Stramit's roofing and wall cladding, guttering, downpipes and fascia products are available in MagnaFlow® coating.
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:
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:
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.
The finish coat can be a flexible acrylic, polyester or modified polyester coating, with a nominal film thickness of 18μm ±2μm.
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 aprpopriate quality producted 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 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.
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.