Get Free Inspection Call Now
WhatsApp
Flat & Torch-On Roofing · Lower Mainland BC

Flat & Torch-On Roofing
for the Lower Mainland

Modified bitumen, torch-on membrane, and TPO installations for residential and light commercial applications. Properly installed, properly drained.

Book Your Free Flat Roof Inspection — Takes 30 Seconds
No obligation  ·  Respond within one business day  ·  Or call 604-935-6976
WorkSafeBC RegisteredClearance verifiable online
$5M Liability InsuranceCertificate on request
Licensed BC ContractorBonded & compliant
500+ Completed RoofsLower Mainland & Fraser Valley
Stonnex Roofing BBB Business Review

BBB Accredited Business

Stonnex Roofing is an accredited member of the Better Business Bureau — a recognized standard of trust for homeowners across British Columbia.

Instant Roof Quote

Get Your Roof Price
in 60 Seconds.

Enter your address below to see real pricing from IKO, GAF, and Malarkey. No pressure, no obligation.

Flat Roofing Done Right
the First Time

Flat and low-slope roofing systems are among the most common in the Lower Mainland — and among the most commonly installed incorrectly. Proper drainage, correct membrane selection, and watertight terminations are critical to a flat roof that performs.

Stonnex installs torch-on modified bitumen, TPO, and EPDM membrane systems for residential additions, garages, suites, strata buildings, and light commercial applications.

  • Torch-on modified bitumen (SBS and APP)
  • TPO single-ply membrane
  • EPDM rubber membrane
  • Drainage assessment and re-sloping where needed
  • Parapet wall and edge detail waterproofing
Flat and torch-on roofing Lower Mainland
Flat Roof Systems

Choosing the Right
Membrane System

Torch-On Modified Bitumen

The most widely used system in BC residential construction. SBS and APP modified bitumen membranes are applied with a propane torch for a seamless, durable bond. 15–25 year lifespan.

TPO Single-Ply

Thermoplastic polyolefin membrane is heat-welded at seams for a continuous waterproof surface. Excellent for larger flat roofs and commercial applications. Energy-efficient white option available.

EPDM Rubber

Durable synthetic rubber membrane suited to extreme temperature cycling. Common on residential additions and garages. Bonded or mechanically fastened installation options.

Flat roof installation Lower Mainland

What We Install
Flat Roofing On

Flat and low-slope roofing applications across the Lower Mainland include:

  • Residential home additions and extensions
  • Secondary suites and laneway homes
  • Attached and detached garages
  • Strata building common areas and parkades
  • Light commercial and industrial buildings
  • Covered decks and pergola roofs

We assess drainage before every installation and re-slope or add drains where necessary to prevent ponding water — the leading cause of premature flat roof failure.

Common Questions

Flat Roofing
FAQs

How long does a flat roof last?
A properly installed torch-on modified bitumen roof lasts 15–25 years in BC conditions. TPO and EPDM systems can last 20–30 years with proper maintenance. Ponding water and blocked drains are the primary factors that shorten flat roof lifespan.
Can you reroof over an existing flat roof?
In some cases yes, but only if the existing membrane is in adequate condition and the deck is sound. In most cases we recommend removing the old membrane to inspect the decking and ensure proper drainage before installing the new system.
What's the difference between torch-on and TPO?
Torch-on is a multi-layer bitumen system applied with heat — it's well-suited to BC's wet climate and is the most common residential flat roofing choice. TPO is a single-ply membrane heat-welded at seams — better suited to larger commercial roofs where long seam runs make TPO's installation economics more favourable.
My flat roof is leaking. How quickly can you respond?
We prioritize active leaks. Call us at 604-935-6976 and we'll schedule an inspection as quickly as possible — typically within 24–48 hours.

Ready to Get Started?

Free inspection, no obligation. We respond within one business day.

Book Free Inspection 604-935-6976
What Homeowners Say

Trusted by Hundreds of
Lower Mainland Families

★★★★★

"Professional from the first call to final cleanup. The crew was respectful of our property and the workmanship is outstanding. Highly recommend Stonnex."

Michael T. — North Vancouver
★★★★★

"They gave us an honest assessment and a fair price. The roof looks beautiful and we felt informed at every step. This is how every contractor should operate."

Sarah K. — Burnaby
★★★★★

"Quick response, quality work, and they cleaned up completely after. We had quotes from three companies and Stonnex was the clear choice."

David L. — Langley
More Services

Other Ways
We Can Help