The Rudolf Steiner Archive moved into the premises of "Haus Duldeck" in 2002. New storage rooms had been specially built to provide a safe environment for the preservation of Rudolf Steiner's literary and artistic estate, to ensure optimal conditions following cultural heritage standards. By the use of dehumidifiers and professional thermo-hygrometers monitoring a constant temperature (20 °C) and humidity (50%), we provide appropriate climatized conditions. To illustrate our concern, we use carefully chosen furniture, designed for archives, like rolling shelves and storage materials that can offer the best conditions to preserve our holdings from decay. Following international standards, specifying necessary requirements for the storing and preservation of documents, we employ acid free paper and cardboard storage boxes, envelopes and other containers to protect our material.