Heat-insulation building block of all-metal construction variable in size and having mutually spaced thermally displaceably mounted metallic insulation foils defining insulation cells therebetween together with spacer elements holding the insulation foils at a distance from one another, as well as metal housing sheets carrying and at least partly enclosing the insulation foils and the spacer elements, including at least two building block parts nested within one another with the metal housing sheets and the insulation foils thereof having a mutual convection-inhibiting sliding fit and, in sliding direction of the mutual sliding fit, the adjacently disposed insulation foils and metal housing sheets having respective overlap lengths greater than a predetermined maximum enlargement of the building block resulting from sliding apart of the building block parts in the sliding direction.
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