Flat roof repair and installation across the former City of York
York Flat Roof Repair, Installation, and Replacement
We install, replace and repair flat roofs across York. Free no-obligation quotes, warrantied workmanship and a 24/7 line for anything that cannot wait.
What you get from Flat Roofs Toronto
24/7 Emergency Response
Leaks do not wait for business hours.
Free No-Obligation Quotes
Scope, system and number, in writing, first.
Manufacturer & Workmanship Warranties
The materials and the installation are both covered.
Flat Roofs Only
Low-slope work is the whole business, not a sideline.
Flat Roofing Across York
The former City of York, running roughly from St Clair West up through Eglinton West to Weston and Mount Dennis, is one of the older parts of Toronto and its roofs show it. The housing is mostly pre war and wartime brick: semis, narrow detached houses and duplexes, many with flat roofed rear additions, back kitchens and small garages off a lane or driveway. Along St Clair West, Eglinton West, Rogers Road and Weston Road the commercial buildings are two and three storey mixed use blocks with retail below and apartments above, all sitting on low slope roofs behind a parapet. Older industrial parcels along the rail corridor and the Humber add larger membrane roofs. Much of this stock has been reroofed several times, so tear off condition is often the deciding factor.
Why Flat Roofs Are Everywhere in York
- Pre war and wartime houses across York carry flat roofed rear additions, back kitchens and small garages that need regular membrane renewal.
- The mixed use retail blocks along St Clair West, Eglinton West, Rogers Road and Weston Road are all low slope roofs behind parapet walls.
- Older industrial and warehouse buildings near the rail corridor and the Humber have large low slope roofs, often with multiple layers of old built up assembly.
Residential and Commercial Flat Roofing in York
Two different kinds of roof, two different ways of working. Both are everyday work for these crews.
Residential
Homes and Additions in York
York houses are close together and often on narrow lots, so the flat sections are small and the flashing details matter more than the field area. We rebuild parapet and party wall flashing between attached houses, replace membrane on rear additions and back kitchens, and correct decks that have sagged toward the middle rather than the drainage edge. Where several old layers exist we tear off fully rather than adding another, since weight and trapped moisture both cause problems on this stock.
Commercial
Commercial Buildings in York
Commercial low slope work in York is mostly two and three storey mixed use blocks and older industrial buildings. These roofs sit behind parapets with scupper or internal drainage, and the parapet is usually where they fail. We rebuild parapet caps and flashing, replace failed built up and modified bitumen fields with single ply or new torch applied systems, and rebuild drains. Tenants below are often residential, so leaks are urgent and 24/7 emergency flat roof repair is available.
Flat Roofing Services in York
Everything we do sits on a low-slope roof. Residential first, commercial second, and one number for an emergency at any hour.
Residential
Residential Flat Roofing
Rear additions, garages and row house decks. Tear-off to sound deck, new two-ply or single-ply membrane, and rebuilt flashing where the flat section meets the slope.
Replacement
Flat Roof Replacement
Core samples first, then a full tear-off, dry insulation, corrected slope and a new membrane, quoted in writing before anything comes off.
24/7
24/7 Emergency Flat Roof Repair
Active leaks, storm damage and open seams, answered around the clock. We stop the water first, then come back and fix the cause properly.
Daylight
Residential Flat Roof Skylights
Curb-mounted units framed into the deck, flashed by roofers and tied back into the membrane, plus replacements where the glazing has fogged.
Commercial
Commercial Flat Roof Installation
TPO, PVC, EPDM and modified bitumen on commercial and industrial low-slope roofs, phased so the building keeps operating.
Commercial
Commercial Flat Roof Skylights
Domes, barrel vaults and glass units, curbed and flashed by roofers, plus smoke vents and roof hatches surveyed in the same visit.
Residential
Attic Insulation and Ventilation
The cavity under the deck, to an R-50 to R-60 target where the depth allows it, with the venting strategy settled rather than left half of each.
Guide
Compare Every System
Six systems compared on lifespan, seams, fire behaviour, cost tier and the deck each one suits, so the quote you get is one you can read.
Flat Roof Systems We Install in York
Every flat roof in York gets the membrane that suits it rather than the one on the truck. Here is what we install and where each one earns its place. Compare every system side by side.
Two Ply
Modified Bitumen
Torch-applied or self-adhered SBS in two plies, with a granule-surfaced cap. The default on Toronto houses because it handles tight perimeters, curbs and wall terminations without a wide sheet.
- 15 to 20 year service life
- Redundant second ply
- Repairs patch cleanly
Torch Free
Cold-Ply
The same two-ply build assembled in cold adhesive rather than with an open flame. It is what we specify over occupied buildings, beside vinyl siding and anywhere a torch is not welcome.
- No open flame on the roof
- Low odour on occupied buildings
- Granule-surfaced cap
Single Ply
TPO and PVC
Hot-air welded thermoplastic sheet, laid in wide rolls with far fewer seams. It suits large commercial fields, and the reflective white surface keeps a warehouse roof cooler through a Toronto summer.
