TPO Roofing Mississauga: 50,000 Sq Ft Roof at Millomat Stampings
One 60 mil TPO system across a new addition and a re-roof of the existing building, with a 20-year warranty on labour and materials.
Call 1-833-775-7663 Mississauga · 60 mil TPO · 20 years on labour and materials
Karol Rajkowski
Vice President, OYH Roofing
Published February 18, 2025 · Updated October 1, 2026 · 5 min read
At a glance
In this TPO roofing Mississauga project, OYH Roofing installed a 60 mil TPO roofing system across 50,000 square feet at Millomat Stampings in Mississauga, Ontario. The job combined a new addition with a re-roof of the existing structure, and the finished roof carries a 20-year warranty on labour and materials.
Project details
This TPO roofing Mississauga project covered a 50,000 square foot industrial roof. Here is the job in one table.
| Item | Detail |
|---|---|
| Client | Millomat Stampings |
| Location | Mississauga, Ontario |
| Building type | Industrial |
| Roof area | 50,000 sq ft |
| Service | New addition plus re-roof of the existing structure |
| System | 60 mil TPO single-ply membrane |
| Warranty | 20 years on labour and materials |
Why one roof system across the addition and the existing building?
One continuous roof system across an addition and an existing building removes the weak point where a new roof ties into an old one.
This TPO roofing Mississauga job had two parts: a new addition that needed a roof from scratch, and an existing structure that needed a new roof. Where two different membranes of different ages meet, the transition is a common place for leaks to start. Covering the full 50,000 square feet with the same 60 mil TPO means one membrane, one set of details and one warranty.
Why 60 mil TPO for an industrial roof in Mississauga?
A 60 mil TPO membrane suits a large industrial roof because its seams are welded with hot air, its white surface reflects summer heat, and the thicker sheet stands up better to punctures than a thinner one.
TPO (thermoplastic polyolefin) is a single-ply membrane. Mil is the thickness, one thousandth of an inch, so a 60 mil sheet is thicker than the 45 mil sheets used on lighter-duty roofs. For TPO roofing Mississauga owners compare against other systems, here is where each one wins.
| System | Layers | Where it wins | Where another system wins |
|---|---|---|---|
| 60 mil TPO | Single ply, hot-air welded seams | Welded seams, reflective white surface, light weight | One layer; modified bitumen is tougher under heavy foot traffic |
| 2-ply modified bitumen | Base sheet plus cap sheet | Toughest underfoot, two layers of protection | Heavier, and a dark surface absorbs more summer heat |
| EPDM | Single ply rubber | Very flexible in cold weather, long track record | Seams are taped or adhered, not welded |
The membrane is the easy part of the job. Industry guidance from the National Roofing Contractors Association points to the details on single-ply roofs: seam quality and the flashings at curbs, drains, vents and parapets.
What does the 20-year labour and materials warranty cover?
This TPO roofing Mississauga project carries a 20-year warranty on labour and materials, so both the membrane and the workmanship are covered across the full 50,000 square feet, including the addition.
The exact coverage, and what the owner has to do to keep it valid, is set by the written warranty terms. That usually includes regular inspections and keeping records of any work done on the roof. Ask for the warranty document for your project and keep it with the building records.
How do you maintain an industrial TPO roof?
An industrial TPO roof needs an inspection at least twice a year, in spring and fall, plus a check after major storms. That applies to every TPO roofing Mississauga system we install.
| When | What to check |
|---|---|
| Spring, after the snow melts | Seams, flashings, drains, any damage from ice or ponding |
| Fall, before winter | Clear drains and debris, check flashings at curbs and parapets |
| After major storms | Wind or debris damage, blocked drains |
| Every rooftop service visit | Crews stay on walkway pads; keep oils and grease off the membrane |
Building staff should not walk the roof themselves, especially in winter or wet weather. Book the inspection and let a roofing crew do it with proper fall protection. We offer inspections to every TPO roofing Mississauga client.
Photos of the roof
Photos of this TPO roofing Mississauga project at Millomat Stampings.
TPO roofing Mississauga services from OYH Roofing
OYH Roofing handles TPO roofing Mississauga projects from its Oakville head office, next door to the city, and installs industrial, commercial and institutional flat roofs across Ontario.
Our commercial roofing services cover TPO, PVC, EPDM, modified bitumen and built-up roofing, plus inspections and commercial roof leak repair in Mississauga. Other work nearby includes the 53,000 square foot Mississauga industrial recover and the 60 mil TPO re-roof at Devi Mandir in Pickering. See the rest on the completed projects page.
Planning TPO roofing work in Mississauga?
For TPO roofing Mississauga work, tell us about the building and we will set up a free roof assessment and a written quote.
Call 1-833-775-7663Request an assessmentFrequently asked questions
What is the difference between 45 mil and 60 mil TPO?
The difference between 45 mil and 60 mil TPO is thickness. A mil is one thousandth of an inch, so a 60 mil membrane is one third thicker than a 45 mil membrane. The thicker sheet gives more resistance to punctures, which is why 60 mil was used on the Millomat Stampings industrial roof in Mississauga.
How long does a TPO industrial roof last?
A TPO industrial roof commonly lasts 20 years or more when it is installed as a full system and inspected twice a year. The Millomat Stampings roof carries a 20-year warranty on labour and materials, which reflects that expected service life. Blocked drains, punctures from foot traffic and skipped inspections are what usually shorten it.
Is TPO a good choice for industrial roofs in Mississauga?
TPO is a good choice for industrial roofs in Mississauga because its seams are welded with hot air, its white surface reflects summer heat, and it stays flexible through freeze-thaw cycles. Modified bitumen is tougher under heavy foot traffic, so the best system depends on the building and how the roof is used.
Can a new addition and an existing roof be covered by one system?
A new addition and an existing roof can be covered by one system, and the Millomat Stampings project is an example. OYH Roofing installed the same 60 mil TPO across the addition and the re-roofed existing structure, 50,000 square feet in total, so the whole roof shares one membrane and one warranty.
Does OYH Roofing install TPO roofs in Mississauga?
OYH Roofing installs TPO roofs in Mississauga, and the 50,000 square foot roof at Millomat Stampings is one example. The company is based at 2120 Speers Rd in Oakville and installs, repairs and inspects industrial, commercial and institutional flat roofs across Ontario. Call 1-833-775-7663 to book an assessment.
Karol Rajkowski
Vice President · OYH Roofing
Karol Rajkowski is Vice President of OYH Roofing, an Oakville-based ICI flat-roofing contractor whose projects include the City of Mississauga building at 3185 Mavis Rd and the Marriott Hotel in Vaughan. Learn more about the OYH team.
Sources
- OYH Roofing project record, Millomat Stampings, Mississauga (October 2026).
- National Roofing Contractors Association (NRCA), guidance on low-slope roof inspection and maintenance.
OYH Roofing, 2120 Speers Rd, Oakville, ON L6L 2X8 · 1-833-775-7663 · info@oyhroofing.ca