Category: FAQs

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What is the cause of dripping of sandwich roof panels in potato warehouses?

The cooled potato store in this situation had approx. 8° C room air temperature at 95 - 98% relative humidity. The owner found that it dripped frequently in winter, particularly at the element longitudinal joint, FischerTHERM DL 120 elements with a U-value of 0.29W/m²K were used for the roof. Incidentally, the U-values contained in the company documents for sandwich elements do not take into account the minor thermal bridge influence of the longitudinal joint.....  Read more

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Does precipitation from roof and wall surfaces discharge zinc into the ground and is this harmful?

Environmental pollution caused by foreign substances and the question of their harmfulness is currently being widely discussed. This also applies to roof and wall elements made of zinc or steel sheet with zinc coating or a metallic coating of 55%AlZn (Aluzinc), without additional organic coating. One aspect here is the replacement of the corrosion products of zinc by weathering ....  Read more

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Why are the U-values different for almost identical sandwich panels?

All PUR rigid foams of sandwich panels have practically the same thermal insulation properties. The specific thermal conductivity l10tr measured in the laboratory is 0.21 to 0.23W/mK, depending on the foam quality and type of blowing agent. According to German regulations, this value must be increased by 10% due to the expected ageing of the foam, in order to then be classified in the next higher 5-group......  Read more

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Why do sandwich elements with a PUR core behave so positively in case of fire?

Planners and building owners often demand sandwich panels with a non-combustible mineral fiber core for more safety in case of fire. Sandwich panels with a PUR rigid foam core also offer sufficient passive safety in the event of fire. Because these panels do not contribute to the spread of fire. This means that the PUR rigid foam core is only destroyed where there is direct exposure to fire and high temperatures, e.g. by burning goods inside a hall....  Read more

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What should be observed for load-bearing trapezoidal acoustic steel profiles above indoor swimming pools?

During normal swimming pool operation and when using an air conditioning system, the air temperature is 22-28°C with a relative humidity of max. 60%. When the air conditioning is switched off, the relative humidity rises to 80 to 90%. If air conditioning is switched off frequently or for long periods of time, the trapezoidal profiles ....  Read more

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What is to be considered with the execution of horizontal corrugated profiles on inner horizontally lying cassette profiles?

Answer: All building authority approvals for liner tray profiles regulate the conventional design of a double-skin construction, whereby the outer skin consists of trapezoidal profiles that are directly connected to the narrow liner tray top flanges. In recent years, designers have been demanding horizontally or diagonally arranged corrugated profiles. In these cases, an additional spacer construction is arranged between horizontal liner tray profiles and horizontal corrugated profiles .....  Read more

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How to replace defective FischerTHERM plus panels?

Answer: The replacement of concealed wall panels is quite complex, but there are two common options. 1. the wall surface is dismantled in the opposite direction to the mounting direction up to the damaged panel. The damaged panel is replaced and all other dismantled panels are reinstalled. 2. the damaged panel and an adjacent panel are carefully dismantled with destructive effect. The screws must be ground off .....  Read more

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What is the origin of cracking noises in steel cladding on wooden substructures?

Antwort: Knackgeräusche treten vor allem durch Sonnenbestrahlung bzw. Abkühlung von leichten Dach- oder Wandbauelementen aus Metall statt, wobei diese Bauelemente selbst keinerlei Geräusche erzeugen. Aufgrund der relativ geringen örtlichen Festigkeit sind absolut ‘massive’ Anschlüsse bei Unterkonstruktionen aus Holz, z.B. zwischen Bindern und den eingehängten Pfetten oder Anschlüssen zwischen Stützen und Wandriegeln kaum möglich. Es sind ….  Read more