- Welded rather than glued seams
- Reflective white surface
- Fast over large areas
Rubber
EPDM
A synthetic rubber membrane that stays flexible through freeze thaw movement and takes ponding better than most. Common on garages, additions and small commercial decks.
- Flexible in cold weather
- Tolerates standing water
- Simple to detail and repair
Where We Work in York
The plan opens on York. Every borough and every GTA region we cover is on it.
Select a region on the plan
Areas we serve in York: Beechborough-Greenbrook, Briar Hill-Belgravia, Brookhaven-Amesbury, Caledonia-Fairbank, Corso Italia-Davenport, Humewood-Cedarvale, Keelesdale-Eglinton West, Lambton Baby Point, Mount Dennis, Oakwood Village, Rockcliffe-Smythe, Weston, Weston-Pelham Park.
Not listed? Call and ask. If we work the street next to yours we work yours.
What We Watch For on a York Flat Roof
The conditions that decide how long a roof here lasts, and what we detail differently because of them.
- Parapet walls on York mixed use blocks take the worst of the freeze thaw cycle, and failed parapet flashing is the leading leak source on those buildings.
- Multiple layers of old roofing on this older stock add weight and hide wet insulation, so full tear off is usually the right call.
- Attached and near attached houses mean shared flashing conditions where one neighbour's failing detail can leak into the next roof.
- Mature trees along the older residential streets drop debris into small rear roof drains and scuppers, causing ponding on additions.
Recent Flat Roofing Projects
Real jobs photographed on site across Toronto and the GTA. Our projects are not tagged to a single area, so these are the most recent rather than the nearest.
Lumbered Slope Build and Two-Ply System, Toronto
A lumbered slope framed over a flat roof deck to move water toward the drains, with a two-ply system installed over it.
Flat Roof Application Detail, Toronto
A detail from a flat roof membrane application, showing the finished surface of the system.
Attic Inspection and Blown-In Insulation, Toronto
Inspection of a flat roof attic space followed by blown-in insulation. The cavity is checked before any insulation is added.
Flat Roofing Advice for York
Membranes, drainage, insulation and what this climate does to a low-slope roof.
Flat Roofing in Richmond Hill: Best Systems for 2026
A practical 2026 guide to flat roofing in Richmond Hill: best membrane systems, real installed costs, Ontario Building Code insulation and drainage rules.
Commercial Flat Roofing in Markham: 2026 Guide
Commercial flat roofing in Markham: 2026 costs, membrane systems, drainage and Ontario Building Code rules, permits and maintenance for GTA building owners.
Commercial Flat Roofing in Vaughan: An Owner Guide
Commercial flat roofing Vaughan guide: 2026 costs, TPO, EPDM and modified bitumen options, drainage, permits and maintenance for York Region building owners.
Flat Roofing Questions From York
The questions we are asked most often on roofs in this part of the city.
Do you repair parapet flashing on York commercial buildings?
Yes. Parapet flashing is the most common failure point on the mixed use retail blocks across York. Freeze thaw movement cracks the cap and opens the joint between the parapet and the roof membrane, and water then travels down inside the wall. We rebuild the flashing and cap detail as part of a repair or a full roof replacement rather than sealing over it.
My York house has three layers of old flat roofing. Do they all come off?
In most cases yes. Older houses in York have often been reroofed two or three times, and each layer adds weight and traps moisture that you cannot see from the surface. A full tear off lets us check the deck, replace wet sheathing and start the new membrane on a sound base. It costs more up front and it is what makes the new roof last.
Do you install flat roofs on rear additions in York?
Yes. Rear additions and back kitchens on the older houses in York are a large part of our residential work. These are small roofs with important details: the wall transition to the main house, the flashing at the neighbouring property and the drainage edge. We tear off to the deck, correct the fall and install a modified bitumen or EPDM system suited to the size.
Can you work on a flat roof over occupied apartments in York?
Yes. Many of the mixed use buildings in York have apartments above retail, so we plan the work in sections and keep the roof watertight at the end of each working day. Tear off is staged to match what we can complete and seal, which protects the residents below. We also provide 24/7 emergency flat roof repair when a leak is already active.
How long will a new flat roof last in York?
A properly installed and correctly drained flat roof in York should give roughly a 20 to 30 year service life. What shortens it is standing water, blocked scuppers and neglected parapet flashing, all of which are common on this older stock. We provide manufacturer and workmanship warranties on installations and recommend an annual look at the drains and flashing.
Free, No Obligation
Request a Free Quote in York
Tell us what the roof is doing and we will come and look at it. No charge, and no obligation to proceed.
Call Us
Office Hours
Open 7 days a week: 7:00am to 11:30pm
Emergencies
The line above is answered 24/7 for anything that cannot wait, including weekends and statutory holidays.
Google Reviews
Reviews From York
These come straight from our Google Business Profile. We cannot edit them, reorder them or take one down, and the rating in the header is whatever Google is showing today.
Free, No Obligation
Get a Free Flat Roof Quote in York
Call Flat Roofs Toronto at (647) 333-3528 for a free no obligation quote on your York flat roof.