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In this video, energy consultant Klaus Michael from the Detmold Low Energy Institute explains how to retrofit thermal insulation to top floors made of wood. There is a parallel video for top floors made of concrete. It covers insulation qualities for winter thermal insulation and summer heat protection, the design variants of insulation in the cavity, top and bottom insulation, aspects of airtightness and moisture protection, possible insulation materials and current funding options from the tax office, BAFA and KfW (as of November 18, 2022).