In the framework of the refurbishment process of the Rijksmuseum Amsterdam, it is intended to provide an adequate internal insulation of the exterior facades, which increases indoor climate quality, ensures hygric durability and reduces heat losses. This contribution shows the suitability of a capillary active internal insulation in order to distribute the interstitial condensation and the penetrated rain water. Foam glass prevents the drying potentials and leads to the destruction of the brick wall.