Siding, siding.X and perforated siding may only be used at temperatures of –50°C to +80°C. Depending on the colour, the maximum expected surface temperature must be taken into account. Due to expansion of the material when exposed to temperature fluctuations, you must always pay attention to the arrangement of fixed and sliding points. There must be a gap in the profile joint to accommodate for thermal expansion. The width of this gap depends on the expected change in dimensions. However, a width of at least 10 mm is recommended or the use of a PREFA joint with a max. siding length of 2,500 mm.
Note
Expansion gaps between the rails must be taken into account.
Thermal expansion caused by fluctuations in temperature during inclement weather can have a negative impact on the appearance of the façade in the event of non-compliance with the dimensioning of fixed and sliding points.
The thermal expansion coefficient of the siding, siding.X and perforated siding is 0.024 mm/m/°C. 24×10-6 K-1.
Thermal expansion
Profile length |
Expansion at a temperature difference of 60° |
Expansion at a temperature difference of 100° |
|---|---|---|
2 m |
2.88 mm |
4.80 mm |
3 m |
4.32 mm |
7.20 mm |
4 m |
5.76 mm |
9.60 mm |
6 m |
8.64 mm |
14.40 mm |
Note
The fixed and sliding points must be defined clearly for each siding.
The sidings must be fastened using fixed and sliding points. Depending on the direction of installation, use only one circular hole per profile in the centre. The rest of the profile should be fastened to the substructure using slot holes.
Screw the fastening screw directly into the material between the elongated holes.
The fastening screw is fixed centrally through the pre-punched hole in the fastening strap into the support profile. If no pre-punched hole is placed directly over the supporting rail, a punching tool should be used to make an elongated hole to allow unobstructed expansion, for example, in order to enable tension-free expansion of the siding.
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