Round rainwater systems are also available in a unique, genuinely dirt-repellent material. Supraflow is the choice for demanding and particularly maintenance-free use.


Superior durability and silky flow

Maximum durability and eye-pleasing, silky appearance all in one product. The SUPRAFLOW material was developed to meet the demands of the rainwater system market with a more innovative, durable and esthetically pleasing system at a reasonable price.

SUPRAFLOW combines all the best properties that can be required of a rainwater system. Thanks to its silky fluorine-containing surface, it repels dirt considerably better than any other material. UV radiation from the sun does not cause discoloration of the painted surface, and therefore the material has the highest RUV rating possible. SUPRAFLOW is also an excellent material in terms of formability and corrosion resistance.


Superior-quality Finnish material for rainwater systems

SUPRAFLOW is Piristeel Oy’s registered trademark in Europe and North America. SSAB manufactures the SUPRAFLOW material for Piristeel in Finland.


Alternative to zinc

Rainwater systems made from “titanium zinc” are sold in the market. Such systems are extremely expensive and difficult to form. SUPRAFLOW is a more affordable alternative with premium formability for everyone. SUPRAFLOW systems are installed in the same way as other premium rainwater systems. It does not require exotic components or work phases to take higher thermal expansion into account, for instance.


Promise of quality

SUPRAFLOW systems are manufactured under extremely stringent quality control. The compatibility of the components is top class, and the coating endures demanding molding without any defects. We want the system to work perfectly for decades to come. SUPRAFLOW is a superior product, and we provide it with the warranty it deserves.



  • Technical warranty for 50 years
  • Coating warranty for 25 years


  • 0,55-0,6 mm DX53D +Z350 SUPRAFLOW
  • 27,3 % thicker zinc layer
    Coated on both sides
  • 100% made in Finland


  • 125 mm, 150 mm ja 180 mm half-round gutters
  • 87 mm, 100 mm ja 120 mm downpipes
  • Complete range of components
  • Color: Matt Metallic Graphite (RR 41 matt))
  • The color is optimally suited for sites with ZN, RR 23, RR 33 or RR 41 shades


  • A silky coating with excellent dirt repellent properties
  • Supreme resistance to UV radiation
  • Excellent corrosion resistance
  • Excellent formability
  • 100% recyclable material

Rainwater systems


Round rainwater system

Kantikas sadevesijärjestelmä

K-style rainwater system

Tyylikäs ja likaantumaton sadevesijärjestelmä

Supraflow rainwater system

Sadevesijärjestelmän ylläpito ja huolto

Rainwater system maintenance

Rainwater systems and roof safety products

Rainwater systems

Pisko rainwater systems conduct rainwater off the roof and building structures in a controlled way. The most extensive range in the market includes options for all tastes in all roofing and facade colors. The GreenCoat RWS Pural-coated rainwater system components come with a technical warranty for 50 years.

Read more about Rainwater systems

Ladder products

Pisko SafeGrip, for a better grip. Pisko ladders provide safe access to roofs, the ridge of roofs, chimneys, roof hatches and other locations that require maintenance. The Pisko ladder range also offers solutions for a safe descent from balconies and upper floor rooms. The ladders are available in all roofing and facade colors. The Pisko SafeGrip ladder system comes with a technical warranty for 50 years.

Read more about Ladder products

Snow guards

Pisko snow guards are used to prevent dangerous situations that can be caused by snow and ice falling from the roof. Snow guards can also protect structures installed on the roof. Our range includes snow guards for all roofing materials. Painted Pisko snow guards come with a technical warranty for 50 years.

Read more about Snow guards

Roof walkways

A Pisko roof walkway ensures safe access to roof-mounted objects requiring maintenance in all conditions. The roof walkways are available in all roofing colors. The CE-marked roof walkway system has a technical warranty for 50 years.

Read more about Roof walkways

Safety equipment

Pisko safety equipment ensures safe access to the roof and moving to the maintenance sites on the roof. The safety equipment is available in all roofing and facade colors. Pisko safety equipment has a technical warranty for 50 years.

Read more about Safety equipment

Gutter coils and roofing sheet coils

Piristeel’s products include a wide range steel manufactured in Finland for various purposes. The raw materials are locally sourced and therefore an ecologically sustainable choice. We can deliver CE-marked 610 mm and 1250 mm roofing sheet coils and gutter coils on short notice from our warehouse.

Read more about Gutter coils and roofing sheet coils

Pisko Solar

Roof fastenings for solar panels are an important part of the Solar assemblies compliant with green energy values. We offer an effective range of tested and safe solar panel roof brackets that withstand northern conditions. Pisko Solar solar panel brackets are always treated using Qualicoat 1-compliant powder coatings, and the products come with a technical warranty for 50 years.

Read more about Pisko Solar

Pisko balcony fire hatch

The Pisko fire hatch is intended as an emergency exit route from the balconies of apartment buildings. The easy-to-use product ensures safe and fast evacuation from every floor of a high-rise building. All parts of the Pisko fire hatch have been treated using Qualicoat 1-compliant powder coats. The product has a technical warranty for 40 years.

Read more about Pisko balcony fire hatch

Pisko SafeLine wire system

NEW PRODUCT! Pisko SafeLine wire system takes safety to the next level!

Read more about Pisko SafeLine wire system

Pisko MultiFast

NEW PRODUCT! Pisko MultiFast is a fastening solution especially for low slope roofs.

Read more about Pisko MultiFast