PWD-PIR-100 - Roof sandwich panel - polyurethane foam - visible fastening

When designing, temperature differences between the claddings of sandwich panels must be taken into account. The temperature gradients resulting from the difference between the outdoor temperature_T1 and the indoor temperature_T2 depend on several factors:

• intended use of the facility (temperature range inside the facility –_T2)
• Location of the building—its orientation relative to the sun
• color of the exterior cladding (_T1).

Depending on latitude, elevation above sea level, and distance from the sea, four different winter temperature levels are used on the European continent (T1—exterior cladding):

• 0,^-10°C,
• 0,^-20°C, (e.g., Poland)
• 0,^-30°C(e.g., Scandinavian countries)

The temperature of the outer cladding for roof panels covered with a layer of snow is^0°C.

An outdoor temperature of -20 ^°Cduring the winter was used for the calculations.

The temperature of the exterior cladding,_T1, reaches its maximum value in the summer and depends on the color and reflectivity of the surface. The_T1 values, which are the minimum values for strength-of-resistance (SGN) calculations and are appropriate for serviceability limit state (SGU) calculations, are adopted as follows:

• Very bright colors:_RG = 75–90,_T1 = +55^_oC
• light colors_RG = 40–74_T1 =^+65°C
• dark colors_RG = 8–39_T1 =^+80°C

where_RG is the reflectance of the rays relative to magnesium oxide = 100%

The table below shows a classification by color group for the individual colors available in the Pruszyński Company product line.

• If you are picking up the goods with your own vehicle, the vehicle should have an open loading platform that allows for easy loading and unloading.
• “Manual” unloading should be performed by an adequate number of people; that is, for long sheets (approx. 6 meters), 6 people should be involved, 3 on each side, taking special care not to slide the sheets over one another, not to bend the side edges, and not to stretch them. Deformation of the sheets during unloading and handling causes subsequent problems with their proper assembly (gaps at the seams).
• The most appropriate method is to unload the goods in the manufacturer’s packaging using mechanical equipment.
• At the construction site, the sheets should be stored in their original packaging, under a roof. Storage under these conditions should not exceed 3 weeks from the date of manufacture. After this time, the packaging should be opened, and the sheets should be separated with spacers to allow for free air circulation. The maximum storage period should not exceed 6 months from the date of manufacture, under penalty of voiding the Warranty.
• Protective films are used to provide additional protection for coated sheet metal against mechanical damage, stress, and impacts that may occur during transportation, handling, or forming. Protective films never exempt the user from the obligation to properly secure the sheets during storage or to protect them from the harmful effects of chemicals during processing. It is recommended to gradually remove the protective film from the finished profiles, one piece at a time, before installing the wall and roof components on the building. The protective film should be removed from the sheet metal surface within three weeks of the sheet’s date of manufacture, provided the product is stored properly—that is, at a positive temperature, away from high humidity, and out of direct sunlight. Failure to maintain proper storage conditions may shorten the timeframe for removing the film to three days from the date of delivery.
• Improper storage can make it difficult to remove the protective film and leave adhesive residue on the sheets.

• To extend the service life of roofs and facades made of coated sheet metal, they should be inspected and maintained regularly.
• Inspection – Once a year (preferably in the spring), you should inspect the roof and exterior walls to detect any damage early on.
• Cleaning Metal Sheets – Roofs and facades made of coated metal sheets require cleaning at least once a year. Dirt that accumulates on the sheet metal can cause uneven discoloration (due to uneven exposure to UV rays) and reduce corrosion resistance (dirt traps moisture on the metal, gradually damaging it). Dirty and stained areas can be cleaned with a soft brush and water (max. 60°C). If necessary, a mild detergent may be added to the water (pH 6–7, max. 10% solution). Pressurized water (max. 100 bar) may also be used for cleaning; however, the water jet must not be directed too close to the sheet’s surface (min. 30 cm) nor perpendicular to the surface. At the joints, the water jet should be directed downward to prevent pressurized water from entering the gaps around the joints. Old coatings must be handled with extreme care. Cleaning should be performed from top to bottom, and the cleaned area must always be thoroughly rinsed with clean water immediately afterward.
• Do not use scouring powders, nitro solvents, chlorine-based solutions, aromatic cleaners, or products containing ammonium chloride (salmiak) or sodium salts.
• Damage — Any repairs to damage that may occur during the Warranty period should be discussed with the roof/facade contractor and may be performed only with the contractor’s approval. Repairs to small areas are performed using air-drying touch-up paints. Painting large areas is generally possible only with special industrial paints designed for the renovation of coatings. The area to be painted should be limited only to those spots that require it (scratches down to the metal layer, corrosion spots, etc.). Surface preparation for painting should be performed in accordance with generally accepted principles. Always thoroughly remove all traces of corrosion—preferably using special brushes or fine-grit sandpaper. Next, the surface to be repaired must be thoroughly dusted, degreased, and cleaned. To degrease the surface, you can use extraction gasoline or water with added surfactants (preferably with a 1–2% ammonia solution). The repaired areas may show color differences compared to the original sheet metal colors due to natural atmospheric effects (aging of the paint under the influence of UV radiation).
• Organically coated steel sheets must not be used in:
  • an environment in constant contact with highly saline water,
  • contact with construction chemicals, including concrete, plaster, wet wood, etc.,
  • in an environment exposed to harsh chemicals
  • in combination with materials having a different electrochemical potential
• CAUTION—Health and safety rules must be strictly observed during inspection, cleaning, maintenance, and repairs.
• Pruszyński Company is not liable for any accidents that may occur as a result of performing the above activities.