Flat Roof Questions — Edmonton
Real answers to the questions Edmonton commercial property owners ask us about flat roofs — costs, systems, ponding, winter leaks, infrared scans and maintenance. No sales pitch, just what twenty years on commercial roofs has taught us.
Cost questions
How much does a commercial flat roof cost in Edmonton?
A full commercial flat roof replacement in Edmonton typically falls between $8 and $17 per square foot installed, depending on the system, the deck condition, insulation needs, and how complex the roof is. A simple 10,000 sq ft warehouse with a clean deck costs far less per foot than a 3,000 sq ft restaurant with a dozen penetrations and poor drainage. We never quote from the parking lot — every estimate starts with an on-roof inspection and an infrared scan, so the price reflects what your building actually needs. Call 780-405-4440 for a free inspection.
What does SBS torch-on roofing cost per square foot?
Installed SBS 2-ply torch-on roofing in the Edmonton area runs roughly $10.50 to $16.00 per square foot in Canadian dollars. The range reflects deck preparation, insulation thickness, the number of plies, flashing complexity, and access. SBS is the workhorse of Alberta flat roofs — torch-welded seams, multi-ply redundancy, and strong puncture resistance. It costs more than single-ply options but many owners choose it for the redundancy: damage to one ply does not mean a leak. See our SBS torch-on roofing page for details.
What does TPO roofing cost per square foot?
Installed TPO roofing in Edmonton runs roughly $8.50 to $13.50 per square foot in Canadian dollars. TPO is a single-ply thermoplastic with heat-welded seams and a reflective white surface. The price varies with insulation requirements, deck condition, and how many penetrations need custom flashing. TPO suits owners who want a clean, light-colored membrane with welded seams. As with every system we install, we scan with infrared before any work and photo-document the existing conditions. See our TPO roofing page.
What does EPDM roofing cost per square foot?
Installed EPDM roofing in Edmonton runs roughly $8.00 to $13.00 per square foot in Canadian dollars. EPDM is a single-ply synthetic rubber that arrives in wide sheets, so large roofs go down fast with few seams — and fewer seams means fewer places to fail. It is a sensible fit for big, simple, low-slope roofs where speed and seam count matter most. We will be straight with you about where EPDM fits and where it does not: Alberta freeze-thaw is hard on every roof, and detailing at edges and penetrations matters more than the membrane brand. See our EPDM roofing page.
What does BUR roofing cost per square foot?
Installed built-up roofing (BUR) in Edmonton runs roughly $11.00 to $17.00 per square foot in Canadian dollars. BUR is built in place from alternating plies of bitumen and reinforcing felt — typically three or four plies — finished with gravel or a cap sheet. It costs more because it is labor-intensive and uses more material, but you get genuine multi-ply redundancy. BUR suits buildings where that redundancy is the priority, or roofs with heavy foot traffic. See our BUR roofing page.
What affects the cost of a commercial flat roof?
Five things move the price most: the system you choose (single-ply costs less than multi-ply), the condition of the existing deck and whether wet insulation must be removed, insulation thickness required, the number of penetrations, curbs and flashing details, and access — crane time, staging and how materials get to the roof. That is why phone quotes are fiction. Our process is an on-roof inspection with an infrared scan, photo documentation, and then a written estimate tied to what we actually found. If the roof does not need replacing, we say so.
Ponding water
What does ponding water do to a flat roof?
Standing water accelerates membrane breakdown, adds structural load, and feeds the freeze-thaw cycle that opens seams and cracks flashing. In summer it bakes contaminants into the membrane; in winter it freezes, expands, and works into every weak point. Ponding also voids many manufacturer warranties. That is why our rule is simple: standing water past 48 hours is an action item, not a wait-and-see. We check drainage on every visit — Roof Watcher members get it as part of every scheduled inspection.
How long can water sit on a flat roof?
Our standard is 48 hours. If water is still standing two days after rain or melt, something is wrong — blocked drains, settled insulation, structural deflection, or a design issue. Short of 48 hours on a healthy roof is normal; past it, you need a plan. We document ponding areas with photos during every inspection and infrared scan, and we treat persistent ponding as an action item with a written recommendation, whether that is clearing drains, adding tapered insulation, or reworking the drainage layout.
