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North York Commercial & Institutional Flat Roofing
✓ Consumers Road · Don Mills · Duncan Mills · Downsview · ✓ Towers, plazas, schools and hospitals · ✓ Work over occupied floors · ✓ Commercial & industrial only since 1977
Flat Roofing North York: Commercial Roofing Where the Roof Is the Busiest Floor
Find out which curbs, pitch pockets and walkway routes are really costing you the roof, before anyone prices a new one.
★ Google rating: 4.8 | Founded 1977 · flat roofs for 50 years | Licensed · liability-insured · WSIB | Free inspection every spring and fall
Offices, Institutions and a Great Many Towers
North York's commercial roofs don't look like the ones out in the employment lands. The City's Official Plan names Consumers Next, Don Mills, Duncan Mills and Downsview as the employment areas here, and only some of that is what most people picture as industrial. Consumers Road is the clearest example — an office district of roughly a hundred hectares between Victoria Park, the 401, the 404 and Sheppard, with over eighteen thousand people working in it. When the City studied it in 2011 it counted around sixty buildings, ranging from one to eighteen storeys, with office employment accounting for more than ninety-five per cent of the jobs.
North York Centre is denser again. Close to nine million square feet of rentable office space, more than thirty-four thousand jobs, and the largest employment concentration anywhere outside downtown — sitting among apartment towers, because the most common land use in the Centre is residential.
Then Downsview, where a 5.4 square kilometre secondary plan came into force in 2024 with room for fifty-two thousand workers over the next thirty years.
Different buildings, one shared problem.
Three North York jobs sit in our project gallery, and the September 2025 one is still the newest thing on it.
“He took photos to show us where the leaks were coming from.”
Amanda Helps · Google review
4.8 on Google, too. That photo habit is the same one we bring up a tower roof — every penetration shot and filed, so you're never left just taking our word for it.
Most of What Goes Wrong Up There Was Done by a Person
Weather gets blamed for roof failure because weather is the thing everyone can see. On a North York office tower or a mid-rise institutional building, the weather is rarely the first cause. The first cause is usually foot traffic and other trades.
Think about what is actually on that roof. Rooftop package units and make-up air. Chillers and condensers. Exhaust fans over washrooms and kitchens. Telecom and cellular equipment, often leased to a carrier who sends their own installers. Elevator machine rooms and vents. Screens and davits. Every single one of those sits on a curb, and every curb is a hole cut in your membrane that somebody flashed.
Here's the problem. In a great many cases, the person who flashed it was not a roofer.
A mechanical contractor swaps a rooftop unit on a Tuesday. The unit is on the curb by the afternoon and running by the evening, because that is what the tenant is paying for. The flashing gets finished with whatever was on the truck — a bead of the wrong sealant, a patch of the wrong membrane, a piece of counterflashing screwed through the base. It sheds water for two or three seasons, then it doesn't. And because the water enters at the curb and moves sideways through the insulation, the ceiling stain appears over a desk on the floor below that has nothing to do with that unit.
Traffic is the other half. On a busy roof the service techs, the telecom crews and the window contractors all take the shortest line between the hatch and their equipment. Without walkway protection they take it across bare membrane, in winter, carrying tools. A single-sheet membrane that would have gone twenty-five years untouched loses its top surface along that path in a fraction of that. You can usually see the route from the air — a worn grey trail from the roof hatch to whatever needs a filter change every month.
Then the small stuff that nobody reports. Condensate lines discharging straight onto the membrane instead of into a drain, so one patch of roof is wet every day the air conditioning runs. Refrigerant lines resting directly on the sheet. Dropped screws walked flat. Anchors drilled for a fall-arrest line by a contractor who didn't know there was insulation under the deck plate.
None of this is dramatic and none of it appears in a maintenance report. It just quietly removes fifteen years from the life of a roof you paid for once.
What a Penetration Survey and Roof Assessment Turn Up
We survey these roofs penetration by penetration rather than field first, because on a tower roof the field is usually the healthiest part of it.
