Across Europe, standing seam roofs are a key feature in the landscape of many cities and towns. Made from flexible metals, they are an ideal solution for the odd-shaped roofs of apartment blocks and public buildings where every millimetre of space under the roof is utilised. The standing seam provides a high level of resistance to wind and excellent watertightness, making it a popular roofing solution today. Organic coated steels such as the Granite® HFX Cool range from ArcelorMittal Europe – Flat Products offer the necessary pliability, combined with a hard-wearing finish that is guaranteed for up to 20 years. Bevego, a leading provider of roofing solutions and equipment for the Swedish market, recently started utilising the latest product in the range – Granite® HFX Cool Matt.

Standing seam roofing

Traditional standing seams are formed from strips of metal which are laid vertically down the roof. The standing seam is formed by bending up the edge of a strip and folding it over, together with the edge of the neighbouring strip. The result is a double standing seam which is totally weatherproof.

Roofing complexity demands ductility

“To achieve the double standing seam, roofers need flexible materials,” says Johan Cronhamn, business area manager for Bevego. “For complicated roofs with lots of dormer windows and chimneys, the work has to be done on site and at height. Granite® HFX Cool Matt handles well and can be formed at temperatures down to -10°C – a key consideration when it comes to the Swedish climate!”

Traditionally, standing seam roofs were made with copper and zinc – metals which are initially bright but become duller over time. In the early 2000s, materials with a gloss finish became more popular. Over the last few years, the market has switched back, explains Johan Cronhamn: “There is a strong preference now for low-gloss roofing. The steel is bent and pressed into shape on the roof and the matt colour disguises any minor marks. That is another reason for the growing popularity of Granite® HFX Cool Matt.”

Magnelis® – the new material for standing seams

Bevego has also been working with a sister company to develop roadside safety equipment out of Magnelis® coated steels from ArcelorMittal. From autumn 2021 they will start to use Magnelis® for standing seam roofs. “Architects like the patina that darkens over time, and Magnelis® has minimal reflectivity, making it suitable for low buildings,” says Johan Cronhamn.

“The Magnelis® we use in roadside applications has a thickness of around 3.0 mm, and it is able to withstand the very corrosive effects of road salts,” notes Johan Cronhamn. “In roofing applications, we will use it in a thickness of 0.6 mm. That will provide the material flexibility roofers need, and long-term protection against corrosion.”

About Bevego

Bevego is a leading provider of sheet metal, ventilation systems, and equipment for roofing and industry applications. Based in Sweden, the company operates more than 30 retail outlets, a steel service centre, and four plants which produce ventilation systems.

Text:
ArcelorMittal Europe Communications
Constructalia

Images:
brizmaker / Adobe Stock by courtesy of Bevego
Palatinate Stock / Shutterstock.com

A report from the Steel Construction Institute (SCI) describes their independent review of the performance of the Magnelis® ZM120 coating for corrosion protection. An innovative metallic coating that offers protection in the harshest environments, Magnelis® is a ZM (zinc-aluminium-magnesium) coating in accordance with EN 10346:2015.

Review of Magnelis® coating performance as corrosion protection

The SCI report details the performance of Magnelis® ZM120 coating against corrosion compared with traditional Z275 coating and includes the surface, cut edges, deformed elements, and welded tubes. This independent review and assessment was conducted via a wide range of testing, such as salt-spray tests according to ISO 9227, cyclic tests VDA 621-415 and ECC1, and outdoor exposure tests of up to 10 years.

Conclusions and recommendations

As a result of the performance review and assessment of research information, the SCI findings are as follows:

• Magnelis® ZM120 provides corrosion protection which is not less than the corrosion protection provided by Z275 coating.
• This conclusion applies to surface protection and to protection of cut edges.
• Magnelis® ZM120 is suitable for the same applications as the Z275 coating which is typically specified in UK and Irish construction.
• The design life predictions for the Z275 coating as stated in SCI publication P262 are also applicable to Magnelis® ZM120.

Magnelis® ZM120 applications

While the primary application under consideration was the use of Magnelis® on cold formed sections used in light steel framing, Magnelis® ZM120 is already widely used to manufacture cable trays, flooring systems, indoor ventilation equipment, ceilings, walls and partitions, racking systems, profiled members, and opened and closed profiles.

Magnelis® can be applied to an extensive scope of steel grades, including steels for cold forming and deep drawing applications, as well as structural and high strength, low alloy steels.

About SCI

The Steel Construction Institute has been a trusted, independent source of information and engineering expertise globally for over 30 years. SCI is a leading, independent provider of technical expertise and a disseminator of best practice to the steel construction sector.

The SCI supports everyone involved in steel construction from manufacturers, consulting and design engineers, architects, and product developers to industry groups and peers.

Text:
Constructalia
ArcelorMittal

Images:
SCI
ArcelorMittal

Related link(s)

Review of Magnelis® coating performance as corrosion protection by the Steel Construction Institute

Also known as the Dutch Vault, the Royal Dutch Mint in Houten in the Netherlands is one of four buildings shortlisted in the Best Industrial & Logistics Development category for the 2021 MIPIM Awards. The exquisite facade for this iconic building displays high-gloss Granite® Silky Shine from ArcelorMittal Europe – Flat Products.

MIPIM Awards: an internationally-renowned real estate competition

Since 1991, the MIPIM Awards have been honouring the most formidable and impressive projects in the world of real estate. The 2021 judges have shortlisted 50 finalists representing outstanding projects in 12 categories. It is now over to the MIPIM delegates to finalise the winning projects in each category. The winners will be selected with delegates’ votes carrying equal weight with the jury’s votes and will be announced at the MIPIM Awards ceremony on Wednesday 8 September, 2021.

Facetted cladding with Granite® Silky Shine

The exterior of the Royal Dutch Mint building resembles a safe with almost no visible opening. The unique design was inspired by the relief particular to the euro coins minted in the Netherlands. The cladding of this golden facade is made up of profiled and prepainted steel sheets (Isis 55-120/7 triangular profiles fabricated by ArcelorMittal Construction using prepainted Granite® Silky Shine Gold 50µm steel from ArcelorMittal Europe – Flat Products) which have been placed in different directions with the vertical and horizontal layers coming together to form the facetted facade. The Granite® Silky Shine facade is attached to the concrete building using a substructure made with Magnelis®, also from ArcelorMittal Europe – Flat Products.

Text:
Constructalia

Images:
SWAD Video
LT Photography