A lumbered slope framed over a flat roof deck to move water toward the drains, with a two-ply system installed over it.
Lumbered Slope Build and Two-Ply System, Toronto
Open Lumbered Slope Build and Two-Ply System, Toronto
Flat roofing in Markham, York Region
Markham Flat Roof Repair, Installation, and Replacement
Low-slope roofing for Markham in York Region: leak tracing, tear-offs, new membrane and rebuilt flashing, quoted in writing before anything comes off.
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.
The Flat Roofs of Markham
Two roof economies sit side by side in Markham. The corporate and technology employment lands carry large office and campus buildings with wide low slope fields, screened mechanical, interior drains and rooftop access directly over occupied floor plates. The residential side is newer subdivision housing where flat roofing is confined to garage decks, entry porticos, rear additions and a growing number of modern flat roofed custom homes. Along the Highway 7 corridor, mid rise and mixed use stock adds podium roofs, terraces and amenity decks. Age ties all of it together: a great deal of that commercial membrane is now reaching a first real replacement rather than another season of patching.
What We Do on Markham Roofs
Markham jobs range from tracing a single stain in an office ceiling tile to staged tear off and full replacement across an entire building. We rebuild curbs and penetration flashings, repair and replace drains, reset ponding areas with tapered insulation, reflash skylights and roof hatches, and answer emergency flat roof calls at any hour.
Where Markham Sits in Our Service Area
The plan opens on this part of the GTA. Every city we cover in the region is in the legend beside it.
Select a region on the plan
Systems That Suit Markham
Large Markham office and campus fields suit mechanically fastened or adhered TPO and PVC, with PVC wherever exhaust grease lands on the membrane. Podium and amenity decks need protected assemblies under pavers. Small residential decks stay on two ply modified bitumen or EPDM. Compare every flat roofing system.
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
Local Considerations in Markham
The conditions that decide how long a roof here lasts, and what we detail differently because of them.
- Office and campus roofs sit directly over occupied floors, so a small membrane failure becomes ceiling tile damage and tenant complaints long before anyone climbs a ladder to look.
- Wide steel deck fields deflect slightly between supports, and once tapered insulation has compressed the water settles at midspan instead of draining, which is exactly where seams give up.
- Mid rise podium and amenity decks bury the membrane under pavers and planters, so leak tracing means lifting finishes carefully rather than reading an open field.
Recent Flat Roofing Projects
Real jobs photographed on site by the crews who did them.
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
What we have written about keeping a low-slope roof watertight in this climate.
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.
Flat Roof Replacement in Markham: Costs and Options
Flat roof replacement in Markham: 2026 cost ranges, membrane options, permit rules and project timelines, plus how to choose a low slope roofing contractor.
Flat Roofing in Markham: 2026 Homeowner Guide
Flat roofing in Markham: 2026 costs, membrane options, drainage and slope fixes, permit rules, insulation targets and how to compare contractor quotes.
Markham Flat Roofing Questions
Straight answers to what people ask us about a roof on this street.
Can our Markham office building be re roofed while staff are working?
Yes, and it is the normal way we run these projects. The roof gets divided into sections, only one is opened at a time, and each is watertight before the crew leaves for the day. Hoisting and deliveries are scheduled around business hours, and odour producing work is planned with your building manager. Most Markham tenants notice the crane more than the roof.
Water is pooling on our flat roof days after rain in Markham. Is that a problem?
Ponding that lasts more than about 48 hours is a problem. It loads the deck, speeds up seam and membrane breakdown, and on a Markham commercial roof it normally points to either blocked drains or a deck that has deflected. The correction is restoring drainage, or building the low area back up with tapered insulation during re roofing.
Which system should a large Markham commercial roof use?
For wide open fields, single ply TPO or PVC is the standard: light coloured to cut heat load, weldable seams, and a service life commonly quoted in the 20 to 30 year range when maintained. PVC is the right call wherever kitchen or lab exhaust deposits grease or chemicals. Two ply SBS remains a solid choice on small, cut up sections and mechanical wells.
Do you do residential flat roofs in Markham too?
Yes. Garage decks, entry porticos, rear additions and full modern flat roofed homes are all regular Markham work. Residential sections are small but detail heavy, because they nearly always end at a taller wall or under a sloped roof, and that junction is where most leaks begin. Quotes are free, with nothing owed either way.
Nearby Areas We Also Cover
Flat roofing in the streets either side of Markham:
Richmond Hill • Thornhill • Vaughan • All of York Region
Google Reviews
Reviews From Across the GTA
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Get a Free Flat Roof Quote in Markham
Free, no-obligation quotes across Markham and the rest of York Region, and a 24/7 emergency line on (647) 333-3528.