• A minimum coating mass of 240gsm 
  • Delivers more durable site performance than normal unpainted or painted products
  • Suitable for severe environments
  • Scratch, impact, heat and humidity resistant
  • Applied to Stramit materials by New Zealand-based Pacific Coil Coaters (PCC)

Available in the following range of colours to suit individual applications.

Off White

Armour Grey



Slate Grey

Stramit's roofing and wall cladding, guttering, downpipes and fascia products are available in MagnaFlow® coating.

Where to Buy

Stramit account holders can buy MagnaFlow® coated Stramit steel products from their local Stramit office. We do not sell direct to the public but our products are stocked by retail outlets across Australia.

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This product is available Australia-wide. Lead times may vary depending on location.

News and Case Studies

Check out Stramit’s latest news, product releases and updates, and case studies featuring our quality Aussie-made steel products.

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Stramit helps deliver Queensland’s first mega cruise ship terminal

Queensland will soon have its first mega cruise ship terminal, using Stramit quality products.

The new $177 million Brisbane International Cruise Terminal will have purpose-built facilities to accommodate some of the world’s largest cruise vessels, including mega ships such as the Royal Caribbean International's 293m-long Radiance of the Seas.

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corrosion resistance roofing and wall cladding commercial sport & leisure structural qld
General Information close-medium-white

MagnaFlow® coated steel should not be installed in contact with non-galvanised steel, copper, brass, lead, stainless or monel metal. Do not use lead flashing with MagnaFlow® products.

If nestable profiles become wet while closely stacked, formation of wet storage stain or ‘white rust’ is possible. To minimise the possibility of inadvertent damage:

  • Inspect deliveries on arrival. If moisture is present, individual sheets should be dried immediately with a clean rag and then stacked and filleted to allow air to circulate and complete the drying process.
  • Well ventilated storage is essential. Always store metal products under cover in clean, well-ventilated buildings.
  • Cross stack or fillet sheets where outside storage is unavoidable and make provision for a fall to allow water to run off.
  • Cover the sheets.

The coating on the steel substrate complies with the coating classes as specified in AS 1397 – 2011: Continuous Hot Dipped Metallic Coated Steel Sheet and Strip – Coatings of Zinc, and Zinc Alloyed with Aluminium and Magnesium.

MagnaFlow® and MagnaFlow® X products are not suitable for use in the following situations:

  • for water tanks or areas where a constantly wet environment is maintained
  • in direct contact with concrete or where lime deposits are evident, or
  • in contact with soil (allow a 75mm run off below cladding sheets to ground level).
Technical Information close-medium-white

Magnaflow® products under normal well washed conditions of exposure, can be expected to show no cracking (other than that which may occur during forming), flaking or peeling of the paint film for 15 years from the date of installation. Colour change during service will depend on the colour chosen, aspect, design of the structure and the environment.

Class 5 coated screws will give the best service life with MagnaFlow® products.

Do not use stainless steel or monel fasteners on MagnaFlow® products. For further details refer to the SA HB 39:2015 Installation code for metal roof and wall cladding or contact your local Stramit office.

The MagnaFlow® painting systems are applied by Pacific Coil Coaters (PCC) in New Zealand, using the most up to date painting technology. PCC, like Stramit, is part of the Fletcher Building Group.


The primer is a flexible corrosion resistant chromated primer, with a nominal film thickness of 7μm ± 1μm on the top side, and 5μm ±1μm on the reverse.

Finish Coat

The finish coat can be a flexible acrylic, polyester or modified polyester coating, with a nominal film thickness of 18μm ±2μm.

MagnaFlow® X

For applications where there is a high risk of deterioration from corrosive elements, such as severe marine or industrial sites, then the MagnaFlow® X paint system could be suitable. The MagnaFlow® X paint system uses the same substrate, but comes with a more durable surface finish.

The finish coat is a Polyvinylidene Fluoride (PVDF) paint system of nominal film thickness 20μm ± 2μm, containing at least 70% resin in the dry paint film.


The backing coat is a Shadow Grey (standard colour) wash coat 5μm ±1μm. Gloss levels are 25% ± 5% measured in accordance with ASTM D523 – 14 (60 degrees). Products can be supplied with an optional strippable film at extra cost. This material has a relatively short life span when exposed to sunlight and weather. It should be removed either just before or immediately after installation.

To ensure appropriate quality products are used in construction, comprehensive specifications from Stramit's relevant Product Technical Manuals should be included in the design documentation, including reference to MagnaFlow® material.

Installation Information close-medium-white

Installation of MagnaFlow® painted products uses the same installation details for the equivalent standard Stramit product.

Please refer to the SA HB 39:2015 Installation code for metal roof and wall cladding for correct installation guidelines, particularly in regard to underlays/building papers, penetrations, flashings, fasteners and pitch.

Where sealed joints are required, use only neutral cure silicon rubber sealant together with mechanical fasteners such as aluminium rivets. Do not weld or solder.

Magnaflow® is a baked on paint system which has different weathering characteristics to standard air drying paints. Do not use touch-up paint on Magnaflow® products.

Maintenance Information close-medium-white

The service life is extended by regular washing. A mechanical wash every six months is recommended, more often if contaminants build up. At these times inspect for damage and failing fasteners, and repair these.