Ontario · Metal shingles buyer's guide

Metal shingles in Ontario: how to choose

Metal shingles are steel or aluminum panels stamped to look like shingles, slate, shake or tile. The base metal is the decision that matters: steel lasts as long as its zinc or aluminum-zinc coating keeps it from rusting, while aluminum doesn't rust and weighs about a third as much. Interlock® metal shingles are aluminum, made in Canada.

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

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Painted steel

Usually the lowest price

Protected by its metallic coating and paint.

Stone-coated steel

A matte, granular look

Steel underneath, with the same coating dependence.

Aluminum

Doesn't rust

About one-third the density of steel (ASM International).

The three kinds of metal shingle

"Metal shingles" covers three different products that look alike from the street and behave differently on a roof for decades. The difference is the metal underneath the paint.

Painted steel, stone-coated steel and aluminum metal shingles compared
Type	What it is	What protects it	Weight	What to watch
Painted steel shingles	Steel sheet with a metallic coating and baked paint, stamped to a shingle, tile or slate look	A zinc (galvanized) or aluminum-zinc (Galvalume) coating under the paint	Heaviest of the bare metals for the same thickness	Rust can start where the coating is cut, scratched or worn through, and at cut edges as the coating is used up
Stone-coated steel shingles	Steel shingles with stone granules bonded to the surface for a matte, textured look	The metallic coating, plus the granule layer	Heavier than painted metal	Granules can wear off in valleys and walkways; the steel underneath has the same coating dependence
Aluminum shingles	Aluminum sheet with a baked finish, interlocked panel to panel	Aluminum's own oxide film, which blocks further oxidation; there is no steel to rust	About one-third the density of steel	Aluminum can dent under large hail or foot traffic; usually costs more than steel up front

Steel coating behaviour: ArcelorMittal Dofasco (Galvalume product information) and Gibraltar Building Products. Aluminum properties: ASM International. Full references at the end of the page.

Interlock® metal shingles on Ontario homes

Recent Ontario jobs in the shingle, slate and shake profiles, installed by our own company. Tap a roof to see all of its photos.

See every Ontario roof in the gallery

What matters most on an Ontario roof

Freeze-thaw and snow

A roof here goes through freeze-thaw cycles and weeks of snow load every winter. Metal sheds snow and absorbs no water. Plan snow guards over entries, decks and walkways before the first slide, not after.

Concealed fasteners

Exposed screws through the face of a panel depend on rubber washers that age in sun and cold. Shingles that interlock with the fasteners hidden under the next course have no exposed screw heads to re-seal.

Ice dams

Ice dams come from heat escaping into the attic and from ventilation, not from the roof covering. No metal shingle stops them on its own; ask any contractor how they will deal with your attic.

Who installs it

Interlocking shingles are less forgiving of poor installation than asphalt. Ask who will be on your roof, whether they are the manufacturer's certified installer, and who handles service calls.

Questions to ask any metal shingle contractor

What is the base metal, steel or aluminum, and what is its thickness?
Who is the warrantor of the material warranty, the manufacturer or the contractor, and does coverage reduce over time?
Is the finish warranty separate from the material warranty, and what does it cover (chalking, fading, peeling)?
Are the fasteners exposed or concealed?
Will my old roof come off? If you plan to roof over it, what does your inspection check first?
Do you carry WSIB coverage and liability insurance, and will you show me the certificates?
Is the price in writing, and what happens if you find rot once the old roof is open?

Interlock® metal shingles

We install one metal shingle system: the Interlock® aluminum roof, made in Canada by Interlock Roofing. Panels interlock on all four sides with the fasteners concealed, in Slate, Cedar Shingle, Shake and Mediterranean Tile, plus Standing Seam, in nine colours.

The manufacturer's specification: aluminum alloy per ASTM B209 at 0.019 in (0.483 mm) nominal base thickness, a five-layer Alunar® fluorocarbon finish with a 30 Year Alunar® Coating Warranty, and the Guardian Lifetime Limited Material Warranty on material and finish. Wind resistance is warranted to 193 km/h (120 mph) installed to manufacturer specification.

In Ontario we have completed 8,261 Interlock® roofs since 1998, all installed by our own company.

Questions, answered

What are metal shingles?

Metal shingles are roofing panels stamped from painted steel, stone-coated steel or aluminum to look like asphalt shingles, slate, cedar shake or tile. They install in overlapping or interlocking courses, like shingles, rather than as long vertical sheets.

Are metal shingles good for Ontario?

For a house you plan to keep, they suit Ontario well: they shed snow, absorb no water for freeze-thaw to work on, and outlast asphalt. The choice that matters most is the base metal. Steel depends on its coating to keep from rusting; aluminum doesn't rust.

Steel or aluminum metal shingles?

Steel usually costs less up front. Aluminum doesn't rust, weighs about a third as much for the same thickness, and suits roofs near water, under trees that keep it damp, or anywhere you want the longest-lived option. Aluminum can dent under large hail; so can thin steel.

Do metal shingles cost more than asphalt shingles?

Yes, up front. Over 50 years the comparison usually turns, because an asphalt roof is replaced and torn off again. We give a fixed price in writing for an Interlock® roof after one visit; ask any asphalt roofer for theirs and compare both over the years you'll own the home.

Can metal shingles go over existing asphalt shingles?

Sometimes. A single layer of asphalt can be roofed over only if an inspection finds it suitable and local code permits. Cedar shakes, concrete tile and natural slate always come off first.

Are metal shingles noisy?

Over a solid roof deck and underlayment, which is how residential metal shingles are installed, they are not the drumming of a bare metal barn roof.

Who installs metal shingles in Toronto and the GTA?

Interlock Metal Roofing (Ontario) Ltd. installs Interlock® aluminum metal shingles across the GTA and Ontario from its office in Mississauga. Call (416) 620-2174 or book a free consultation on Zoom or at home.

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 Interlock® metal shingles 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