• 24/7 Emergency Flat Roof Service
  • Serving Brampton, the GTA & Ontario
Best Quality Roofing Works logo
647-405-3815
Commercial & Industrial

Commercial & Industrial Flat Roofing

Plazas, warehouses, offices, schools and places of worship across Ontario. Modified bitumen and built-up systems installed by a crew that works on flat roofs every day.
Built for Business

Roofing That Keeps Your Building Running

A failing commercial roof does not just leak. It damages stock, disrupts tenants, drives up heating costs and puts your building envelope at risk. We assess the whole system, tell you honestly whether it needs repair, an overlay or full replacement, and then complete the work on a schedule that fits around your operations.
  • Plazas, strip malls and retail buildings
  • Warehouses and industrial facilities
  • Offices, schools and places of worship
  • Multi-unit and low-rise residential buildings
  • Property management and tenant-occupied sites
Get a Free Quote
Call 647-405-3815
Our Services

What We Do on Commercial Roofs

From a single problem area to a complete tear-off and rebuild.

Roof Repair

Leaks, blistering, open seams, split laps and failed flashing repaired quickly, with the cause traced properly rather than patched over.

Roof Replacement

Complete tear-off and rebuild when a roof is past its service life, including insulation, vapour barrier and new membrane.

Roof Overlay

A second membrane installed over a structurally sound existing roof, a cost-effective way to add years without a full tear-off.

New Roof Installation

Full flat roof systems for new construction and building additions, detailed and flashed correctly from day one.

HVAC Cones & Curbs

Watertight curbs, cones and penetrations for rooftop units, vents and mechanical equipment.

Skylights

Skylight installation and replacement, sealed and flashed into the membrane so the opening does not become the weak point.

Drains & Ponding

Drain repairs, new drains and slope corrections to clear standing water before it works through the membrane.

Preventive Maintenance

Scheduled inspections that catch small failures early, the cheapest roofing work you will ever pay for.

24/7 Emergency Repairs

Active leak or storm damage? We respond any day, any hour, and make the roof safe before water spreads.

Roofing Systems

Systems We Install

Modified Bitumen (SBS)

Torch-applied or self-adhered two-ply SBS membrane. The workhorse of Ontario flat roofing, tough, proven and repairable.

Built-Up Roofing (BUR)

Multiple plies of felt and bitumen finished with gravel or a cap sheet, a heavy-duty system with a long track record.

Roof Overlay Systems

A new cap or full membrane installed over a sound existing roof, restoring performance at lower cost and downtime.

TPO Single-Ply

Heat-welded thermoplastic membrane with a bright, reflective white surface. Popular on warehouses and plazas for its energy performance and clean, seam-strong finish.

EPDM Rubber

A single-ply synthetic rubber membrane, fully adhered or mechanically fastened. Flexible in Ontario cold, forgiving on large open roof areas and simple to repair.

PVC Single-Ply

Hot-air welded PVC membrane with strong resistance to grease, chemicals and ponding water. The system of choice for restaurants and food processing facilities.

Anatomy of a Flat Roof

Where Flat Roofs Actually Fail

Tap the markers to see the points we inspect on every commercial roof.
Finished granulated modified bitumen flat roof in Ontario
Rooftop HVAC Curbs
Curbs under rooftop units must be built up and flashed into the membrane. Poorly detailed curbs are one of the most common leak sources on commercial roofs.
Gas Lines & Supports
Gas and conduit lines need proper sleepers and supports so they never sit directly on the membrane and wear it through.
Field Laps & Seams
Every lap between membrane sheets has to be fully welded. Open or fishmouthed seams let water travel under the cap sheet.
Parapet & Wall Flashing
Base flashing has to run up the parapet and be capped properly. Lifting or cracked flashing is usually the first thing to fail.
Drainage & Ponding
Water should be off the roof within 48 hours. Standing water accelerates membrane breakdown and adds serious weight to the structure.
Signs to Watch For

Does Your Commercial Roof Need Attention?

Flat roofs rarely fail overnight. If you are seeing any of these, book an inspection before the next storm makes it worse.
  • Water stains, drips or damp patches on ceilings
  • Standing water still on the roof 48 hours after rain
  • Blisters, ridges, splits or open seams in the membrane
  • Loose or lifting flashing at walls, curbs and skylights
  • Granule loss, exposed felt or bare bitumen
  • Blocked or slow drains and overflowing scuppers
  • A roof that is 15 or more years old with no recent work

Get a Free Commercial Roof Inspection

We will assess the roof, explain what we find and quote the work in writing. No pressure, no obligation.
Get a Free Quote
Call 647-405-3815
New flat roof installation with fresh cap sheet membrane
Free, No Obligation

Get Your Free Flat Roof Quote

Leave your details and we will call you back to book a free inspection. Commercial, industrial and residential flat roofs across Ontario.
Prefer to talk? Call 647-405-3815, answered 24/7.