PURLAK ® – PU50

Maintenance and washing

In order to extend the service life of roofs and facades made of coated metal sheets, they should be regularly inspected and maintained.

• Inspection –  Once a year (preferably in spring), the roof / facade should be inspected for early detection of possible damage.
• Sheet cleaning – Roofs / facades made of coated sheet metal require cleaning at least once a year. Dirt settling on the sheet can cause uneven discoloration (the result of uneven exposure to UV rays), as well as reduce corrosion resistance (dirt retains moisture on the sheet and gradually damages it). Dirty and stained places can be cleaned with a soft brush and water (max. 60 ° C). If necessary, it is allowed to add a mild detergent to the water (pH 6 ÷ 7, max. 10% solution). Pressurized water (max. 100 bar) can also be used for cleaning, however, the water jet should not be applied too close to the sheet surface (min. 30 cm), and should not be directed perpendicularly to the surface. At the connectors, the stream of water should be directed downwards so that to prevent pressurized water from penetrating the gaps around the fittings. Old coatings should be handled with extreme care. Washing should be carried out from the top downwards and the cleaned area should be immediately and thoroughly rinsed with clean water.
• Scouring powders, nitro solvents, chlorine solutions, aromatic agents as well as agents containing ammonium chloride or sodium salts must not be  used.
• Damage – Repairing any damage during the warranty period should be consulted with the roof / facade contractor and may only be performed with his approval. Damage to small areas is repaired with air-drying repair varnishes. Painting large areas is, in principle, only possible with special industrial paints suitable for renovation of coverings. The surface to be painted should be limited only to the places that require it (scratches to the metal layer, corrosion centers, etc.). Preparation of the surface for painting should be carried out according to generally accepted rules. Any signs of corrosion should always be thoroughly removed – preferably with special brushes or fine sandpaper. Then, the surface to be repaired must be thoroughly dusted, degreased and cleaned. To degrease the surface, you can use gasoline or water with the addition of surfactants (preferably with the addition of 1-2% ammonia solution). The areas to be repaired may show differences in color compared to the original colors of the sheets due to the natural influence of atmospheric phenomena (aging of the paint under the influence of UV radiation).
• Organic coated steel sheets must not be  used in:
  • environment with constant contact with water with a high degree of salinity,
  • contact with construction chemicals, including concrete, plaster, wet wood, etc.,
  • in an environment exposed to aggressive chemicals
  • combination with materials with a different electrochemical potential.
• ATTENTION – During inspection, cleaning, maintenance and repairs, safety rules must be strictly adhered to.

The colors below may differ from reality.