PREFA aluminium extruded profiles may be used only at temperatures of –50 °C to +80 °C. 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. We recommend a gap of at least 10 mm.
Note
Expansion gaps in the substrate must also be applied to cladding.
Thermal expansion caused by fluctuations in temperature during inclement weather can have a negative impact on the appearance of the façade.
The thermal expansion coefficient of PREFA aluminium extruded profiles is 0.024 mm/m/°C.
Thermal expansion
Length of plate |
Expansion at a temperature difference of 60 °C |
Expansion at a temperature difference of 100 °C |
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 circular holes and slot holes must be defined clearly for each profile.
Depending on the length of the extruded profiles, fastening must be carried out 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.
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