Disclosed is a barrier material for heat insulation and / or sound insulation, which material has a number of layered sheets and is for a method of thermally and / or acoustically insulating a body (a method of heat insulation and / or sound insulation). Offer. A barrier material 10 for thermal insulation and / or sound insulation, comprising one or more flexible materials at least partially covered with reflective coatings 2a and 2b on one or both surfaces thereof. A heat insulating method and / or soundproofing method having a number of layered sheets 1 and 2 containing a certain polyimide airgel film. [Selection diagram] Figure 1
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