Commercial TPO Roof Replacement in Surrey, BC

Surrey, BC

Quick answer: Multigroup Contracting managed and delivered a $250K+ commercial roof replacement (in today's dollars) on an occupied multi-tenant industrial and office building in Surrey, BC, in spring 2021. About 28,000 sq ft of worn ballasted EPDM came off and a new 60 mil TPO roof went on in weeks, with tenants operating throughout and a 20-year manufacturer's warranty.

Project at a glance

Project type: Commercial flat roof replacement (ballasted EPDM to TPO)
Building: Occupied multi-tenant industrial and office building
Location: Surrey, BC
Roof area: Approximately 28,000 sq ft (main roof)
Project value: $250K+ in today's dollars (2026 dollars)
Completed: Spring 2021
Schedule: About 5 to 6 weeks from quote to completion, with the roofing done in roughly two weeks
Our role: Project management and delivery with our specialist roofing partner, one point of contact
Warranty: 20-year manufacturer's warranty
Special conditions: Building stayed occupied and operating throughout

Overview

A multi-tenant industrial and office building in Surrey had an aging ballasted EPDM roof in poor condition, and the tenants needed to keep working underneath it. We managed the full replacement and delivered it with our specialist roofing partner, giving the owner one point of contact from quote to finished roof.

Related services: Commercial construction · Warehouse renovations

What was the challenge?

The old roof was ballasted EPDM: a rubber membrane held down by a layer of river rock, over EPS insulation on a metal deck. It was in poor condition and had reached the point where patching no longer made sense.

Replacing it meant stripping tonnes of river-rock ballast and the old membrane off a large roof, on a building full of working tenants. Shutting the building down was not an option, so the whole job had to be planned around the people below.

What did the roof replacement include?

We managed the full replacement and delivered it with our specialist roofing partner. The new roof system included:

Ballast and old EPDM removed

The river-rock ballast and the worn EPDM membrane were removed down to the existing EPS insulation.

New high-density coverboard

A 1/2-inch high-density coverboard went down over the insulation to give the new membrane a firm, even base.

60 mil reinforced TPO membrane

A 60 mil reinforced TPO membrane was mechanically fastened to the deck, with every seam hot-air welded.

Penetrations and drains

New pipe boots, pitch pans and curbs at roof penetrations, and retrofit drain inserts at the roof drains.

Metal coping and counter-flashings

New pre-painted metal coping and counter-flashings around the roof perimeter.

Pavers at the access point

Pavers at the roof access point to protect the new membrane where people walk on and off the roof.

20-year manufacturer's warranty

The finished roof is covered by a 20-year manufacturer's warranty.

How did the building stay open during the roof replacement?

The tenants kept working the whole time. The job was planned around them from day one.

Tenants were given notice before work started, and site access and scheduling were coordinated so the work did not get in the way of the businesses below.

We handled the coordination end to end: quotes, tenant notices, site access, scheduling and payments. The owner dealt with one point of contact instead of managing the roofing trade directly.

The project moved fast. It took about 5 to 6 weeks from quote to completion, and the roofing itself was done in roughly two weeks of May 2021.

What were the results?

Approximately 28,000 sq ft of worn ballasted EPDM replaced with a new 60 mil TPO roof
About 5 to 6 weeks from quote to completion, with the roofing done in roughly two weeks
Building occupied and operating throughout
20-year manufacturer's warranty on the new roof
A $250K+ project in today's dollars, managed through one point of contact
Heavy river-rock ballast taken off the roof

Roof replacement photos: during and after

New high-density coverboard fastened with plates and a TPO membrane sheet being rolled out during a commercial roof replacement in Surrey — **DURING** — During: fastened coverboard and TPO membrane going down

Finished white TPO roof with new pre-painted metal coping along the roof edge of an occupied multi-tenant commercial building in Surrey, BC, with mountains on the horizon — **AFTER** — After: new TPO roof and metal coping

Roof access hatch with protective pavers and a new pipe boot flashing on a finished TPO roof in Surrey, BC — **AFTER** — After: pavers at the roof access point and a new pipe boot

Wide view of the finished 60 mil TPO main roof with welded seams and a retrofit roof drain on a commercial building in Surrey — **AFTER** — After: welded TPO seams and a retrofit drain across the main roof

Close view of new pre-painted metal coping capping the parapet of a finished TPO roof on a Surrey industrial building — **AFTER** — After: pre-painted metal coping at the roof edge

Exterior of the occupied multi-tenant industrial and office building in Surrey, BC, whose roof was replaced, showing its loading docks — **AFTER** — The building: occupied multi-tenant industrial and office space

Frequently asked questions

How long does a commercial roof replacement take?

It depends on roof size, condition, weather and material lead times. On this approximately 28,000 sq ft roof in Surrey, the project took about 5 to 6 weeks from quote to completion, and the roofing itself took roughly two weeks.

What is a TPO roof?

TPO (thermoplastic polyolefin) is a single-ply membrane used on flat and low-slope commercial roofs. Its seams are welded with hot air rather than glued. This project used a 60 mil reinforced TPO membrane, mechanically fastened over a new high-density coverboard.

Can tenants stay in the building during a roof replacement?

Yes, with planning. On this project the building stayed occupied and operating throughout. Tenants were given notice before work started, and site access and scheduling were coordinated around them.

Can a ballasted EPDM roof be replaced with TPO?

Yes. Here the river-rock ballast and old EPDM were removed down to the existing EPS insulation, a 1/2-inch high-density coverboard was added, and the new TPO membrane was mechanically fastened over it with hot-air welded seams.

What warranty comes with a new TPO roof?

It depends on the manufacturer and the roof system. This roof is covered by a 20-year manufacturer's warranty.

How much does a commercial roof replacement cost?

It depends on roof area, condition, the system chosen and access. For scale, this approximately 28,000 sq ft replacement was a $250K+ project in today's dollars (2026 dollars). Every roof needs its own assessment and quote.

Does Multigroup Contracting do the roofing itself?

We manage commercial roof replacements and deliver them with a specialist roofing partner. We coordinate quotes, tenant notices, site access, scheduling and payments, so the owner has one point of contact.

What areas do you serve?

We work across Metro Vancouver, including Surrey. See our service areas page for details.

Related guides

Planning a commercial roof replacement in Metro Vancouver?

Multigroup Contracting is a commercial general contractor serving Metro Vancouver since 2016. We are WorkSafeBC registered and carry $5 million in liability insurance. We manage commercial projects in occupied buildings, including roof replacements delivered with our specialist roofing partner, with one point of contact from quote to completion. Call 778-819-5933 or contact us to talk about your building. CONTACT US

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