Restoration of the “ash books” in the Anna Amalia Library

Building design

The Anna Amalia Library in Weimar burned down in 2004 and with it precious books. Restoration work has been underway ever since. Photo: Brigitte Becker-Ebenau © Klassik Stiftung Weimar

Twenty years after the devastating fire in the Anna Amalia Library in Weimar, the Klassik-Stiftung Weimar has made significant progress in restoring the books and writings damaged by the fire. So far, 1.1 million pages of the so-called “ash books” have been restored in a complex process. By the end of the planned restoration work, 1.5 million pages are to be restored – a fraction of the total of seven million pages that were damaged by the fire. […]

Twenty years after the devastating fire in the Anna Amalia Library in Weimar, the Klassik-Stiftung Weimar has made significant progress in restoring the books and writings damaged by the fire. So far, 1.1 million pages of the so-called “ash books” have been restored in a complex process. By the end of the planned restoration work, 1.5 million pages are to be restored – a fraction of the total of seven million pages that were damaged by the fire.

The fire on September 2, 2004 not only destroyed the attic and the second gallery of the historic library building, but also destroyed a total of 50,000 books and 35 paintings from the 16th to 18th centuries. The famous rococo hall of the library, which is the heart of the building, was not left unscathed either. A total of 118,000 books were damaged, while 28,000 volumes were recovered intact from the Rococo Hall. The damaged books were recorded in various categories, with the 25,000 volumes rescued from the fire debris being referred to as “ash books”. Due to their severe soot, smoke and heat damage, these fragments are a central symbol of the preservation of the library’s cultural heritage. Since 2008, they have been restored in a long-term restoration project. The “ash books” comprise a total of around seven million individual sheets, of which 1.5 million sheets are earmarked for restoration.

The extent of the damage was considerable. Of the 118,000 damaged books, 56,000 had heavy soot, smoke and pollutant damage. A further 62,000 books were damaged by fire, heat and extinguishing water, including 37,000 volumes with binding damage. Many of these books are irretrievably damaged, but the majority have been restored. Between 2004 and 2018, all 56,000 soot and smoke-damaged books were cleaned, decontaminated and conserved. Work on the 37,000 books with binding damage has been almost complete since 2020.

However, the entire restoration of the “ash books” is proving to be extremely complex. In the restoration workshop for fire-damaged documents, which is unique in Germany and was set up in Weimar-Legefeld in 2008 with the support of the Vodafone Foundation Germany, around 60,000 sheets are restored every year. This workshop was specially developed to deal with large-scale fire damage, as there were no standardized procedures for dealing with such damage on a large scale at the time of the fire in 2004.

In addition to physical restoration, digitization also plays an important role. With the support of the Volkswagen Foundation, numerous “ash books” were digitized to ensure long-term archiving. The Klassik-Stiftung Weimar also released the film “Saving the Weimar Ash Books”, which provides an insight into the demanding work of the restorers.

From the very beginning, the restoration of the “ash books” was characterized by close scientific cooperation. An international advisory board was set up and several research projects were launched to support and further develop the restoration. The model projects funded by the Coordination Office for the Preservation of Written Cultural Heritage (KEK) include “Through fire and water. Weimar cloth bindings restored” (2011) and the project “Conservation of historical silk bindings” (2016).

Another essential research project has been carried out in collaboration with the University of Natural Resources and Life Sciences, Vienna since 2018. It deals with the “Use of nano- or microfibrillated celluloses for the stabilization and restoration of historical paper”. This innovative process could play a decisive role in the long-term preservation of severely damaged cultural assets in the future.

The collaboration with the University of Applied Sciences and Arts (HAWK) led to the exhibition “Restoration after the fire – Saving the books of the Duchess Anna Amalia Library” in 2014. This exhibition and the accompanying book document the extraordinary restoration process and offer insights into the technical and cultural challenges.

The restoration work, which is to continue until the end of 2028, is secured by federal and state funding. A total of 12.8 million euros has already been invested in the restoration and reconstruction of the Anna Amalia Library. This significant sum illustrates the enormous cultural importance of the project and the urgency of preserving Weimar’s literary heritage.

An important aspect of the restoration was also the improvement of fire protection. After the fire in 2004, a modern system was installed that can detect and fight fires in their early stages. This should prevent future disasters and protect the library’s valuable cultural assets in the long term.

Since its beginnings in 1547, the Duchess Anna Amalia Library in Weimar has been an important research and archive library focusing on the literary and cultural history of Europe, in particular on the period between 1750 and 1850. It continues the tradition of historical princely libraries and preserves a broad collection of works ranging from the 9th to the 21st century.

Further links

Ash books in the online catalog of the Duchess Anna Amalia Library

Ash books in the digital collections of the Duchess Anna Amalia Library

Database of fire losses

Details on the restoration of the recovered books and fire loss management

POTREBBE INTERESSARTI ANCHE

Unobstructed lake view

Building design

The balustrades of the terraces are also made of glass panels

On the Zürichberg, between rows of villas, stands an oddity: the House with a missing Column by Christian Kerez made of steel and glass.

The villas are lined up high on the Zürichberg – mostly hidden behind high hedges. From here, you can look out over the rooftops of the city, the lake and – on a clear day – the mountains. But there is an oddity in between: instead of plaster and scrollwork, it features steel beams, large windows and concrete ceilings. It is the so-called “House with a missing Column” by Christian Kerez.


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The construction consists of three pairs of gallows-shaped bar structures, which are positioned on the three sides that do not face the lake.

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The fine frames of the glass surfaces do not block the view of the lake.

