chem Link M-1 and Mulehide sealants. All materials are sourced from authorized Canadian distributors with full manufacturer traceability.
Serving Commercial Properties Across the Greater Toronto Area
Universal Roofs serves commercial properties throughout Toronto and the GTA, from downtown Toronto office towers to suburban industrial parks in Scarborough, North York, Etobicoke, Mississauga, and Vaughan. Our team is familiar with local building codes, municipal permit requirements, and the specific roofing challenges that each area presents — including lake-effect snow loads in lakefront areas and increased wind exposure on high-rise properties. We hold active business licenses in Toronto and multiple GTA municipalities.
Why Toronto Businesses Choose Universal Roofs for Commercial Flat Roofing
Universal Roofs has built a reputation for reliable, high-quality commercial flat roofing across the Greater Toronto Area. Our SOPREMA Certified Contractor status, combined with our IKO Roofmaster designation and $5 million commercial general liability insurance, gives property managers the confidence that their roofing investment is protected. We are fully WSIB-registered and maintain a clean safety record on every project site.
Are you certified SOPREMA installers?
Yes. Our flat roofing team holds SOPREMA Certified Contractor status, which means every installation meets the manufacturer's strict quality standards and qualifies for extended NDL (No Dollar Limit) warranty coverage of up to 25 years. This certification requires annual training and on-site quality audits by SOPREMA representatives. Learn more on our flat roofing page.
Do you work on occupied commercial buildings?
Absolutely. We specialize in phased commercial installations that allow your business to continue operating during the roofing work. We coordinate schedules to minimize noise during business hours, use low-odor cold-applied systems when possible, and maintain clean, safe access to all building entrances throughout the project.
What warranty do you provide on flat roofing?
We provide a 10-year workmanship warranty on all commercial flat roof installations, in addition to the manufacturer's material warranty which typically ranges from 15 to 25 years depending on the system and configuration selected. For SOPREMA systems, we can provide NDL warranties that cover both material and labour. See our FAQ page for more warranty details.
Can you handle emergency flat roof repairs?
Yes. We offer emergency roof repair services for commercial properties across the GTA. Our team can respond within 24 hours to address active leaks and prevent further damage to your building, equipment, and inventory. Emergency repairs are performed with commercial-grade materials compatible with your existing roofing system.
Universal Roofs provides professional commercial flat roofing services across the Greater Toronto Area, including installation, replacement, and emergency repairs. Visit our flat roofing page for more details.
Common Questions About Commercial Flat Roofing in Toronto
How long does a commercial flat roof installation take?
The timeline depends on building size, existing roof condition, and scope of work. A typical 10,000-15,000 sq ft commercial flat roof replacement takes 5 to 10 business days, while larger projects may take 2-3 weeks. We provide a detailed day-by-day schedule before work begins so you can plan building operations accordingly. Weather delays are communicated immediately, and temporary waterproofing is maintained throughout.
What flat roofing system is best for Toronto's climate?
For Toronto's freeze-thaw climate, we typically recommend SOPREMA SBS modified bitumen for its superior flexibility at low temperatures (rated to -40°C) and excellent puncture resistance. For buildings with heavy rooftop equipment, IKO TPO offers excellent chemical and UV resistance. Our flat roofing specialists will assess your building and recommend the optimal system based on your specific conditions, usage patterns, and budget.
Do you handle permits and inspections?
Yes. We manage the entire permit process — from application submission to final inspection coordination — for every commercial project. This includes building permits from the City of Toronto or your local municipality, as well as any fire department reviews required for torch-applied installations. Permit fees are included in our project pricing with no surprises.
Can you improve drainage on an existing flat roof?
Yes. Poor drainage is one of the most common flat roof problems we solve. We install tapered polyiso insulation systems that create proper slope to drain locations, add internal drains or scuppers where needed, and upgrade overflow protection. Proper drainage extends the service life of any flat roofing system by 30-50%. We also offer standalone roof repair services for drainage improvements without a full replacement.
Need Help?
- 416-732-2421
- info@universalroofs.ca
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