A sandwich wall system, i.e. a system with a heavy facade brick facing, requires previously designed and constructed supporting elements of the facing. The width of the steel ements must comply with the thickness of insulation material made of KnaufRock KR L stone wool, the air layer width (if it is a ventilated sandwich wall) and the thickness of the facade facing. The facade facing is tied to the supporting wall with special mechanical fasteners (anchors) which simultaneously serve for fixing stone wool slabs. With ventilated sandwich walls, these mechanical fasteners are also a measure of the distance between the stone wool slabs and the facade facing, thus providing a uniform width of the air layer. For the required number of anchors per one square meter, as well as for the anchoring length, consult the anchor manufacturer.
With ventilated sandwich walls, ventilation openings in the facade facing should be provided (all in accordance with the recommendations of the facing brick manufacturer), enabling vertical ventilation of the insulation material layer, at which air circulation must be undisturbed. With non-ventilated sandwich walls, it is particularly important that waterproof and vapour permeable materials are chosen for the facade facing, so that any condensed water vapour may dry out of the wall within a permissible time. In such a case, it is not necessary to place a vapour barrier, but only upon the confirmation of results obtained by calculation in accordance with applicable standards in the field of thermal technique in civil engineering. In other cases, a vapour barrier should be placed between the supporting wall and the insulation in order to avoid impermissible condensation in the insulation material.
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