Winter, leaks and emergency
What should I do about a roof leak in winter?
Call 780-405-4440 — we dispatch 24/7, including winter. Inside, contain the water with buckets and move anything valuable. Do not send your own staff onto an icy roof. Winter leaks usually trace to flashing failures, ice dams at edges, or membrane splits from freeze-thaw movement. We diagnose with infrared where conditions allow, make a watertight temporary repair to stop the damage, and then plan the permanent fix. Document everything with photos for your records.
Can you repair a flat roof in cold weather?
Yes — emergency repairs happen year-round. Cold limits some options: adhesives and mastics need minimum temperatures to cure, and torch work needs the right conditions. But stopping active water entry is almost always possible with temporary membranes, mechanical patches, or heat-assisted methods. We will tell you honestly what is a proper cold-weather fix and what should wait for spring, and we put it in writing. For active leaks right now, call 780-405-4440 any time.
How does freeze-thaw damage flat roofs?
Water gets into tiny openings — a pinhole, a stressed seam, a hairline flashing crack — then freezes and expands by about nine percent. Each cycle wedges the opening wider. Over an Edmonton winter with dozens of freeze-thaw cycles, small defects become leaks. This is why fall inspections matter: we find and seal the small stuff before winter turns it into emergency calls. Our infrared inspections find trapped moisture before freeze-thaw weaponizes it.
Should I remove snow from my flat roof?
Usually not by yourself — shovels and snowblowers damage membranes, and foot traffic on a snow-covered roof is dangerous. But excessive snow load is real: wet spring snow is heavy, and drifting creates uneven loads. If you are concerned about load, or if meltwater is ponding against snowbanks and backing up under flashing, call us. We clear problem areas safely and check that drains are open so meltwater can actually leave the roof. That is part of what Roof Watcher covers.
Do you offer 24/7 emergency roof repair in Edmonton?
Yes. Water coming in right now is an emergency, and we dispatch 24/7 across Edmonton and the surrounding area — nights, weekends, holidays, winter storms. Call 780-405-4440. We stop the water entry first with a watertight temporary repair, document everything with photos, and then give you a straight assessment of the permanent fix. No one should be waiting until Monday with water pouring into their building. See Flat Roof Repair Edmonton.
Infrared scans
What does an infrared roof scan find?
An infrared scan finds trapped moisture inside the roof assembly — water that has gotten under the membrane and soaked into the insulation or deck, invisible from the surface. Wet areas hold heat differently than dry areas, so after sunset they show up as distinct thermal patterns. The scan maps exactly where moisture is trapped, which tells us what can be repaired and what must be replaced. It is the difference between guessing and knowing, and it is why we scan before any work on every visit. See Infrared Inspection.
When do you do infrared scans?
Before any work, on every visit — that is our rule. Whether you call us for a leak, an estimate, or a Roof Watcher maintenance visit, the infrared scan comes first. Scanning first means we find trapped moisture before we quote, so the scope and price reflect reality. It also means we can sometimes save you from a full replacement: if the scan shows moisture is localized, a targeted repair may be all you need. No scan, no quote — that is the policy.
What does an infrared scan cost?
A standalone infrared inspection is quoted per roof based on size and complexity — call 780-405-4440 for a price. But within the Roof Watcher maintenance program, infrared scans are included in every tier: Essential ($2,000/yr + GST) includes an annual scan, Professional ($4,000/yr + GST) adds a second seasonal scan, and Premium Platinum ($6,500/yr + GST) includes quarterly scans. For program members, the scan is not an extra — it is the foundation of every visit.
Maintenance and Roof Watcher
How much does commercial roof maintenance cost in Edmonton?
Our Roof Watcher program publishes its prices — something almost no Edmonton competitor does. Essential is $2,000 per roof per year plus GST: annual inspection with infrared scan, documented condition report with photo evidence. Professional is $4,000 per roof per year plus GST: two inspections, priority repair scheduling, budget forecasting. Premium Platinum is $6,500 per roof per year plus GST: quarterly inspections, 24/7 emergency priority, full roof history file. Repairs are quoted separately in all tiers.
What is the Roof Watcher program?
