Coil in one end. A finished roof out of the other.

We buy coated steel coil to a specification rather than to a price, because nothing downstream can recover a substrate or a paint system that was wrong to begin with. Grade, thickness, metallic coating weight and paint system are all specified before a coil enters the building.

Incoming coil is checked and recorded against its certification, and batch identity is carried through the whole process — so a replacement sheet ordered years later can be matched to the original production run rather than to a colour name.

A profile is formed by passing the strip through a sequence of roller stands, each one adding a small amount of the final geometry. Done properly, the steel arrives at the last stand having been persuaded into shape rather than forced, which is what keeps a long sheet straight and free of twist.

Tooling is set and verified for each profile at the start of a run. Cover width, rib height, seam geometry and squareness are measured against the profile drawing before the run is released — the difference between a roof that goes together on site and one that fights the installer for a week.

Cutting to length is how we produce, not an option on top of it. Sheets are made to the length of the run wherever transport and handling allow, which removes transverse laps from the roof — historically the first place a metal roof leaks and always the first place it looks untidy.

The limits are transport, site access and what a crew can safely handle in wind, not the line. Long-sheet projects are planned with the delivery and the lift together.

Trims and flashings are folded on our own brakes from the same coil as the roof they finish. That is why a VANKKA trim matches a VANKKA roof exactly — same coating batch, same gloss, same colour — where a trim sourced separately in the same nominal colour rarely does.

Bespoke work runs on the same equipment. Send a drawing, a sketch or a site survey; we return a folded profile drawing for approval before anything is produced.

Dimensional checks against the profile drawing, coating film thickness and adhesion checks, and visual inspection under controlled lighting — carried out through the run rather than as a final gate, so a drifting parameter is caught while it is still a few sheets rather than a few hundred.

Every delivery is traceable to its production run and coil batch. Documentation is issued with the goods, not chased afterwards.

Coated steel is easy to damage between the line and the site, and damage found on site is expensive for everyone. Packing is specified against the transport method and the journey — a pallet going three hours by truck and a container crossing the Atlantic are packed differently.

For North American deliveries, packing and sheet lengths are coordinated with our Halifax team against the shipping method, which is worth planning early because it can influence how the roof is set out.