Flat roofing for the Greater Toronto Area, built the way it should be
GTA Flat Roofing pairs technical rigour with an eye for finish, delivering membrane and built-up roofing systems that hold their line through Ontario's freeze-thaw winters and humid summers alike. Based near Mississauga, we work across the GTA.
Email Us for a Free EstimateWhy homeowners choose us
Free estimates · No obligation
A quieter kind of roofing company
Most roofing outfits sell you a repair. We think about the building. A flat or low-slope roof in this region has to manage ponding water, ice damming at parapets, and the slow expansion and contraction that comes with a Southern Ontario climate swinging from minus twenty to plus thirty over a calendar year. Getting that right is less about speed and more about sequencing — tapered insulation set correctly, seams welded with the right overlap, drains sized for the roof they actually serve.
Membrane systems done to spec
TPO, EPDM and modified bitumen installed to manufacturer tolerances, not shortcuts, with warranty documentation kept on file.
Drainage engineered, not guessed
We assess slope and ponding before we quote, so the roof you get actually sheds water instead of holding it.
Built for the GTA climate
Freeze-thaw cycling and lake-effect snow loads are designed into every detail, from parapet flashing to drain placement.
Clean, considered execution
Job sites left tidy, penetrations sealed properly, and finishes that look intentional rather than patched.
Flat roofs fail quietly, then all at once
A low-slope roof rarely announces trouble the way a shingle roof does. Water finds a seam, tracks along the deck, and shows up as a stain on a ceiling two rooms away from where it entered — often months later. In older GTA commercial buildings and additions, we regularly find failed flashing or a ponding area that's been quietly degrading the membrane since the last freeze-thaw season, unnoticed until a spring thaw pushes it past the point of patching.
A properly documented assessment, then a plan that fits the building
We start with a real inspection — moisture patterns, membrane condition, drain function, flashing integrity — and give you a plan with options, not just a number. Sometimes that means a targeted repair. Sometimes the smarter move, given the roof's age and condition, is a phased replacement that protects your budget while getting ahead of the next winter.
What we do
Every service below is handled by the same crew, to the same standard — no subcontracted patchwork.
Flat & Commercial Roofing
Membrane and built-up roofing systems for commercial and multi-unit properties across the GTA, installed and warrantied properly.
Learn moreGutter Installation & Repair
Eavestrough and drainage work sized to actually handle Ontario's rain and snowmelt volumes, not just to code minimums.
Learn moreRoof Inspection Services
A documented, photographed assessment of membrane, flashing and drainage condition, with plain-language findings.
Learn moreRoof Leak Repair
Source-first leak diagnosis and repair, tracing water to its actual entry point rather than patching the ceiling stain.
Learn moreRoof Repair Services
Targeted repairs to shingle, flat and low-slope roofs that extend service life without unnecessary full replacement.
Learn moreRoof Replacement
Full tear-off and replacement for roofs that have reached the end of their serviceable life, specified to outlast the last one.
Learn moreStorm & Hail Damage Repair
Assessment and repair after wind, hail or ice events, with documentation suited to insurance claims.
Learn moreWhy GTA property owners choose us
We built this company around the belief that a roof is infrastructure, not an afterthought — and that the details most companies skip are the ones that matter most.
Licensed & insured
Full licensing and insurance on every project, with documentation available before work begins.
Considered scheduling
We plan around Ontario weather windows rather than rushing installs into conditions that compromise the membrane.
Craftsmanship-led crews
Our installers are trained on the specific systems we specify, not generalists working outside their expertise.
Respect for the building
We treat every property, commercial or residential, as though it were our own — protected surfaces, clean sites.
Durable, low-impact materials
We favour long-service-life membrane systems that reduce landfill turnover and long-term cost.
Detail over speed
Flashing, terminations and drainage get the attention that determines whether a roof lasts ten years or thirty.
How a project with us unfolds
A straightforward process, communicated clearly at every stage.
- 1
Email us your details
Tell us about the property, the roof type, and what's prompting the inquiry — a leak, an age concern, or routine due diligence.
- 2
On-site assessment
We walk the roof, document its condition, and identify the actual cause of any issue rather than assuming.
- 3
A written proposal
You receive a clear scope and quote, with options where they genuinely exist, before any work is scheduled.
- 4
The work itself
Scheduled around suitable weather, executed to spec, with the site left as clean as we found it.
- 5
Documentation handed over
Warranty paperwork and a summary of the work performed, kept on file for your records.
Common questions
Do you work on residential and commercial roofs?
Yes. Our core expertise is flat and low-slope commercial roofing, but we also handle residential roof repair, replacement and gutter work across the GTA.
How do I request a quote?
Email us with your property details and the issue you're seeing, and we'll arrange an on-site assessment before providing a written quote.
Which areas do you serve?
We're based near Mississauga and serve the wider Greater Toronto Area, including Peel, Halton, York and Durham Regions and the City of Toronto.
What roofing systems do you install?
TPO, EPDM and modified bitumen membrane systems for flat and low-slope roofs, alongside conventional shingle roofing for pitched residential roofs.
Do freeze-thaw winters really affect flat roofs?
Significantly. Repeated freezing and thawing stresses seams and flashing over time, which is why detail work at those points matters more here than in milder climates.
Service coverage
Serving the Entire Greater Toronto Area
5 regions, 28 communities — wherever you are in the GTA, GTA Flat Roofing is close by. Pick your area to see how we can help.
| Region | Communities served |
|---|---|
| City of TorontoView region → | Downtown Toronto · East York · Etobicoke · North York · Scarborough |
| York RegionView region → | Aurora · East Gwillimbury · Georgina · King · Markham · Newmarket · Richmond Hill · Vaughan · Whitchurch-Stouffville |
| Peel RegionView region → | Brampton · Caledon |
| Halton RegionView region → | Burlington · Halton Hills · Milton · Oakville |
| Durham RegionView region → | Ajax · Brock · Clarington · Oshawa · Pickering · Scugog · Uxbridge · Whitby |
Ready to talk about your roof?
Email us the details and we'll arrange an assessment — no pressure, just a clear picture of where things stand.
Email Us for a Free EstimateWeather is hard on your roof — email us for a same-day inspection.
Summer roofing conditions in Mississauga, ON
Summer heat and thunderstorms around Mississauga, ON put roofs through intense UV, expansion, and sudden wind and hail. Heat accelerates shingle aging, so summer is prime time for inspections and repairs.
Proudly Serving Mississauga, ON
Local, on-time service throughout Mississauga and the surrounding area.