Corrugated Weathered Steel Roofing

Real weathering steel roofing with the look of a hundred-year-old barn roof — without the hundred-year wait. Every sheet is corrugated steel, finished or sourced by Dakota Tin to age the honest way: out in the weather. Put it on a house, porch, cabin, shed, cupola, barndominium, or a commercial build that should look like it's always been there.

Choose your finish, length, and quantity in the quote form above, and we'll send back one all-in price including freight. All three are roofing-grade corrugated steel in the same old-fashioned profile — what changes is how each one ages (or doesn't) and the look you're after.

The real old-fashioned corrugation. These are narrow, small-wave panels — about 1.25" from peak to peak — the same tight profile you see on hundred-year-old barns, not the wide 2.5" corrugation on most modern metal roofing. It's a big part of why these roofs read as authentically old, not brand-new. (See the profile drawing in the photos.)

Corten Weathering Steel — 24 gauge

The real thing. A606 weathering steel ships bright and raw — not pre-rusted, then grows its own rust-orange patina over a few months of sun and rain. Once that patina sets it turns self-protecting — the rust layer shields the steel underneath instead of eating through it, so there's no clear coat or repainting to keep up. It's the thickest and most durable of the three.

About the photos — please read: the rust-orange color in our Corten photos and swatches is how it looks after it weathers — the finished result, not how it ships. Fresh Corten arrives a raw silvery-grey and takes a few months of sun and rain to color up. Want the rust look from day one? We can pre-rust your Corten for $1 per running foot — just request it on your quote and we'll start the patina before it ships.

Straight talk: while Corten weathers, it sheds rust-colored runoff, and that runoff will stain whatever sits below it — gutters, fascia, siding, concrete, walkways, plantings. Plan your flashing and drainage around it, or lean into it. This is true weathering steel doing exactly what it's built to do.

Antique Bonderized Galvanized — 26 gauge

A weathered, flat-grey finish with the look of an old galvanized roof. We start with G90 galvanized, bonderized (the "paint-grip" surface some builders know as a Resbond-type finish), and leave it bare so it reads aged from day one.

Straight talk: bonderized steel is built as a paint-prep surface, and left bare it keeps moving — expect uneven tone, streaking, and white-rust spotting as it weathers. Here, that patina is the point, not a flaw. Want to freeze the look it has now? It takes a clear coat well, and we offer a linseed sealant add-on.

Galvalume — 29 gauge

The bright, low-maintenance one — and the most budget-friendly. Galvalume is steel with a hot-dipped zinc-aluminum coating and a clear acrylic topcoat, so it holds a clean light-silver with a soft sheen instead of aging to rust or grey. Same narrow 1.25" barn corrugation as the other two, just in a finish that stays put: no patina to wait on, no rust runoff to plan around, and nothing to seal or maintain. It's the commodity sheet we keep in stock for folks who want the profile without the weathering.

Straight talk: this is the one finish here that doesn't weather — if you're after the aged, hundred-year-old look, go Corten or Antique. Galvalume reads new and bright, and it's the thinnest of the three at 29 gauge. What you get for that is the lowest price, the easiest upkeep, and a roof that looks the same in year ten as it did the day it went up.

Where it works

Full roofs and accent roofs alike — porch and patio roofs, cupolas and dormers, sheds and outbuildings, cabins and barndominiums, complete residential and commercial roofs, and just as often on exterior or interior walls as cladding. Corten, bonderized, and Galvalume all get used for whole roofs as well as accents; it comes down to the look you're after.

Specs

• Profile: classic narrow corrugation, about 1.25" peak to peak (the old-fashioned barn profile, not the modern 2.5")
• Panel width: 26"
• Length: cut to order, 2 to 12 ft — request your length in the quote form above
• Gauge: Corten 24 ga; Antique 26 ga; Galvalume 29 ga
• Material: A606 weathering steel (Corten); G90 galvanized (Antique); zinc-aluminum Galvalume-coated steel (Galvalume)
• Finishing: Corten can be pre-rusted for $1 per running foot (request on your quote); linseed sealant add-on available on Antique. Corten and Galvalume don't take linseed — and don't need it.

Shipping

Roofing sheets run up to 12 feet, so orders ship by LTL freight on a pallet, not UPS — and freight is paid by the customer. We'll confirm your freight cost to your delivery ZIP before anything ships, so there are no surprises at the curb. Questions on freight, a big order, or a custom run? Reach a real person at Dakota Tin — call 605-484-0875 or request a quote.

Not sure which one? Order a sample first — the easiest way to see how each one looks in your light before you commit to a whole roof.