Commercial & Industrial Roofing

Industrial Roofing in Toronto & the GTA

Factory and warehouse roofs are measured in acres, not squares, and the stakes underneath them are production lines, racking and inventory that cannot get wet. When plant managers go looking for an industrial roof contractor, the questions are practical: can you work over a live operation, can you handle the roof's scale, and can you give us a plan that fits a maintenance budget instead of an ultimatum. Those are the right questions.

Industrial roofs in the Golden Horseshoe are mostly two families: flat membrane systems over steel deck, and metal building roofs β€” screw-down or standing seam panels on purlins. Each fails its own way. Membranes give out at seams, drains and around rooftop equipment; a metal building roof leaks at fastener holes, end laps and rusted panels long before the panels themselves are done. Snow load, freeze-thaw and the constant vibration of plant equipment all speed the process along.

We quote industrial work with a safety plan attached, because on a factory roofing job the fall protection, hot-work permits and coordination with your operation are half the project. The quote itself separates what must happen now from what can wait a season β€” a fastener-and-seam programme on a metal roof, or targeted membrane work, often carries a building for years at a fraction of replacement. When the roof genuinely is done, the numbers make the case on their own.

What this covers

  • Condition assessment of large-span membrane and metal building roofs, with photo documentation
  • Membrane repair and replacement over steel deck β€” TPO, EPDM and modified bitumen
  • Metal roof work: fastener replacement, end-lap sealing, rust treatment and panel replacement
  • Retrofit systems over failing metal roofs, including insulated recover options
  • Flashing and curb work around rooftop units, exhaust stacks, conveyors and skylights
  • Drainage corrections β€” internal drains, scuppers and gutter systems sized for big roof areas
  • Site-specific safety plan: fall protection, hot-work procedures and coordination with plant operations
  • Phased scheduling around production shifts, shutdown windows and loading operations

What affects the price

  • Sheer roof area β€” industrial jobs are priced on scale, and mobilization spreads differently over 20,000 square feet than 200,000
  • Roof type: membrane over steel deck versus a screw-down or standing seam metal building roof
  • Condition of the steel deck or purlins once the roof is opened up
  • Density of rooftop equipment, stacks and process penetrations that need detailing
  • Whether work can proceed over a live operation or must wait for shutdown windows
  • Height, access and staging space for material handling and cranes
  • Interior sensitivity β€” food-grade plants and clean environments need stricter dust and odour control

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

Common questions

Can industrial roofing work happen while the plant keeps running?
Usually, yes β€” most of our industrial work happens over live operations. It takes planning: sectioning the roof, scheduling noisy tear-off away from sensitive shifts, managing odour at air intakes, and agreeing on no-go zones above critical equipment. Some clients reserve the riskiest sections for planned shutdown weeks. A workable phasing plan is part of the quote, not an afterthought.
Our metal building roof leaks at hundreds of screws. Does it need replacing?
Often not. Fastener leaks are the classic ailment of screw-down metal roofs β€” the rubber washers age and the holes wallow out with thermal movement. A systematic programme of oversized replacement fasteners plus end-lap and seam sealing can buy a structurally sound roof many more years. Replacement or a retrofit membrane over the metal becomes the answer when panels themselves are rusted through.
How does snow load affect a large industrial roof in Ontario?
Big flat roofs collect drifts against parapets, rooftop units and at roof-level changes, and that is where OBC snow-load design gets tested. Blocked drains make it worse by adding ice to the weight. If you see new deck deflection, doors binding, or ponding lines after thaw, have it looked at. Drift zones are also where membranes get the most abuse from ice.
What is the most cost-effective fix for an aging factory roof?
Rarely full replacement, at least not immediately. A moisture survey splits the roof into what is wet and what is dry; wet sections get replaced or repaired, dry sections get maintained or coated. Spread over a few budget years, that programme typically costs well under a wholesale tear-off and keeps capital available for the plant itself. Replacement is the answer when the survey says most of the roof is already saturated.
Do industrial roof projects need permits or engineering?
Like-for-like roof replacement generally proceeds without a building permit, but industrial jobs trip engineering requirements more often than other buildings: adding rooftop equipment, changing roof loads with a recover system, or altering structure all bring in the OBC and usually a structural engineer's review. We flag what applies during the assessment so approvals never stall the schedule.

Ready to sort out your industrial roofing?

Tell us what your home needs β€” a small fix or a full project β€” and get a free quote.