TPO vs PVC Roofing for Burnaby Commercial Flat Roofs
TPO vs PVC Roofing for Burnaby Commercial Flat Roofs
For most Burnaby commercial flat roofs, TPO and PVC are both sound single-ply choices, and the deciding factor is what your roof is exposed to. If rooftop exhaust carries grease, oil or chemicals, PVC is the membrane built for that. If it doesn’t, TPO is generally the more budget-friendly option upfront. The rest comes down to detailing around rooftop units, the season your install lands in, and the warranty your building needs.
Hey, it’s Harman here. Below is how we think about the choice for Burnaby warehouses, strip malls, light-industrial units and strata podiums, where rain, moss-laden shade, HVAC curbs and parapet walls all test a membrane.
TL;DR
- PVC is highly resistant to animal fats, greases, oils and many industrial chemicals, so it suits restaurants, food processing and buildings with contaminated exhaust. GAF’s single-ply guide says as much.
- TPO is generally the more budget-friendly option upfront and is a strong fit for buildings without grease or chemical exposure.
- Both are heat-welded, so the quality of the welding crew matters as much as the membrane you pick.
- Both commonly last 20 to 30 years with proper care and installation, so choose on exposure, details and warranty rather than on a headline lifespan.
- Ask for a tender that names membrane thickness, insulation, cover board, flashing details and the warranty in writing.
Table of Contents
- What TPO and PVC have in common
- Where the two membranes differ
- Burnaby rooftops: what the membrane actually faces
- Choose PVC when the roof sits under grease or chemicals
- Choose TPO when the roof is clean and the budget matters
- Seams and welds: where the roof is won or lost
- Installing in a wet, cool Lower Mainland season
- How long will it last?
- Specifications, warranties and code in British Columbia
- Our perspective
- Talk to us about your Burnaby roof
- FAQ
- Sources
What TPO and PVC have in common
People often treat these as rivals from different worlds. They are closer than that. Both are thermoplastic membranes, and the Canadian Roofing Contractors’ Association notes that they are the most widely available in Canada, usually between 0.89 mm and 2.29 mm (35 to 90 mils) thick. They can be fully adhered, loose-laid and ballasted, mechanically fastened or installed with induction welding.
According to Construction Canada, both offer long-term weathering resistance, cold-temperature flexibility, resistance to tears, punctures and chemicals, and heat-seam capability. Both can reach UL Class A fire listings and FM wind-uplift classifications above 2224 N (500 lbf).
That shared baseline is why the decision usually turns on the few places where they differ.
Where the two membranes differ
| Factor | TPO | PVC |
|---|---|---|
| Grease, oil and chemical exposure | More susceptible to attack by certain industrial chemicals | Highly resistant to animal fats, greases, oils and many industrial chemicals |
| Upfront budget | Generally more budget-friendly | Generally higher upfront |
| Chlorine content | None; recyclable in production and at end of life | Contains chlorine |
| Stiffness at details | Stiffer sheet, which some crews find slower around penetrations | More flexible, easier to mould around penetrations |
| Track record | In use since the 1990s | In use for decades longer |
| Typical project types | Value-driven owners, sunny exposures | Restaurants, gas stations, airports, manufacturing |
The chemical and recycling points come from GAF’s product guidance. The project-type pairing matches Kingspan’s TPO vs PVC guide, which calls chemical and contaminant resistance the most important performance distinction between the two.
If you want our broader Vancouver-area walkthrough, we cover it in our real-world PVC vs TPO comparison and in a TPO explainer with a cost guide.
Burnaby rooftops: what the membrane actually faces
Burnaby’s commercial stock is a mix: tilt-up warehouses off the Big Bend, retail strips along Kingsway, office buildings near Metrotown and a growing number of mixed-use buildings. Their roofs share a few stresses.
Constant rain and long wet seasons. A single-ply roof has to stay waterproof through wind, rain, snow, UV and thermal shocks across its whole service life. That is the performance standard National Research Council researchers set out for membranes. In our wet Lower Mainland winters, the membrane itself rarely fails first. Drains, seams and flashings do.
Rooftop equipment. HVAC curbs, exhaust fans, plumbing stacks and conduit supports multiply the number of penetrations. Each one is a hand-welded detail, and that is where leaks begin.
