Roof Flashings NZ — Custom Metal Roof Flashings in Auckland

Roof Flashings and Weathertightness

Roof flashings are formed sheet metal components that seal every junction, penetration, and edge on a roof. Wherever two surfaces meet — a roof plane and a wall, a ridge line, a pipe through a roofing sheet — water will find a way in unless a properly formed metal roof flashing stops it. In New Zealand, roof flashings are a critical part of meeting the weathertightness requirements set out in E2/AS1 of the Building Code. Incorrect or poorly fitted roof flashings NZ are one of the most common causes of leaks in residential and commercial buildings.

At Coating Lab in Auckland, we manufacture custom roof flashings to order — including corrugated roof flashing NZ profiles, tray, and standing seam details. Every flashing is folded to your specification — whether you supply architectural drawings, a sketch, or an existing piece to match. We work across all standard roofing profiles and can produce complex multi-fold pieces for non-standard details. If your project requires flashings that comply with specific consent conditions, we manufacture to the dimensions you specify so your installation meets the required standards.

Types of Roof Flashings

Roof flashings are not a single product but a family of components, each designed for a specific location on the roof. Below are the main types we manufacture.

Ridge Flashings

Ridge flashings (also called ridge cappings) sit at the apex where two pitched roof planes meet. They cap the exposed gap along the ridge line and prevent wind-driven rain from entering. We fold ridge flashings to match your roof pitch and profile, in lengths to suit your run.

Hip Flashings

Hip flashings cover the external angle where two roof planes meet at a hip. Like ridge flashings, they are formed to match the roof pitch. Hip flashings require accurate angle work to sit flush against both planes and maintain a clean, weathertight finish along the full length of the hip.

Valley Flashings

Valley flashings line the internal channel where two pitched roof planes meet. Valleys handle high volumes of water run-off, so the flashing must be wide enough to manage flow without overflow and must be installed with correct laps. We manufacture valley flashings in long lengths to minimise joints.

Apron Flashings

Apron flashings are used where a roof surface meets a vertical wall — lean-to junctions, dormers, chimneys, and upper-storey wall abutments. The flashing tucks under the wall cladding and laps over the roofing to direct water away from the junction. Apron flashings are one of the most commonly required roof flashings on residential builds.

Step Flashings

Step flashings are used where a pitched roof meets a wall that runs up the slope. Rather than a single long piece, step flashings are installed in overlapping sections that step up with each course of roofing. This approach accommodates movement and ensures each section sheds water onto the one below.

Parapet Flashings

Parapet flashings cap the top of parapet walls and direct water back onto the roof rather than into the wall cavity. They are common on flat-roofed commercial buildings and modern residential designs with concealed rooflines. Parapet flashings often require multiple folds and precise sizing to match the wall width.

Penetration Flashings

Penetration flashings seal around pipes, vents, flues, and other items that pass through the roof surface. Each penetration flashing is formed to suit the size and shape of the penetration, ensuring a tight fit that can be sealed and weatherproofed. We manufacture penetration flashings to your exact dimensions.

Materials for Metal Roof Flashings

Choosing the right material for your roof flashings depends on the environment, the roofing material, and the finish required. We manufacture metal roof flashings NZ in the following materials:

• Colorsteel — pre-painted steel available in popular roofing colours including Karaka, Ironsand, Ebony, and Grey Friars, as well as Sheerstone, Dune, Gull Grey, Thunder, and others. Colorsteel flashings give you an integrated look that matches your roof sheets straight off the folder. No additional coating required.
• Zincalume — aluminium/zinc coated steel with strong corrosion resistance. A practical, cost-effective choice where colour matching is not required or where the flashing will be powder coated to a specific colour.
• Aluminium — lightweight with excellent corrosion resistance. Well suited to coastal environments and applications where weight matters. Aluminium flashings can be left mill-finish or powder coated.
• Stainless Steel — the highest level of corrosion resistance. Used in demanding environments such as coastal properties, pool buildings, and industrial facilities where long-term durability is essential.

All steel and aluminium flashings can be powder coated to any RAL colour, Resene colour, Dulux colour, or custom colour matched from a physical sample. Our in-house powder coating means your flashings leave our workshop finished and ready to install — no need for a separate coating run.

We manufacture both standard profiles and fully custom roof flashings to any specification. If you need a standard ridge capping or barge flashing in a common size, we can fold it quickly from stock material. If your project calls for a non-standard profile — unusual angles, extended cover widths, specific drip details, or multi-fold sections — we fold to your drawing or sample. There are no minimum order quantities for custom work. Whether you need one piece or a full roof set, every flashing is made to the dimensions you provide.

Trade Supply for Roofing Companies

If you are a roofer or roofing contractor in Auckland, we are set up to supply your flashing needs on an ongoing basis. We understand that on a roofing job, you need flashings that are right first time, ready when promised, and consistent across repeat orders. That is how we operate.

Trade accounts are available for roofing companies with regular work. You will deal directly with our workshop team — no call centres, no intermediaries. Send through your cutting lists and we will fold and finish to your specifications. If you are running multiple jobs with the same profiles, we keep your details on file so reorders are straightforward.

We supply roofing flashings to contractors across Auckland and offer NZ-wide delivery for larger orders. Whether you are working on a single residential re-roof or rolling through a subdivision, we have the capacity to keep up. Get in touch to set up a trade account or discuss your next job.

How We Manufacture Roof Flashings

Every roof flashing we produce is folded in-house at our Onehunga workshop. We work from your drawings, sketches, or sample pieces. Material is cut to length, then brake-folded to the specified profile. Where powder coating or colour matching is required, flashings go through our coating line before dispatch. The result is a finished product ready for installation — no painting, no touch-ups needed on site. For a full overview of our flashing manufacturing process, see our custom flashings page. If you are new to flashings or want to understand where each type fits, our guide to flashings in NZ covers the essentials.

Related Flashings

Roof flashings work alongside other flashing types across your building envelope:

• Barge Flashings — for gable-end rakes on pitched roofs
• Apron Flashings — for roof-to-wall junctions at lean-tos, dormers, and chimneys
• Ridge Cappings — for the apex of pitched roofs
• Valley Flashings — for internal junctions where two roof planes meet
• Window Flashings — head, jamb, and sill flashings for window and door openings

Frequently Asked Questions