Flat and low-slope roof repair in Winnipeg typically runs $400–$2,500 for most jobs, but that range varies a lot depending on the size of the roof, the type of membrane, how many layers need to come off, and what the substrate looks like once we open it up, so treat that number as a starting point, not a firm quote.
What Counts as a Flat or Low-Slope Roof
Winnipeg has more flat and low-slope roofs than most people realize. Commercial strip malls, apartment blocks, additions on older homes, garages with decking on top, and even some modern residential builds all use low-slope systems. If your roof has less than a 2:12 pitch (about 18 degrees), it's not shedding water the way a sloped shingle roof does. It's relying on membrane, flashing, and drainage to keep water out.
The most common systems we see across Winnipeg and the surrounding area:
- Modified bitumen (torch-down or self-adhered). the most common on commercial and residential flat roofs here
- EPDM rubber membrane, often on newer builds and re-roofs
- TPO/PVC single-ply, increasingly common on commercial properties
- Built-up roofing (tar and gravel). older buildings, still performing fine if maintained
- Asphalt shingles on a low slope, a problem waiting to happen, and we'll tell you straight if that's what you have
Each of these systems fails differently, and each gets repaired differently. That's why a flat-roof repair isn't a one-size-fits-all price.
What's Included in a Flat & Low-Slope Roof Repair
When we quote a flat or low-slope repair, what the work actually involves:
Inspection and leak tracing. We find the actual source of the water entry, not just the wet spot on your ceiling. Water travels along joists and under membranes before it drips, so the visible leak is rarely the real problem. We trace it back.
Membrane patching or section replacement. If the membrane has a puncture, a blister, or a seam failure, we patch it properly, or cut out the damaged section and weld in a new piece that matches the existing system. This is where a lot of cheap roofers cut corners, and it's why their repairs don't last a Winnipeg winter.
Flashing repair or replacement. Flashing is the metal or rubber transition where your roof meets a wall, a parapet, a vent pipe, or a skylight. On flat roofs, flashing failures cause more leaks than the membrane itself. We re-seal, re-flash, or replace as needed.
Drainage fixes. Flat roofs don't drain on their own. If your scuppers, roof drains, or internal drains are plugged or poorly pitched, water ponds and finds its way through. We clear, adjust, or re-pitch where it makes sense.
Seam and lap re-sealing. The seams between membrane sheets are the weakest points on any flat roof. We inspect every seam in the affected area and re-weld or re-seal any that are lifting.
Substrate repair. If the decking or insulation underneath the membrane is wet or rotted, we replace it before closing the roof back up. Skipping this step means your repair fails in a year and the rot spreads.
Ice dam and freeze-thaw response. Winnipeg's freeze-thaw cycle is brutal on flat roofs. Snow melts, water runs to the edge, freezes, and creates a dam that pushes water back under the membrane. We handle the immediate leak containment and the membrane work that stops it from happening again.
Flat & Low-Slope Roof Repair Pricing in Winnipeg
what we typically see for flat and low-slope repairs in Winnipeg. Every one of these ranges depends heavily on the size of the roof, the type of membrane, how many layers are involved, and what we find once we open things up, so use these as a planning guide, not a quote.
| Job Type | Typical Range | What Drives the Price |
|---|---|---|
| Small membrane patch (puncture, small tear) | $400–$900 | Size of patch, membrane type, access difficulty |
| Section replacement (5×5 ft up to 10×10 ft) | $800–$1,800 | How much membrane comes off, substrate condition |
| Flashing repair or replacement | $400–$1,200 | Number of penetrations, metal vs. rubber, parapet height |
| Seam re-sealing (multiple seams) | $500–$1,200 | Linear footage, how many layers need re-welding |
| Full re-coating of a small flat roof | $1,500–$2,500 | Roof square footage, coating type, prep work needed |
| Leak trace and repair on a complex roof | $900–$2,500 | Number of roof levels, how many penetrations, how hard the leak is to find |
The honest part: we can't give you a firm number over the phone, and any roofer who does is guessing. The final cost depends on the size of the job, the scope of the work, and the conditions on your specific roof. What we can promise is that the quote you get is the price you pay, we don't find "surprises" halfway through and jack up the bill.
One thing worth knowing: if your flat roof has hail damage from a May-to-September storm, your insurance claim may cover part or all of the repair. We provide an adjuster-ready damage report with every inspection, so you have documentation whether you file a claim or not.
Free on-site estimate · no obligation · (431) 813-6785
Our Flat Roof Repair Process
Book the inspection
Call us, and the person who answers is the person who'll be on your roof. We don't have a sales team, a call centre, or account managers. We schedule a time that works for you
We inspect and trace
We walk the roof, check every penetration, seam, and flashing detail, and trace the leak back to its source. For flat roofs, this often means checking the interior too, looking at joists, insulation, and ceiling stains to confirm the water path
You get a repair-first quote
We tell you what's wrong, what needs to happen to fix it, and what it'll cost. If a repair is smarter than a replacement, we say so. If your roof is beyond repair and needs a full replacement, we say that too, but we never sell you one you don't need
We do the repair
Small crew, no subcontractors, no one learning on your roof. We show up when we say we will and we do the work properly, the first time
We follow up
After the repair, we walk the roof again with you if you want, show you what we did, and make sure you know how to maintain it going forward
Why Choose Roof Repair Winnipeg for Flat Roof Work
We actually specialize in leak repair. Most Winnipeg roofers are replacement companies that do repairs as a side gig. We started with leak repair because that's where most roofers do their worst work, patch the ceiling, bill the insurance, and sell a replacement you didn't need. We find the actual source, fix it properly, and tell you honestly when a repair is smarter than a new roof and when it isn't.
Small crew, low overhead, fair pricing. We don't have a twelve-truck fleet, a showroom, or a sales team to pay for. That overhead shows up in other companies' prices. Ours doesn't have it.
The person who quotes is the person who repairs. No hand-off, no miscommunication, no "that's not what we quoted" games. You deal with one person from the first call to the final walkthrough.
Repair-first quotes. We quote the fix, not a replacement you don't need. If a $900 membrane repair buys you another eight years on a flat roof, that's what we recommend. We only push replacement when a repair doesn't make financial sense.
Winnipeg freeze-thaw experience. This city's climate is harder on flat roofs than almost anywhere else in Canada. We've worked every season Winnipeg has thrown at us, the May-to-September hail season, the January deep freezes, the March thaws that turn every flat roof into a skating rink. We know how these roofs fail here, and we know how to fix them so they last.
24–48 hour storm response. If your roof is actively leaking, we get to you fast. We contain the water damage first, then do the proper repair. That's the difference between a $900 fix and a $9,000 ceiling-and-insulation job.
When a Repair Isn't the Answer
We're honest about this: some flat roofs are past the point of repair. If your membrane is blistered across 40% of the roof, if the substrate is waterlogged and sagging, or if the roof has been patched so many times that there's more patch than original membrane, a repair is throwing money at a losing situation.
In those cases, we'll tell you a replacement is the smarter move, and we'll quote that honestly too. Our roof replacement price range is $8,000–$15,000 for most Winnipeg homes, though again, that varies with the size and scope of the job. But we only recommend replacement when a repair won't hold up. That's the difference between a repair-first company and a replacement mill.
Book Your Flat Roof Repair in Winnipeg
If your flat or low-slope roof is leaking, ponding water, or showing signs of membrane failure, don't wait, water damage gets more expensive every week you put it off. We serve all of Winnipeg and the surrounding communities, and we'll give you an honest, repair-first quote on what your roof actually needs. Call us or request your free quote online, and we'll get you on the schedule.