Commercial & Large-Scale Metal Finishing

Commercial Roofing & Flashing Manufacturing

Commercial roofing projects demand flashings and metal components that are manufactured accurately, finished consistently, and delivered on schedule. At Coating Lab, we manufacture custom flashings for commercial builds across Auckland — warehouses, retail developments, apartment complexes, schools, and industrial facilities. Whether it's a full set of long-run flashings for a new warehouse roof or replacement flashings for a commercial re-roof, we handle the lot.

We work directly with roofing contractors, builders, project managers, and construction firms. If you need a bulk flashings supplier in Auckland who can fold, finish, and deliver to your site, talk to us about your next project.

Large-Scale Flashing Production

Commercial builds don't come in small numbers. When you've got a warehouse that needs ridge capping, barge flashings, apron flashings, and box gutters across a large roofline, you need a supplier set up for volume. We manufacture roof flashings in bulk runs — same profile, same colour, same quality from the first piece to the last.

Long-run flashings are our bread and butter for commercial work. Our folding equipment handles the volume needed for large commercial roofing projects, and we maintain tight tolerances across entire production runs. That means your roofers aren't wasting time on site dealing with inconsistent components — everything lines up and fits as expected.

We can produce flashings in a range of profiles and sizes. If you've got architectural drawings or a schedule of flashings, send it through and we'll work from your specifications.

Powder Coating for Commercial Projects

Beyond flashings, powder coating is a core service for commercial clients. Structural steel, balustrades, handrails, louvres, cladding panels, shopfront metalwork — anything metal that needs a durable, professional finish. Powder coating provides superior resistance to chipping, fading, and corrosion compared to wet paint, making it the preferred choice for commercial buildings that need to look good and last.

For commercial builds with specific colour requirements, we record colour specifications and maintain consistent application processes across batches. If your project calls for a specific RAL or custom colour, we can match it. The result is uniform colour and finish across all components — whether you're coating ten pieces or a hundred.

Zinc Arc Spraying for Structural Steel & Roofing

Commercial structural steel and roofing components exposed to the elements need serious corrosion protection. Zinc arc wire spraying provides a metallic zinc coating that acts as a sacrificial barrier against rust and corrosion. It's used on structural steel beams, purlins, brackets, and other components where long-term protection matters.

For commercial roofing work, zinc arc spraying is particularly valuable on steel components that will be enclosed or difficult to access after installation. Getting the protection right before installation means the steel performs for the life of the building. We also offer sandblasting as surface preparation to ensure proper adhesion of protective coatings.

Coordinating with Commercial Project Timelines

Commercial construction runs on schedules. Flashings, coated steel, and finished components need to arrive when your team is ready for them — not before they have somewhere to store them, and not after they've moved on to the next stage. We can coordinate staged delivery to match your construction programme, supplying components in the order your build requires them.

Talk to us early in your project planning. If we understand your programme and the scope of work, we can plan production to fit your timeline. For ongoing commercial accounts, we can set up a workflow that keeps things moving without the back-and-forth.

What Else We Do for Commercial Clients

Commercial roofing and flashings are a major focus, but we also serve commercial clients across other sectors:

• Gym and fitness equipment — weight frames, racks, cable systems, benches, and machines
• Commercial signage — sign frames, letters, fascia panels, and wayfinding hardware
• Balustrades and handrails — commercial building balustrades, lobby handrails, and stair systems
• Retail and hospitality fitout — shelving systems, display stands, counter frames, and furniture
• Industrial equipment housings — enclosures, panels, frames, and brackets
• Street furniture and public space metalwork — benches, bike stands, and bollards
• Manufacturing components — production parts requiring protective or decorative finishing

Learn more about gym equipment powder coating →

Learn more about balustrade and handrail powder coating →

Colour Consistency Across Bulk Runs

When you're coating or manufacturing components for a single commercial project, colour consistency is non-negotiable. A batch of flashings that don't match, or powder coated balustrades that vary from floor to floor, creates problems on site and looks unprofessional on the finished building. We take this seriously — recording colour specifications, maintaining consistent processes, and checking output throughout production runs to make sure everything matches.

For projects with specific colour requirements tied to architectural specifications, discuss this with us at the quoting stage so we can confirm we can match what you need.

Get a Quote for Your Commercial Project

Whether you need bulk flashings for a commercial roofing project, powder coating for structural steel, zinc arc spraying for corrosion protection, or any combination of services — get in touch for a free quote. Send through your drawings, schedules, or specifications and we'll come back to you with what we can do.

Frequently Asked Questions