Parapets and edges. Parapet walls and metal edge flashing need membrane that can be formed neatly into corners and terminations.
Exhaust. A restaurant, a commercial kitchen or a light-industrial unit puts grease and chemical residue onto the roof near the vents. This is the factor that most clearly separates the two membranes.
Choose PVC when the roof sits under grease or chemicals
If your tenant fries food, runs a commercial kitchen, processes materials or vents anything oily, PVC deserves the first look. GAF says PVC is highly resistant to animal fats, greases, oils and many industrial chemicals, and Kingspan says TPO may be more susceptible to attack by certain chemicals in industrial environments. That doesn’t make TPO a poor product. It means a roof near a restaurant exhaust is the job PVC was designed for.
PVC’s flexibility is also helpful on busy roofs. The Government of Alberta’s PVC technical document says it moulds easily around roof penetrations, which matters when you have a cluster of curbs and pipes. The same document says PVC is highly resistant to UV and wind, resists punctures and tears when installed over an insulation cover board, and needs minimal maintenance with easy repairs.
One long-running point: the National Research Council reports that plasticizer loss became a concern in the late 1980s and early 1990s because it made sheets brittle, and that high molecular weight plasticizers have since brought considerable improvement. When you compare quotes, ask the membrane’s current formulation and its manufacturer warranty terms.
Choose TPO when the roof is clean and the budget matters
For a warehouse, office block, school or retail unit with no grease exposure, TPO is a practical choice. It is generally the more budget-friendly option upfront. Per GAF, it is recyclable during production and at end of life and has no chlorine content, which some building owners and strata councils care about in their sustainability goals.
Kingspan describes TPO as well suited to value-driven building owners and long-term UV resistance. Its white or light surface is reflective, which suits a roof that gets sun on summer afternoons. Our clients ask more about drainage and leak risk than about cooling, though, so we weigh reflectivity lightly on a rainy-coast building.
TPO is stiffer than PVC, and that cuts both ways. Construction Canada notes some contractors say stiffer sheets are easier to position and less likely to shift and form voids while an automated welder runs a seam in cold weather. Around curbs and corners, the same stiffness asks more of the crew’s detailing. That is a point for choosing an experienced installer, not a reason to avoid the product.
Seams and welds: where the roof is won or lost
Both membranes are heat-welded. IIBEC’s technical article on welding thermoplastics explains that robotic welders do the field seams and hand-welders do flashings and details. It also describes how to read the weld:
- On PVC, a fine line of bleed-out shows the heat is set correctly.
- On TPO, bleed-out or smoke means the membrane is being overheated.
- A proper weld tears the film and exposes the reinforcement across most of the 1 to 1.5 inch weld width.
- Most welding errors happen in hand-welding, and test welds should be taken every 200 to 400 feet of seam.
The Government of Alberta adds that heat-welded PVC seams form a strong, watertight bond more reliable than glued or taped seams.
The practical takeaway for a Burnaby owner is simple. On a roof with a dozen curbs and a long parapet, most of the risk sits in the hand-welded details. Ask any bidder how they test welds, and whether the inspector will see test-weld records.
Installing in a wet, cool Lower Mainland season
Metro Vancouver doesn’t have many weeks of hard frost, but we do have many weeks of rain, and most single-ply roofs are detailed with adhesives and primers. The Government of Alberta notes that installation windows can be seasonally limited for PVC because of adhesive-dependent detailing, and that low-VOC adhesives and primers contain more water than standard bonding adhesives, with a cold-weather limit of -10°C. In Burnaby that rarely stops work for temperature. The real constraint is dry weather: wet substrates and wet seams don’t weld or bond well.
So plan the roof for the drier months where you can. If a leak forces a winter job, a good crew will sequence work in small, fully sealed sections so rain never gets under an open edge.
How long will it last?
The honest answer is 20 to 30 years with proper care and installation, for either membrane. SFS puts both in that range and notes TPO is relatively new and may last longer than first expected. The National Research Council says most single-ply manufacturers claim a service life of at least 15 years, so a manufacturer’s written warranty is the more reliable number to hold the project to.
What shortens lifespan on the coast is rarely the membrane chemistry. It is a blocked roof drain that leaves ponded water, a failed termination bar at a parapet, or a curb flashing that nobody inspected after a storm. A roof inspection after each autumn’s leaf-fall and each wet winter is the cheapest life extension you can buy.
