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Granite® HFX Cool Matt and Magnelis® take Bevego's standing seam roofs to the next level

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 family 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.

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.

Standing seam roofs are traditionally made on site using long strips of metal [Copyright: brizmaker / Adobe Stock, by courtesy of Bevego]

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.”

Today’s trend on the roofing market is to use colours such as black and dark grey [Copyright: ArcelorMittal Construction Sverige AB]

Standing seam roofs are ideal for buildings with a lot of chimneys or dormer windows [Copyright: Palatinate Stock /]

Steel construction products meet demands for buildings with a low environmental impact [Copyright: Palatinate Stock /]

The trend is to use colours such as black and dark grey, but red is in demand as well. In Sweden, the building’s rainwater management system is usually done in the same material and colour.

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.”


Environmental classifications key to Swedish market

Bevego works closely with ArcelorMittal’s subsidiary in Sweden. “We get excellent products and great support from ArcelorMittal Construction Sverige AB (Armat™) as our local partner,” says Johan Cronhamn. “Armat™ maintains good stocks of key steels. And from an environmental aspect, proximity is key.”

Armat™ also provides all the necessary environmental classifications for Granite® and Magnelis® products. “A low environmental impact and good supporting documentation are very important if a product is to be adopted by the Swedish market,” notes Johan Cronhamn. “Armat™ has everything we need. We expect the market for Granite® HFX Cool Matt and Magnelis® to grow quickly. They have the aesthetics and the environmental credentials we need for success.

Double standing seam roofs require flexible materials such as Granite® HFX Cool Matt [Copyright: UnitedPhotoStudio / Adobe Stock, by courtesy of Bevego]

Armat™ by ArcelorMittal

ArcelorMittal Construction Sverige AB is a subsidiary of ArcelorMittal in Sweden. The business produces sheet metal products for construction under the Armat™ brand. This includes steel roof and facade sheets, flooring, roof tiles, light beams, and complete systems for roof drainage and safety. Armat™ products are sold through a network of sheet metal wholesalers, DIY stores, and retailers across Sweden. 

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Copyright: ArcelorMittal Construction Sverige AB