VMZINC, elZinc, RHEINZINK, PREFA, KME and GreenCoat: An Installer's Honest Comparison

We install all six of the brands people search for — VMZINC, elZinc and RHEINZINK zinc, PREFA aluminium, KME and Aurubis copper, and GreenCoat PLX coated steel — so we have no shelf to clear when we recommend one. The honest truth is that all six are excellent; the differences that matter are which mill suits your building, which finish range carries your colour, and what needs to go into the specification for the warranty to hold. That is what this guide covers — an installer's view, not a catalogue.

The brand matters less than the system, the finish and the specification. A great mill installed badly is still a bad roof.

This is written for architects choosing a system and developers sanity-checking a tender, but homeowners will find it useful too — if your quote names one of these brands, this is what the name actually buys you.

The six brands at a glance

VMZINC: the specification default

VMZINC is the name architects reach for first in UK hard metal, and the finish system is why: natural zinc that weathers to its own grey, QUARTZ-ZINC for a light pre-weathered grey from day one, ANTHRA-ZINC for anthracite near-black, and the PIGMENTO range for bonded mineral colour — browns, reds, greens, blues and blacks that still read as real zinc. We installed VM Zinc Quartz standing seam at Woodlark Road, Cambridge (2024), and it is the system we would put on most London extensions without hesitation.

Watch-outs: pigmented and special finishes carry factory lead times — order them early in the programme — and on large façades, batch-check colour consistency before fabrication. Neither is a problem if your contractor plans it; both are expensive if they discover it on the scaffold.

elZinc: the value-competitive alternative

elZinc matches the VMZINC system logic — natural, pre-weathered slate and graphite tones, plus the Rainbow colour range — often at a keener material price. Where a client wants a coloured zinc and the budget is honest, elZinc is frequently the right recommendation. The watch-out is simply planning: confirm the finish is in stock or scheduled before the programme depends on it.

RHEINZINK: pre-weathered and heritage-friendly

RHEINZINK's prePATINA finishes — blue-grey and graphite-grey — are the most heritage-convincing pre-weathered zincs on the market; they read as mature metal from the day they are fixed, which is exactly what conservation officers want to see. The palette is deliberately narrow, and that restraint is the point: if the building wants a quiet, traditional grey, RHEINZINK is often the cleanest answer.

PREFA: why we give aluminium its own section

PREFA is the strongest aluminium system we work with: coil-coated in a wide colour range, exceptionally colour-stable, light enough for long spans and big repetitive areas, and backed by coating guarantees of up to 40 years on the right systems. Where zinc and copper are living metals that change, PREFA is the specified-colour metal — the shade at handover is the shade in year twenty.

That is why we installed aluminium cladding on the Travelodge Twickenham project (2025): a commercial envelope where a stable, warranted finish across a large area beat a living metal. For more on the system itself, see our aluminium roofing page and our PREFA project post.

Watch-outs: aluminium moves more with temperature than zinc, so long bays need the right clip and seam strategy, and it needs the same separation discipline from copper runoff as any non-copper metal.

KME and Aurubis: copper by design

For copper we work with the two names that matter: KME's TECU ranges — Classic natural, Oxid pre-oxidised brown, Patina factory-green — and Aurubis's Nordic range, including Nordic Green, Nordic Brown and the colour-stable golden alloy Nordic Royal. Between them they cover every version of copper: the full patina journey, the mature look on day one, or warmth without greening at all.

Watch-outs are the copper rules from our patina guide: runoff must be kept off zinc, aluminium and coated steel below, and pre-patinated panels should be batch-checked — two production batches of Nordic Green can read as two different greens on one elevation.

GreenCoat PLX: colour-coated steel, properly done

GreenCoat PLX is Swedish colour-coated steel whose coating is made with rapeseed oil in place of a substantial portion of conventional fossil oils. It folds cleanly for standing seam, holds a named palette of around 20–30 colours, and lands below zinc on installed cost — which is why it was the right answer at Blackett Ord Court, Royston (2023). For budget-aware extensions, rural plots and agricultural-to-residential conversions, PLX is often the correct metal rather than the compromise.

We install GreenCoat PLX across London and the South East — recent work and enquiries span Greenwich, Hackney, Islington, Camden, Sevenoaks and Dartford — and we cover the whole region from our Enfield base rather than pretending to a shopfront in every borough.