Specifications, warranties and code in British Columbia
Before you sign, check these items.
- Standards. Section 9.26 of the BC Building Code lists CAN/CGSB-37.54, the standard for polyvinyl chloride roofing and waterproofing membrane. Ask your contractor which standard and which approved assembly applies to your roof.
- Slope and drainage. A low-slope roof must still shed water. BC Housing’s guidance on low-slope roofs cites Table 9.26.3.1 minimum and maximum slopes for modified bituminous membranes, which is a reminder that every roofing material has a slope range.
- Warranty. Some institutional owners require an RCABC warranty. For example, UBC’s technical guidelines call for a 5-year RCABC waterproofing warranty, 10 years of manufacturer’s material warranty and a performance bond for horizontal waterproofing. Private strata and commercial owners can ask for similar structure.
- Insulation and cover board. The Alberta document notes PVC’s puncture resistance depends on a cover board beneath it. Ask for the insulation and cover board by name in the quote.
- Roof access. If your tenants service rooftop units, ask about walkway pads. Foot traffic around equipment is the main wear point.
Our perspective
We get asked “which is better” about once a week. The better question is “which is better for this roof.”
A flat roof in Burnaby with a restaurant exhaust is a PVC conversation. A clean warehouse where the owner wants value over the next two decades is often a TPO conversation. Both can be excellent, and both can fail if the seams around the curbs are rushed.
What we focus on is the stuff the membrane brochure doesn’t cover: how water leaves the roof, how every penetration is flashed, and how the roof is inspected afterwards. Our approach to commercial roofing is built around city-specific problems like blocked drains, HVAC curb leaks and parapet wall leaks, because those are what actually come up in the Lower Mainland.
If a bid doesn’t tell you the membrane thickness, the cover board and who will weld the details, ask. A good contractor will want you to ask.
Harman
Talk to us about your Burnaby roof
If you manage a commercial building, a strata or a multi-family complex in Burnaby, we can look at drainage, penetrations and edges and help you decide what suits the roof. We handle commercial roof installation, repairs and maintenance, and we work with strata corporations through our strata and multifamily roofing services.
If the roof is already leaking, we also handle emergency roof repairs through our main page. Tell us what the building is used for, where the equipment sits and where the water shows up. That tells us most of what we need to start.
FAQ
Is TPO or PVC better for a restaurant roof?
PVC is usually the better fit. It is highly resistant to animal fats, greases, oils and many industrial chemicals, according to GAF. Kingspan also lists restaurants among the common PVC project types.
Is TPO cheaper than PVC?
TPO is generally the more budget-friendly option upfront. Your actual price depends on thickness, insulation, the number of penetrations and the access to the roof. Compare written quotes that list the same membrane thickness, insulation and warranty.
How long does a PVC roof last compared with TPO?
With proper care, both are commonly quoted at 20 to 30 years. The manufacturer’s warranty and the quality of the welded seams will tell you more about your own roof than a generic range.
Can TPO or PVC be installed in a Vancouver-area winter?
Often, with planning. Adhesive-based detailing sets limits, such as a -10°C minimum for some low-VOC products, and rain is a bigger issue in Burnaby than frost. Crews should seal each section before the weather changes.
What should I ask a roofer before choosing between them?
Ask about the building’s exhaust, the membrane thickness, the cover board and who will hand-weld the flashings. Also ask how welds are tested, and which warranty is offered.
Sources
- GAF: Single-Ply Commercial Roofing Systems, TPO and PVC
- Canadian Roofing Contractors’ Association: Thermoplastics
- Construction Canada: Thermoplastic membranes and the low-slope roofing market
- Kingspan: TPO vs. PVC Roofing Systems
- Government of Alberta: PVC Roofing Membrane
- National Research Council of Canada: Characteristics of membranes and insulations
- IIBEC: Critical Components of Welding Thermoplastic Membranes
- SFS: TPO and PVC roofing comparison
- BC Building Code Section 9.26 Roofing
- BC Housing: Retrofit and Renewal of Low Slope Vented Wood-Frame Roofs
- UBC Technical Guidelines: Dampproofing and Waterproofing
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