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In this video, energy consultant Klaus Michael from the Detmold Low Energy Institute explains how to subsequently insulate external walls with a 6-8 cm wide air layer. There are parallel videos for other types of external wall construction. Variants of insulation in the cavity and/or from the outside or inside, recommended insulation qualities, suitable insulation materials and the funding options from the tax office, BAFA and KfW are explained (as of August 1, 2022).