The cavity between the outer façade cladding and the insulation and base layers behind it is also known as the rear ventilation room. This layer of air is flowed through by the outside air and is a characteristic feature of rear-ventilated facades (e.g. natural stone, concrete) or facing wall shells.
In this case, the outer clothing can become soaked in the event of rain. The rear ventilation ensures that the cladding or facing wall shell is completely dry.
VHF are regulated in DIN 18516 Exterior wall cladding, rear-ventilated.
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Rear-ventilated façades (VHF), synonymous with "exterior wall cladding, rear-ventilated", represent a high-quality and extremely versatile option for façade design.
What they all have in common is the structure of an insulating layer, substructure/rear ventilation and the actual façade cladding.
The increased space required by a VHF, for example compared to a façade with an external thermal insulation composite system (ETICS), should be taken into account at an early planning stage.
In addition to the decision for the final surface material of the VHF (see table), and the associated individual design possibilities, the appearance is decisively determined by the determination of shape/format (e.g. panels, panels, panels, rhombuses, squares – each changing evenly or regularly/irregularly), colour, surface (e.g. structured, pre-patinated, milling/perforation, sanded, graffiti protection), joint (e.g. staggered joints, cross-joints), fastening (visible/invisible) and laying pattern (e.g. open/closed joints, inverted).
Image: Schematic sketch of the rear-ventilated façade - bauwion
System: Façade cladding, substructure and insulation must be approved for installation as part of a rear-ventilated façade (VHF). The compatibility and compatibility of the various components with each other must be checked.
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Source: bauwion
