TPO & PVC Membrane Roofing in Toronto & the GTA

That white membrane roof you see going onto plazas, mid-rise buildings and new laneway suites around Toronto is usually TPO, sometimes PVC. Building owners pick it for two reasons that hold up: the seams are heat-welded into a single monolithic sheet rather than glued, and the white surface reflects summer sun instead of soaking it up — which the top-floor tenants notice by August.

The weld is the whole story with single ply membrane roofing. Done right, a welded seam is stronger than the sheet around it; done at the wrong temperature by someone learning on your roof, it's a line of future leaks that looks fine on day one. TPO also demands clean detailing at drains and walls, because there's one layer between the weather and your deck — no second ply underneath as backup.

We quote TPO and PVC where the roof size and use justify them — larger flat roofs, buildings with cooling costs, restaurants where PVC's grease resistance earns its premium. On a small residential rear addition we'll often tell you the mobilization isn't worth it and a two-ply or EPDM roof serves you better. The quote is itemized either way, and welded test seams are part of how the job is run.

• Assessment of the existing roof, drainage and what the new assembly should be
• Tear-off, or recover over the existing roof where its condition genuinely permits
• Insulation above the deck, mechanically fastened or adhered, tapered to drains where needed
• TPO or PVC membrane installation with hot-air welded seams
• Test welds and seam probing as the work proceeds, not just at the end
• Prefabricated and field-welded flashings at walls, curbs, drains and penetrations
• New metal edge terminations and parapet cap details
• Walkway pads at rooftop units and service routes, plus full cleanup

• Roof area — TPO pricing improves with scale, which is why it suits larger roofs
• Membrane choice and thickness; PVC and thicker TPO cost more, and 60 mil ages better than 45
• Tear-off versus recover, and how much wet insulation comes out either way
• Attachment method — mechanically fastened is economical, fully adhered handles wind exposure better
• Rooftop equipment: every HVAC curb, gas line and drain is welded detail work
• Insulation thickness, since energy targets above the deck move both material and edge-metal costs
• Height and access for material staging on mid-rise work

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.