Coated insulating slabs for façades and roofings based on mineral fibres, and method for their production

摘要

1. A coated facing panel or roof insulation panel of plastic-bonded mineral fibres, in particular rock wool, the coating of which is formed on the basis of an inorganic silicate-type binder and particulate inorganic additives, characterized in that the inorganic binder is colloidal silica (silica sol), that the coating (3) is composed of an impregnation layer (3a), which has been formed by pressing the coating composition into the resin-bonded mineral fibre panel with breakage of fibres in the superficial region of the mineral fibre panel and which has a thickness of one or more millimetres, and of a surface layer (3b) formed from the coating composition itself, and that the inorganic additives are at least largely free of electrolytes and of swellable layer silicates such as, especially, natural clays or clays, which are swellable as the result of activation, from the montmorillonite group.