Category: FAQs

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Are one-piece substructures, e.g. Z-profiles for wall coverings permissible?

If the solid wall is sufficiently level, one-piece substructures can be used. However, it should be noted that each trade must or may move within the respective permissible tolerances. So carcass works have relatively large permissible tolerances. If the solid wall to be cladded consists of masonry, a permissible unevenness of 10mm applies in accordance with DIN 18202, Table 3, Line 5 "Non-surface finished walls and undersides of ceilings ......  Read more

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What must be observed when handling galvanized and alloy-galvanized components?

Zinc is an excellent corrosion protection for steel. Galvanized construction elements are also used in building construction where corrosion stress due to weathering or other moisture influences is to be expected. Nevertheless, even when exposed to moisture without sufficient air supply, the galvanized surface is still subject to certain corrosion attacks which, under unfavorable circumstances, can lead to premature corrosion. The understanding of these processes is especially important when storing and transporting components in packages....  Read more

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Are sealing tapes required for roofs with longitudinal joints? How tight must a roof covering be?

1. Fischer Trapezprofile als Dachdeckung Die Mindestdachneigung von Dachdeckungen aus Trapezprofilen sollte ohne Querstöße und Dachöffnungen 3° und mit Querstößen und Dachöffnungen 5° nicht unterschreiten. Im Teil 3 der DIN 18807 ist unter Punkt 4.9.3 ‘Niederschlag’ sehr allgemein vermerkt, wie das Eindringen von Wasser bei Dach- und Wandsystemen durch geeignete Maßnahmen dauerhaft zu verhindern ist. ….  Read more

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Which nominal coating thickness is required to achieve corrosion protection class II ?

In DIN 18807-1 (trapezoidal profiles in building construction - steel trapezoidal profiles) from June 87, tables 1 and 2 list the required corrosion protection classifications for both sides of the trapezoidal profiles when used in various building systems for roof, wall and ceiling. The side of the trapezoidal profiles that must have corrosion protection class I, II or III ....  Read more

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Upper or lower chord fastening for trapezoidal roof profiles, which is better?

Steel substructure: Bolted through the bottom chord: Stainless steel screw with sealing washer ³ Ø 19mm, non-positive connection between trapezoidal steel profile and substructure, high contact force possible to generate sufficient contact pressure of the washer with vulcanized-on neoprene seal, inexpensive short stainless steel screws, screw connection through the upper belt....  Read more

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What corrosion protection class must building elements of canopies have on the underside?

According to DIN 18807, part 1, corrosion protection class II is sufficient for the underside of trapezoidal steel profiles, this is e.g. a 12µm thick polyester coating on top of a galvanised layer. Since the underside of canopies are not subject to any precipitation and thus washed off like normal exterior walls and roof surfaces, aggressive, acidic dirt settles over time. The same applies, by the way, to wall surfaces under canopies that are not exposed to precipitation....  Read more

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What should be observed when cleaning and repairing coated surfaces?

Cleaning: In spite of all care taken, occasional soiling of the surfaces, especially on the building site, cannot be avoided. In order to keep the additional effort to a minimum, our customers should already consider a few points during installation: Extreme care during work, avoid soiling and damage to the coating layer, especially when lifting it from the stack. Leave the protective film on the construction elements during assembly, but remove it immediately after completion of the work or at the latest 4 weeks after delivery. Remove drilling chips immediately, thus avoiding rusting under the influence of moisture. Remove dirt before it dries (especially tar and bitumen) ....  Read more

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What has to be considered when applying the new version of DIN1055:2007 ?

DIN 1055 - Actions on structures - is of decisive importance for the application and dimensioning of our thin-walled construction panels. From 01 January 2007, the new load standard DIN 1055 was introduced nationwide, replacing the existing standard. As part of the progressive conversion of DIN standards into European standards, DIN 1055 was also completely revised.....  Read more

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What is chalking and how does it develop?

Antwort: Kreidung, auch Auskreidung genannt, Glanzverlust und Farbtonveränderung enstehen durch langjährige Bewitterung und beeinflussen das Erscheinungsbild einer bandbeschichteten Oberfläche von Bauelementen. Die unterschiedlichen Lacksysteme kreiden alle, jedoch unterschiedlich schnell aus. Zum Beispiel kreidet eine einfache Polyesterbeschichtung (SP) deutlich schneller aus als eine wesentlich teurere Polyvinylidenbeschichtung (PVDF) mit einem hohen ‘Kynar- Anteil’ von 70 oder 80 ….  Read more

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Unevenness in wall panels with wide upper flanges

Je breiter der Obergurt eines Wandelementes ist, wie z. B. beim FischerPANEEL desto exakter muss die Unterkonstruktion ausgerichtet sein. Sogar eine in der Ebene ausgerichtete Unterkonstruktion, bei der aber die Flansche verdreht sind, bringt unter Umständen Probleme. Solche Unterkonstruktionen können zu Längswellen in den breiten Gurten der mon-tierten Paneele führen. (Bild 2 und 3) Wenn ….  Read more