What comes back tends to cluster. Curb heights that were correct when the building opened and are now too low, because two inches of insulation went on in a later re-roof and nobody raised the curbs to match — so the base flashing sits closer to standing water every year. Pitch pockets that were filled once and have shrunk away from the pipe since. Counterflashing fastened through the membrane rather than into the wall. Telecom cable trays sitting on sleepers that were never flashed at all, just set down.
Where a leak is already live, we do not chase it from inside. Water entering at a curb can surface a long way from where it got in, so the ceiling tile tells you almost nothing. We run an infrared moisture survey after dark, when wet insulation still holds the day's heat and the dry field around it has let go, then cut cores to confirm the boundary before anyone quotes a square foot of anything.
The output is a map, not an opinion — which penetrations are sound, which need re-flashing, where the insulation is wet and how far it has travelled. On an occupied building that map is also a budget document, because it lets you fix the six curbs that matter this year instead of replacing a roof that has fifteen good years left in the field.
The Crown Curb-to-Hatch Survey: Four Steps Before Anyone Quotes
We run it the same way on every North York roof we're asked onto. And nothing gets priced until step three is on paper.
1. Walk every penetration
Curbs, pitch pockets, sleepers, cable trays, counterflashing. We start at the hatch and go unit by unit — the open field can wait, it's usually the healthy bit.
→ You learn which details are actually failing.
2. Scan it after dark, core the edges
Infrared once the sun is off the roof and the wet insulation is still holding heat. Then cores, to pin down where the wet actually stops.
→ You see the wet area instead of guessing from a ceiling tile.
3. Put it on a written map
Sound, needs re-flashing, wet, dry — each detail marked and photographed. Yours to keep whether you hire us or not.
→ Something you can budget from, this year and next.
4. Give you the straight answer
Most often that's re-flash the curbs and protect the routes. If the field really is gone, it's PVC or SBS, torn off to the deck.
→ You pay for the scope the evidence supports, nothing bolted on.
Re-flash, Protect the Routes, and Only Then Talk About Replacement
On most North York buildings the right first move is not a new roof.
It's re-flashing the penetrations that are failing, raising the curbs that are now too low, and getting the details right where equipment meets membrane. Where the transition is sealant-dependent, we use the right product for the substrate and the movement it has to take, which is a narrower question than it sounds — most premature joint failure we're called back to was caused by a general-purpose tube used on a joint that moves. Sealant and jointing around rooftop equipment is its own discipline and we treat it as one.
Then we protect the routes. Walkway pad from the hatch to every serviceable unit, laid along the line people already walk rather than the line a drawing says they should. Target sheets under condensate discharge and anywhere a line drips. Sleepers and supports properly flashed instead of resting on the sheet. None of that is expensive and all of it buys years.
Replacement comes when the field is genuinely gone, and then the system matters. On a tower or podium roof with heavy equipment and constant service traffic, single-ply PVC is usually the call — dimensionally stable, welds into a continuous sheet, and detailing around a crowded roof is cleaner in PVC than in anything else we lay. Ours carries material warranties up to twenty years. Where the deck is concrete and traffic is heavy enough that we want a second layer under the first, SBS modified bitumen is the better answer, and we install that too.
One rule doesn't change on any building: every replacement is a tear-off to deck. We don't leave an old assembly in place, and on a roof with this many penetrations, burying old flashings under a new membrane is how you inherit a leak nobody can ever find.
Between visits, the cheapest thing you can do is look at it twice a year. A spring and fall inspection catches a shrinking pitch pocket while it is still a tube of sealant rather than a wet bay.
Flat Roof Repairs, and When Replacement Wins
Most of the calls we take from North York are for a flat roof repair rather than a new assembly, and most of the time that is the correct instinct.
A tower or podium deck that has been maintained has a sound field. What fails is the detail work around the equipment, and a repair aimed at the right detail is cheap next to anything else. The trap is aiming it at the wrong one. Water entering at a curb travels sideways through the insulation and shows up over a desk twenty metres away, so a repair booked off the ceiling stain is a repair in the wrong postcode. We scan first, core the boundary, then price.
