The supporting sub-structure forms the static connection between the structure and the façade cladding. Preferred materials used for the supporting system are metal and timber, or a combination of both. Basically a structural analysis for supporting system is required, this applies to new builds as well as to restoration works.
The structural-physical requirements must be taken into account. Fixings method and material is dependent on the material of the substructure, expected loads and fire safety requirements. The function and dimensions of the substructure should be verified on both new-builds and renovations.
Generally speaking, the structural stability analysis covers the supporting system, including anchors and connectors, as well as the cladding and its fastenings.
A verified span table is available for conducting a structural analysis of the siding, siding.X and perforated siding.
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
Tolerance for the sub-structure framework is limited to an inside micrometer of 2.5 mm for 3000 mm measuring distance or 1 mm for 1000 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. Color, gloss level and light incidence could intensify this effect.
Observe the recommended max. overhang for siding, siding.X and perforated siding as specified in the static requirements for unsupported corners/edges of max. one quarter of the substructure spacing.
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