Ontario · Aluminum roofing · Made in Canada

Aluminum roofing in Ontario

We install Interlock® aluminum roofs on Ontario homes, cottages and condo and townhouse complexes: interlocking panels that don't rust, locked on four sides with the fasteners out of the weather. 8,261 completed in Ontario since 1998, made in Canada, priced in writing after one visit.

Reviewed by Scott Plumptree, Director of Marketing, The Interlock Group · Updated October 7, 2026

Get a free quote (416) 620-2174

Ontario roofs

8,261 completed since 1998

From our job book, town by town.

The metal

Aluminum doesn't rust

An oxide film protects it; there's no steel inside to corrode.

The warranty

Guardian Lifetime Limited Material Warranty

Material and finish, original purchaser, transferable once.

What an Interlock® aluminum roof is

An Interlock® roof is made of interlocking aluminum panels, each locked to its neighbours on all four sides with the fasteners concealed under the panel above. Nothing is screwed through the weather surface. The panels are stamped to look like slate, cedar shingle, shake or tile, or rolled as standing seam.

The panels are made in Canada by Interlock Roofing at its plant in Delta, BC. In Ontario they are installed by our own company, Interlock Metal Roofing (Ontario) Ltd., from our office in Mississauga.

Aluminum roofs we've installed in Ontario

Recent Interlock® roofs installed in Ontario by our own company. Tap a roof to see all of its photos.

See every Ontario roof in the gallery

Why aluminum, for an Ontario roof

It doesn't rust

Aluminum forms a thin oxide film that blocks further oxidation (ASM International). There is no steel inside an aluminum panel for water, road salt or a scratch to reach, so there is no red rust at cut edges or fastener holes.

It's light

Aluminum is about one-third the density of steel (ASM International). Interlock panels weigh roughly 2 to 3.5 kg per square metre, a fraction of concrete tile or natural slate.

Freeze-thaw has nothing to work on

Asphalt and wood take on water that freezes and thaws through an Ontario winter. Aluminum absorbs no water, so there is nothing in the panel for freeze-thaw to open up.

Snow slides

Smooth aluminum sheds snow rather than holding it. Where a slide would land on an entry, deck, walkway or driveway, we plan snow guards at the estimate.

The profiles, and what Ontario homeowners choose

Five aluminum profiles: Slate (the most popular), Cedar Shingle, Shake, Mediterranean Tile and Standing Seam, plus solid copper for bays, porches and accents. Nine colours: Solid Copper, Copper Penny, Hunter Green, Black, Deep Charcoal, Musket Grey, Tile Red, Colonial Brown and Tudor Brown. Every profile needs a minimum 3/12 slope.

Across our Ontario town pages the most common profiles in the job book are Original Shingle (3,211), Slate (2,659), Cedar Shingle (280). Original Shingle is the first Interlock shingle profile, no longer made; today's choices are the five above.

What's covered, in writing

Guardian Lifetime Limited Material Warranty, from the manufacturer: material and finish, for as long as the original purchaser owns the home, transferable once. Workmanship is excluded, and ice damming is a stated exclusion.
30 Year Alunar® Coating Warranty on the finish.
10 Year Limited Labour Warranty from Interlock Metal Roofing (Ontario) Ltd. on our installation (Ontario Form 5290).
Wind resistance warranted to 193 km/h (120 mph) installed to manufacturer specification.
Class A Fire Rated Available, as a complete assembly: two layers of GAF VersaShield® over 12 mm (15/32-inch) plywood, per ASTM E108.

How a roof gets done

From first call to finished roof
Step	What happens
1. Consultation	On Zoom (most homeowners choose it) or at your home. We go through profiles and colours, look at photos of roofs like yours, and answer questions.
2. Measure and inspect	We measure the roof and check what's on it now. Cedar, concrete tile and natural slate always come off; a single layer of asphalt can be roofed over only if the inspection finds it suitable.
3. Fixed price in writing	Anything the inspection finds goes into the written quote before you sign, not into a change order later.
4. Installation	Our own Ontario installers, to the manufacturer's specification, with flashing, ventilation and snow guards as planned.
5. Warranties registered	The Guardian material warranty and our labour warranty, with our Ontario service team after the job.

Where we work

8,261 completed Interlock® roofs in Ontario since the company was founded in 1998, recorded town by town in our job book. 210 towns have their own page with their install record. Northern Ontario is considered case by case.

Questions, answered

Who installs aluminum roofing in Ontario?

Interlock Metal Roofing (Ontario) Ltd. installs the Interlock® aluminum roofing system across Ontario from its office at 2800 Argentia Rd #5, Mississauga. The company was founded in 1998 and installs every roof itself. Call (416) 620-2174.

Is aluminum roofing good for Ontario winters?

Aluminum doesn't rust and absorbs no water, so freeze-thaw has nothing to work on, and its smooth surface sheds snow. Ice dams are a different matter: they come from heat loss into the attic and from ventilation, no roof stops them on its own, and ice damming is a stated exclusion of the material warranty. We look at ventilation and insulation with you.

Is an aluminum roof better than a steel roof?

They are both metal roofs, but steel depends on its zinc or aluminum-zinc coating to keep from rusting, and aluminum has no steel to rust. Aluminum is also about a third the weight. Steel roofing usually costs less up front. Our steel vs aluminum guide sets out the differences.

How much does an aluminum roof cost in Ontario?

It depends on the roof's area, pitch and complexity, what comes off, the profile and options such as the Class A assembly. We give a fixed price in writing after one free visit; we don't publish a number that would be wrong for most houses.

Can an aluminum roof go over my asphalt shingles?

Sometimes: a single layer of asphalt can be roofed over only if our inspection finds it suitable. Cedar shakes, concrete tile and natural slate always come off first.

Is an aluminum roof noisy in the rain?

Installed over a solid roof deck and underlayment, as residential Interlock roofs are, it isn't the drumming of bare metal on an open-framed barn. The deck and underlayment are what make the difference.

How long does an aluminum roof last?

Aluminum has been known to last over 100 years. That is a property of the metal, not a promise; what is covered in writing is the Guardian Lifetime Limited Material Warranty, the 30 Year Alunar® Coating Warranty and our 10 Year Limited Labour Warranty.

Sources

Product specifications are the manufacturer's (Interlock Roofing). Install counts are from our own job book. Reviewed by Scott Plumptree, October 7, 2026.

Get your aluminum roof priced.

A fixed price in writing after one visit, at your home or on Zoom. Interlock Metal Roofing (Ontario) Ltd. · 2800 Argentia Rd #5, Mississauga, ON L5N 8L2