Why thin sheet metal?

Thin sheet metal is more than just a tough material with a long life expectancy. It’s also one of the few materials that can be recycled any number of times without losing its positive qualities. Thus thin sheet metal is a major asset in sustainable community building.

A natural choice

At Plannja, we use galvanized steel sheet in the majority of our products to help them stand up to harsh environments. And there’s a paint coating to provide extra protection. Plannja is a GreenCoat-partner, and the eco-friendly GreenCoat BT-coatings are chromate-free and based on natural oils from the plant kingdom.

Profiles and colours for everyone

Thin sheet metal is a flexible material that is easy to shape. This becomes apparent from our wide range of stylish roofing profiles to choose from. They are all available in a variety of inspiring colours taken from nature’s own palette. It’s easy to find a roof that suits you, your home and your surroundings. 


Thin sheet metal is a fantastic roof and exterior wall material. It has been used for hundreds of years to protect everything from churches to barns from the elements. In many of our cities, we can still see buildings with metal roofs dating back to the late 19th century. Their survival until today is not by chance. You’ll have to search far and wide for a building material with a longer life expectancy.

Ideal material

For many, the big advantage with our sheet products is that they are practically maintenance free. Only minimal effort is necessary for the roof to protect your home year after year. Because metal sheet is inorganic it does not bind moisture, which is great when you want to reduce the risk of things like moisture damage and fungus – yet another advantage. In other words, metal sheet is an ideal material for roofing and rainwater systems that you can rely on over time.

From tiles to steel sheet

In addition to being a very durable material, thin metal sheet’s light weight is a major advantage. Steel sheet exerts less of a load on a roof structure than clay or concrete tiles. This usually means you can switch to a metal roof without any problem. But remember, preparatory work must always be done properly no matter what type of roofing you choose.

OP Kouvola - Titus Verhe

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?

Reasons to choose aluminium

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