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Zwinger of Dresden:
Rehabilitation and insulation of the Royal Cabinet of Mathematical and Physical Instruments

The Zwinger belongs to Germany's most well-known Baroque monuments. It accomodates art collections and museums and is presently fundamentally rehabilitated. In the Royal Cabinet of Mathematical and Physical Instruments the responsible persons decided to apply calcium silicate boards as an interior insulation. Since 1728, the Cabinet accomodates an exhibition of precise mechanical instruments and the reopening is planned for spring 2013.

The Staatsbetrieb Sächsisches Immobilien- und Baumanagement (SIB) opted for an energy-efficient rehabilitation with calcium silicate boards for the following main reasons: Energy saving and avoidance of mould formation. As everybody knows, sandstone has a low insulating value and by means of insulating the sandstone building, the future energy costs shall be reduced. Besides, the condensation on the sandstone walls also hold the risk of mould growth. To avoid damages due to moisture in the long term, a pure mineral building material system will be used. In some sections of the Royal Cabinet of Mathematical and Physical Instruments as well as in the neighbouring utility rooms more than 450 m2 of epatherm boards with an average thickness of 50 mm have been consumed.

Mounting of the interior insulation system

Firstly, the employees of the Augsburg C. Bau GmbH, Dresden, levelled the existing unevenness of the walls with the lime cast 'mpm1'. Secondly, the all over primary coated calcium silicate boards were mounted to the inner surfaces of the outer walls and to the ceilings by using the appropriate system adhesive. The careful and high-quality carrying out of the work could be guaranteed by the epasit service on site. As a finish, the inside filler 'multi-eti', which is a double-ply filler with embedded system reinforcement lattice, was used. Thus, the original appearance of the plastered surfaces could be maintained as desired.

Rehabilitation of the Cabinet

The Royal Cabinet of Mathematical and Physical Instruments is one of the four corner pavilions of the Zwinger, which are connected by arch galleries. Faun consoles decorate the facades of the arch galleries in the area of the basement. Between the Cabinet and the remarkable 'Crown Gate' lies the gallery 'Langgalerie' O. In the building sections 'Bogengalerie' K, 'Grottensaal', 'Langgalerie' O and Pavilion F, the inner surface of the outer walls of the wall arches above the windows, as well as the reveals of the big windows made of wood-profiles, have been rehabilitated in an energy-efficient way. For the semicircular arch of the windows an exact cut was necessary. Between the boards and the window frames the
masons mounted an open-pored sealing tape, thus, damages caused by moisture and the so-called 'fogging' effect, are avoided in the long term. Despite filigree cuts some areas decorated with stucco elements could not be fitted completely with boards. As agreed with the supervision of works, the junctions have been levelled by the masons with climatic plaster.

Rehabilitation of the utility rooms

The 'outbuilding R' represents the neighbouring utility rooms from the 1920s, which were built from a mixed brickwork of a thickness of 60 cm. The walls were rehabilitated in the same way like the Cabinet, the ailing plaster was removed, the walls newly plastered and insulated with calcium silicate boards. The boards apply to the standard specifications of the fire classification A1 and are thus non flammable. In the ceiling area, the boards have been glued and plugged; because of the fire regulations, the masons used insulation anchors in stainless steel. To avoid thermal bridges, the dowel-holes have been closed with cut out of epatherm boards, the so-called 'energy-efficient encapsulations'. The ceiling partly consisted of uneven concrete boards, therefore the masons first created a level surface with the help of a plaster reinforcing mesh made out of stainless steel and then plastered it with lime cement facing.

Precise mechanical miracles

Monarchs interested in technique collected for centuries mathematical and physical instruments as well as mechanical mechanisms of musical boxes. Because of this, as a part of the royal Saxon art collections, the Royal Cabinet of Mathematical and Physical Instruments was created in the Zwinger . The show-pieces include the astronomical clock or the world clock. The astronomical clock was constructed in the 1950s and shows, according to the time, the position of the planets, Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn. The world clock developed around 1690 by Andreas Gärtner, shows with the help of the gravity, the time of 365 places around the world . After the rehabilitation, these and many other 'miracles' of the precision mechanics can presumably be visited from April 2013 onwards.

Good for structure and climate

The epatherm system is authorized by the legal authority for construction and is frequently applied in the field of preservation of monuments. Up to now, the epasit GmbH was the only producer willing to allow its complete indoor climate board system to be analyzed according to the strict requirements of the Sentinel-Haus Institut and it fulfils these without restrictions: All components have been classified as components which show no risks for health and no allergen risks.

Presse contact:
epasit GmbH Spezialbaustoffe
Peggy Wandel
Sandweg 12 - 14, D-72119 Ammerbuch-Altingen,
Tel +49 (0) 7032 2015-0, Fax +49 (0) 7032 2015-21




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+49 (0)7032 - 20 15-0

Project management

Holger Trepte

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