The supporting sub-structure forms the static connection between the structure and the façade cladding. For the supporting substrate, metal and timber materials can be used, or a combination of both. In principle, the supporting substrate should be calculated and dimensioned for the specific building. The structural-physical requirements must be taken into account. The fastening system to use for the sub-structure framework depends on the different supporting structures and the loads encountered, as well as on fire protection requirements and the building class. The function and dimensions of the substructure should be verified on both new-builds and renovations.
Generally speaking, the stability verification consists of calculating the static load of the sub-structure framework, the cladding and the anchoring elements and fasteners. A bearing distance table is available for working with PREFABOND and can be used to determine the supporting substrate distance and calculate the static load.
Insofar as valid standards, permits, local building codes or other technical policies in the static requirements do not correspond to smaller spacings, PREFA recommends choosing a substructure spacing (X) of between 500 and 800 mm.
Note
Please note that even if installation has been executed according to PREFA instructions and quality requirements, canning (oil canning) might occur due to a temperature change based on the nature of the metal. Colour, gloss level and light incidence could intensify this effect.
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