Roof replacement earns its place when the field itself has gone wet across a wide area, when the same detail has been rebuilt three times, or when the assembly was built without a way of keeping water out of the insulation in the first place. That is a judgement about evidence, not about the age on a drawing, and we will show you the evidence either way.
What that means in practice on an occupied building is that a free assessment is worth more than a free quote. A quote tells you what one company would charge for one scope. An assessment tells you whether that scope is the right one — and on a roof carrying this much plant, those are very different documents.
Between the two sits the thing that actually saves money: a maintenance programme. Two visits a year, every penetration photographed, drains cleared, walkway pad kept where the traffic is. A building on that programme spends less across twenty years than a building that waits for a leak, and it is not close.
If something is coming in now, that is an emergency and it gets treated as one. The first visit stops water reaching the tenancy. The diagnosis follows in daylight.
For budgeting, it helps to know roughly where the money goes on an assembly of this kind. The open field is the cheap part of it. The expensive part is everything that interrupts it — curbs, pitch pockets, a skylight kerb, the transitions at a screen wall — which is why two buildings of the same square footage can be a long way apart on a roof replacement price. A dense equipment deck here can cost more than a clean warehouse twice its size, and the free assessment is what tells you which one you have before anyone in Ontario quotes you a number.
Two Things North York Managers Ask Before They Pick Up the Phone
“Is this going to end with you selling me a new roof?”
Probably not. On these buildings the trouble is usually a handful of curbs, and the assessment costs you nothing, so there's no sale riding on the first visit. If replacement does turn out to be the answer, the map will show you why — in writing, with the photos.
“We already have a roofer on a service contract.”
That's fine, keep them. The assessment is still free and the map is still yours, so you can lay it next to what your current programme is catching and see if anything's slipping past.
Commercial Flat Roofing Only: What We Do and Don't
It is worth setting out the shape of the company, because it is narrower than most of the firms bidding your building.
Crown is a commercial and industrial flat roofing contractor based in Toronto. Survey and infrared scanning, repair, planned maintenance, tear-off and full replacement, and new project work alongside a general contractor. Offices, institutions, plants, warehouses and the podium decks under apartment towers. Low-slope only.
What sits outside that: we do not do residential roofing, we do not fit shingles, we do not do siding or eavestrough, and we do not supply skylight units. A skylight already on your roof is a different matter — the curb and the flashing around a skylight is roofing and it is ours, and a leaking skylight curb is one of the commonest things we are called to on a North York office building. We do not install TPO or EPDM either, though we maintain both where a building already carries one.
No part of the job is subcontracted. The crew is on our payroll, carries our Ontario coverage, and comes back for the inspections. On a building with a sign-in procedure and tenants who notice everything, that continuity is worth more than a lower number from a broker.
The trade-off is real: if your property needs four trades, we are one of four calls. What you get in return is a firm that has done this and nothing else since 1977, from one yard, across Toronto and the rest of the GTA.
The Most Recent Job on Our Board Is in North York
We have been at this since 1977 and have never done anything else — commercial and industrial flat roofs, fifty years of them, no houses, no siding, no subcontracted crews. Brian Sharp started the firm. Joe Ferrier is President today.
North York is one of the places we are busiest. There are three separate North York jobs posted in our gallery, and the September 2025 entry is the most recent job on the whole board — ahead of every other city on it. Two more from 2024 sit alongside it.
See the North York work for yourself. The photographs are taken on the roof by the crew, which is why they look like job pictures rather than advertising. If one of them is close to your building, say so when you call and we will arrange to take you up on a roof you can actually stand on before you decide anything.
What Building Owners Have Said About Us
Our business in Aurora had several leaks in the roof to our shop. Crown Roofing was amazing to deal with. Their worker Arvin was such a great guy and was really thorough in explaining where all the leaks were. He took photos to show us where the leaks were coming from. They also found a forth leak and fixed it in good faith without billing us. I can not express just how much we loved working with Arvin.
