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Materials for interior insulation

Insulation materials open to diffusion (e.g. those based on minerals or plants) make sense here, to avoid moisture collecting and mould developing within the insulation, since moisture can escape. For plasterwork, too, materials open to diffusion must be used (e.g. clay or lime plaster).

Reed and lime plaster can be used for interior insulation open to diffusion (source: GrAT)

Interior insulation with panels open to diffusion (source: ISOTEC GmbH)

If materials not open to diffusion are used, an airtight vapour barrier has to be installed on the inside.