Roof Watcher is our scheduled maintenance program for commercial flat roofs. Instead of reacting to leaks, you get ahead of them: regular inspections, infrared moisture checks before any work, documented condition reports with photo evidence, and budget forecasting so you plan capital years ahead. Three tiers — Essential $2,000/yr, Professional $4,000/yr, Premium Platinum $6,500/yr, all plus GST per roof — with repairs quoted separately. Standing water past 48 hours is an action item on every visit. See Roof Watcher.
How often should I inspect my commercial flat roof?
At minimum, twice a year — spring and fall. Spring catches winter damage before it becomes summer leaks; fall seals the small stuff before freeze-thaw weaponizes it. Roofs with heavy equipment, high foot traffic, or known drainage issues need more frequent checks. Our Roof Watcher tiers match this reality: Essential gives you one annual inspection, Professional gives you two seasonal visits, Premium Platinum gives you quarterly. Every visit includes an infrared scan and photo documentation.
What is included in a roof condition report?
Our documented roof condition reports include dated photos of every issue found, infrared scan images showing trapped moisture, a plain-language assessment of each deficiency, prioritized recommendations with budget implications, and a ponding and drainage assessment — standing water past 48 hours is flagged as an action item. You get evidence you can take to your board, your capital planner, or your insurer. Reports are included in every Roof Watcher visit and every pre-work inspection.
Roofing systems
SBS vs EPDM vs TPO — which is best for my building?
There is no universal winner — only the right system for your building. SBS torch-on gives you multi-ply redundancy and excellent puncture resistance, at a higher installed cost ($10.50–$16.00/sq ft). EPDM ($8.00–$13.00/sq ft) goes down fast in wide sheets with few seams, a good fit for large simple roofs. TPO ($8.50–$13.50/sq ft) offers heat-welded seams and a reflective surface. BUR ($11.00–$17.00/sq ft) is the traditional multi-ply built-up system. We assess your deck, drainage, traffic and budget — with an infrared scan — and recommend the system that fits, not the one with the best margin.
How long does a flat roof last in Alberta?
It depends on the system, the installation quality, and — most of all — whether anyone maintains it. A well-installed commercial flat roof that gets regular inspections, prompt repairs, and drainage kept clear can serve for decades; a neglected one can fail in under ten years regardless of the membrane. Alberta’s freeze-thaw cycles punish small defects, so the roofs that last are the ones that get looked at. That is the entire premise of Roof Watcher: scheduled inspections, infrared moisture checks, and documented reports that catch small problems before they become capital events.
Repair vs replace — how do I decide?
The honest answer starts with an infrared scan. If moisture is localized and the membrane is otherwise sound, targeted repairs are the smart money. If the scan shows widespread trapped moisture, failed seams across large areas, or a deck that is compromised, replacement is cheaper than chasing leaks for years. We show you the scan images and photos, give you both options with real numbers, and tell you what we would do if it were our building. If the roof does not need replacing, we say so — and prove it with pictures. See Flat Roof Repair Edmonton.
How long do flat roof repairs take?
Most targeted repairs — flashing rebuilds, membrane patches, drain clearing — are done in a day once we are on the roof. Larger sectional repairs can take two to three days. Emergency calls get a watertight temporary repair on the first visit, usually within hours of your call, with the permanent fix scheduled after. Every repair starts with an infrared scan so we fix the actual problem, not just the symptom you can see from inside. Call 780-405-4440 for 24/7 dispatch.
Where does EPDM fit? (An honest answer)
EPDM is a single-ply synthetic rubber membrane that comes in wide sheets — big roofs go down fast with few seams, and repairs are straightforward. It fits large, simple, low-slope commercial roofs where speed of install and minimal seams matter most. What we will not tell you is that any membrane is “built for Edmonton winters” — freeze-thaw is hard on every roof system, and long-term performance comes down to installation quality, detailing at edges and penetrations, drainage, and maintenance. We install EPDM where it genuinely fits and tell you plainly where it does not. See our EPDM roofing page.
Still have questions?
Call 780-405-4440 or request a free inspection — every visit starts with an infrared scan before any work. Learn about our commercial roofing services, Roof Watcher maintenance, and 24/7 emergency repair.