Amanda Helps · Google review
I waited for all seasons before giving this review as I wanted to give a transparent and accurate review. I received multiple quotes and decided to use them to replace the roof on our building.
Susan Mahabir · Google review
Rated 4.8 on Google.
Occupied Buildings, Other Trades, and Roofs Full of Equipment
Can you re-roof while the building is occupied?
Yes, and on most North York buildings that's the only version of the job available — a tower full of tenants doesn't empty out for a roof. We stage in bays and keep the open tear-off face no larger than we can close the same day, so there is never an uncovered deck overnight. Anything that carries odour goes on the schedule against your make-up air intakes rather than against ours, which usually means kettle operations and adhesives happen outside business hours or on a weekend. Where we're above a daycare, a clinic or a food operation we walk the sequence with the building manager before we mobilise, not after.
Our HVAC contractor flashed the new rooftop unit. Is that actually a problem?
Often, yes — and it's worth checking rather than assuming. Mechanical contractors are good at what they do; membrane termination is a different trade with different materials, and a unit that is running perfectly can still be sitting on a detail that will let water in by the third winter. The failure mode is slow and it is invisible from inside until the insulation under it is already wet. We're happy to inspect recent equipment installs as a standalone visit. If the flashing is sound we'll tell you it's sound, and that is a perfectly common outcome.
Our roof is covered in equipment. Does that change which system you'd put on it?
It changes it considerably. A crowded roof is mostly detail work rather than open field, so we weight the choice toward the membrane that details cleanly and welds into a continuous sheet — which on a busy tower roof usually points at PVC. It also changes the layout: walkway routing, where target sheets go, how curbs get raised, and whether some of the smaller units are better relocated or consolidated while the roof is open. That's a conversation worth having before the spec is written, because moving a curb costs very little during a tear-off and a great deal afterwards.
Something is leaking now and there are tenants underneath. How fast can you get here?
Quickly, and there is someone on the line at any hour rather than an answering service that takes a message until Monday. The immediate job on an occupied building is to stop water reaching the space and protect what's below it, which is usually a temporary containment and a watertight repair the same visit — not a diagnosis. The diagnosis follows in daylight, with a scan, because a leak found in a panic at two in the morning is found at the ceiling, and the ceiling is almost never where the roof failed.
Call Us and Find Out Which Six Details Are Costing You the Roof
If your building has a roof full of equipment and a leak history nobody has ever mapped, the useful next step isn't a replacement quote. It's a survey of every penetration on it and a thermal scan of the field, so you can see what is actually failing and what is fine.
Call (416) 744-7788 or email info@crownroofing.ca. We will go up, make our way around it, and give you a written map of what needs doing this year and what can wait.
The assessment is free and the map is yours whether or not you use us. We cover the borough from Consumers Road and Don Mills through the Centre to Downsview, and the rest of Toronto and the GTA from the same yard — a flat roof repair on a Tuesday, a scheduled roof replacement three years out, or an emergency at two in the morning when a skylight curb lets go over a boardroom. Same crew, same people, since 1977. Ask for the assessment first — in Toronto it is the cheapest hour anyone will spend on the building all year.
One practical note for property managers running several sites across Toronto and the wider GTA: we will survey the portfolio together and give you one schedule rather than separate arguments each spring. That is usually where an emergency turns into a plan, and where a plan turns into a smaller bill than the emergency would have been.
Crown Industrial Roofing · 227 Queens Plate Dr Unit #3, Etobicoke, ON M9W 6Z7
What you can hold us to.
We're a licensed contractor with comprehensive general liability cover and WSIB in place, and every crew member's safety certification is current. Want the certificates? Ask, and they're yours. You get manufacturer-backed warranties on materials and a workmanship warranty of up to 15 years from us — both documents, written, at the final walk-round of the finished roof. And the spring and fall inspection is free.