What architects must write into the specification

The warranty lives or dies in the spec, not on the scaffold. Four lines do most of the work:

1. Name the system, not just the metal. “VMZINC QUARTZ-ZINC standing seam” is enforceable; “zinc roofing” is an invitation to substitute.

2. Specify the build-up. Substrate, breathable underlay, ventilation strategy and insulation are part of the metal system. If they are not in the spec, they are optional — and skipped build-ups are how zinc fails.

3. Write the separation note. Copper runoff, dissimilar-metal contact and compatible fixings, one paragraph in the prelims, prevents the most expensive mixed-metal failure there is.

4. Name the installer competency and warranty split. State that the installer must demonstrate completed work in the specified system, and write down who carries the workmanship warranty and who carries the material warranty. Two warranties, two parties, both in writing.

How this goes wrong on site

The brand-level failures we inspect are remarkably consistent. A tender that said “zinc or equivalent” and got an equivalent the architect never approved. Pigmented zinc ordered after the programme was fixed, arriving three weeks late and holding the scaffold. Pre-patinated copper from two batches alternating up a façade. A PREFA roof fixed rigid across long bays, oil-canning in its first summer. None of these are bad brands — they are specifications and programmes that left the brand to fend for itself.

If you are choosing a brand — pick your seat

If you are an architect

Send the drawing set and we will tell you which mill and finish we would put where, what the spec needs to say for the warranty to hold, and where the lead-time risks sit. A twenty-minute review before tender is cheaper than any of the failures above.

If you are a developer

Ask every tendering contractor which brand and finish they have priced, and why. The answer tells you whether they have a manufacturer relationship or a merchant account — and whether the quoted price can survive a colour lead time. Send us the roof plan and we will return a system recommendation with programme notes.

If you are a homeowner

You do not need to become a zinc expert — you need to know that the brand named in your quote is real, appropriate and available. Ask which of these six it is, ask to see it installed locally, and ask for samples. A contractor who installs all six has no reason to steer you wrong.

FAQs

What should I look for in a VMZINC installer?

Three things: completed projects in the actual system you are specifying (not just “zinc”), in-house fabrication of flashings and trims, and a written workmanship warranty alongside the manufacturer material warranty. Manufacturer training or approved-installer schemes are a useful extra signal — ask any contractor to state plainly which credentials they hold, and weigh the project proof alongside the badges.

VMZINC vs elZinc vs RHEINZINK — what is the actual difference?

All three are quality zinc to the same European standards. The practical differences are finish ranges and availability: VMZINC has the widest UK specification presence and the PIGMENTO colour range, RHEINZINK's prePATINA greys are the heritage favourites, and elZinc is often the value-competitive route with a strong colour offer. A specialist installer will recommend by finish and lead time, not by logo.

Who installs PREFA roofing in the UK?

PREFA is installed by specialist hard-metal and aluminium contractors rather than general roofers. Look for completed PREFA projects at your scale — the system's movement detailing and colour stability rewards experienced hands. We install PREFA across London and the South East; send the drawings and we will confirm fit within 48 hours.

Are GreenCoat PLX installers available near me?

GreenCoat PLX comes through specialist standing-seam contractors rather than a mass installer network. Most South East specialists cover the whole region — we work across London, Essex, Kent, Hertfordshire and beyond from Enfield, so “near me” matters less than demonstrated PLX work and folded-sample quality.

Can I mix brands on one project?

Yes, and it is often sensible — VMZINC on the roof, PREFA on the cladding, KME copper on a feature bay. Two rules: keep the metal compatibility and runoff rules, and do not mix brands within the same visible finish zone, because two mills' “anthracite” are rarely the same anthracite.

Does the brand affect the warranty?

The material warranty comes from the manufacturer and depends on the correct system, build-up and installation being specified and followed — which is why the four specification lines above matter. The workmanship warranty comes from your installer and is separate. Ask for both, in writing, whoever you hire.

Send the Spec — Get an Installer's View in 48 Hours

Send your drawings, specification or even a tender return, and we will come back in writing within 48 hours: which brand and finish we would put where, what the spec needs to say, and where the lead-time and batching risks sit. Or book a site survey and we will bring samples of all six brands to review in your own daylight.

Prefer to read first? See our VMZINC roofing work, the elZinc and RHEINZINK systems, or the products we use and why.

Dr Mastercraft Ltd — supply and fit of VMZINC, elZinc, RHEINZINK, PREFA, KME, Aurubis and GreenCoat PLX roofing and cladding. Based in Enfield, working across London and the South East. Call the office to book your survey.