For more than 40 years, Plannja has refined steel for roofs in Sweden and abroad. We have developed resistent roofing solutions and roof parts, which withstand everything from sliding ice sheets to extreme differences in temperature.

Hand in hand with the technical development, Plannja’s design development is continuously ongoing. What other material than sheet metal can offer 19 colours and half a dozen different profiles?

Steel or Aluminium

Plannja’s roofs consist of a core of hot galvanised steel or of aluminium. In addition, several protective layers and coatings make Plannja largely a maintenance-free alternative. The low weight of the Plannja roof is gentle on the person laying the roof and for the roof construction itself. A concrete tile roof weighs ten times more than Plannja’s tin roof and 20 times more than our aluminium roof.


Aluzinc keeps corrosion at bay. Zinc helps protect exposed edges and scratches in the surface by so-called cathodic protection, while aluminium provides its excellent resistance to corrosion. Aluzinc is often used for its unique look. Initially, the metal has a glossy surface which, over time, is patinated and thus protects the metal while giving it a beautiful shimmer of grey.



ZincMagnesium is a dynamic material that we use for rainwater systems and sheet metal work. A metallic top layer consisting of magnesium, aluminium and zinc creates a thin layer of magnesium oxide that provides the material with excellent protection against corrosion. ZincMagnesium will patinate quickly, already after 6 months the material has acquired a darker shade, depending on the sorroundings. Zinkmagnesium will heal itself in cuts and perforation, and it is possible to paint the surface if so desired.


Steel or Aluminium?

Plannja roofs consist of a core of hot dip galvanized steel or aluminium. We then add a number of protective layers and coatings which make Plannja more or less a maintenance-free alternative. A Plannja roof’s low weight benefits both the person laying it and the actual roof structure. A concrete tile roof weighs more than ten times as much as a Plannja-steel roof and 20 times more than our aluminium roofs. Aluminium and steel share many advantages compared to other exterior wall materials.

When should I choose aluminium over steel?

Rain and damp in coastal environments, big cities and close to industries, may contain salt or acid pollutants with low pH values. In such surroundings roofs and walls are exposed to great stress in the form of corrosion. Plannja’s series of profiled aluminium roofing and wall cladding has exceptional tolerance to salt and acidic oxides and is therefore an excellent choice for roofs and walls in aggressive environments. If aluminium sheet suffers a scratch or other damage, an oxide layer is immediately formed on the exposed surface. This means that the aluminium actually repairs itself and always protects against corrosive attack – whether or not the sheet has a protective paint finish.

Aluminium’s main advantages include low weight and the ease with which it can be processed. 

Advantages of roofing sheet

Aluminium and steel have several shared advantages compared to many other roofing materials. 

  • Low weight. A concrete tile roof weighs more than ten times as much as a Plannja steel roof and 20 times more than our aluminium roofs.
  • 100% Recyclable
  • Non-organic; does not bind moisture
  • Requires minimal maintenance
  • Long-lasting
  • Easy to work

Materials for your environment