Previously, an old building with a view of the lake stood here, which did not fill the maximum permitted building mass. The owners therefore decided to demolish the building in favor of a new building that would house three apartments. In their search for a suitable architect, they came across Christian Kerez by chance. On a walk through Zürichberg, they passed a house that Kerez had built for his mother – the apartment building in Forsterstrasse. Impressed by the raw power of the building, they knew that this architect of a monolithic-looking concrete structure should also build their home.

However, Kerez chose other dominant materials for this building: steel and glass. He wanted to open up the view of Lake Zurich and extend the interior to the outside. This is made possible on the one hand by the floor-to-ceiling windows with their fine frames, and on the other by the column-free rooms. The result is an unobstructed view of the lake. Sliding glass doors that run between the steel beams face the terraces. The balustrades of the terraces are also made of glass panels so as not to obstruct the view.

Missing support


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There are sliding glass doors facing the terraces that run between the steel girders.

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The balustrades of the terraces are also made of glass panels so as not to get in the way of the view.

The construction of the building allows for column-free spaces. It consists of three pairs of gallows-shaped bar structures, which are positioned on the three sides that do not face the lake. There, the gallows supports enclose the uses that Kerez has placed on the outside: the elevator to the north, the building services shaft to the west and the staircase to the east, which only serves as an escape route. Each of the three gallows consists of a column that is three storeys high. A 12.50-metre-high cantilever is clamped onto each storey, which makes the column-free living areas possible.

There is no support on the lake side, which one would actually expect to find there. This is not only due to the view of the lake, but also to the building law, as the development plan stipulated that no pillars were allowed at this point on the property. In place of the missing support, tension rods stabilize the construction in the horizontal direction. Almost invisibly, they enable the floating cantilevers.

A large glass surface

The support of the gallows is clamped into a reinforced concrete base on the first floor. The horizontally prestressed reinforced concrete ceilings additionally reinforce the steel gallows. The steel girders alternate with the windows between them. This turns the entire façade into a single large expanse of glass, allowing views of the surrounding landscape and insights into the raw appearance of the building. Despite the solid construction, the building appears transparent and blends into its surroundings. In Kerez’s words, the building has “a Californian charm with Swiss insulation specifications”. In order to create this subtropical atmosphere despite Central European temperatures, insulating blocks made of glass fiber reinforced plastic thermally separate the steel construction in the façade area.

All pictures by Georg Aerni

Alto Zürrus, a cloud of fog over the Turbinenplatz

Building design
Fog cloud Green City of Zurich, Turbinenplatz, photographer Tabea Vogel

Fog cloud Green City of Zurich, Turbinenplatz, photographer Tabea Vogel

A cloud of fog is supposed to cool the urban space above Turbinenplatz in Zurich. The first impression: it does little. “Alto Zürrus” is an immediate measure, read here how the square is to be cooled in the medium term and how the pilot project works and is received.

A cloud called “Alto Zürrus”

Zurich’s Turbinenplatz in the west of the city is regularly up to 6 degrees hotter than the surrounding area. To regulate the effect of the urban heat island, the city has now launched a pilot project: An artificial cloud of fog behind the Schiffbau building switches on at 30 degrees and is intended to have a cooling effect. Up to 10 degrees less should be possible thanks to the evaporating water particles, which extract heat from the surrounding air.

Anyone standing directly below or in the direction of the wind next to this artificial cloud will feel a slight cooling effect. Cooling water sprays from 180 nozzles over the heads of passers-by. To achieve this, the sensors of the ring-shaped installation must detect an air temperature of at least 30 degrees. There are also humidity sensors. If these detect impending rainfall, the cloud called “Alto Zürrus” does not become active.

The artificially generated fog cloud comes from an aluminum ring with fog nozzles that hangs from four wooden poles about five meters above the turbine site. The water is atomized so finely that the air around the cloud cools down. This should allow people in the vicinity to enjoy the cooler air without getting wet. It is expected that “Alto Zürrus” will operate on up to 44 dry, hot days per year.

Criticism of the cloud

Zurich’s new cloud has already attracted many interested parties. However, it quickly became apparent that the hoped-for effect is only minimal. People standing directly under the aluminum ring report a slight cooling effect. However, this is barely noticeable in the surrounding area and in other corners of the Turbine Square. The cooling spray mist does not reach the ground and the ambient air does not have a noticeably lower temperature.

The water consumption of “Alto Zürrus” is also a point of criticism – especially in view of the droughts in Europe. This is because it consumes drinking water and energy. Up to 100,000 liters of drinking water are sprayed each year. This equates to 7.5 liters per minute with the energy consumption of a vacuum cleaner.

The pilot project started in July 2022 and is scheduled to run until fall 2024. It is part of the specialist planning for heat reduction. The aim is to cool down the city in hot summer months. The funding comes from a Smart City innovation loan.

An employee of Grün Stadt Zürich came up with the idea for “Alto Zürrus”. He came out on top in an internal city competition. According to Grün Stadt Zürich, the project costs CHF 140,000. This also includes the costs for the scientific monitoring of the effect. This is because the effect is to be precisely measured and documented.

Comparison with “Le Nuage” in Yverdon 2002

Observers such as the Neue Züricher Zeitung (NZZ) compared the artificial cloud on Turbinenplatz with “Le Nuage”. This walk-in cloud at Expo 2002 in Yverdon was significantly larger. It is a steel construction in Lake Neuchâtel with a height of 20 meters and 31,400 stainless steel nozzles.

The NZZ wrote at the time: “Anyone strolling through the earth mounds of the Arteplage in Yverdon-les-Bains is reminded of prehistoric tumuli and dolmens. If you approach the lake from this direction in wet weather, you can see a small island rising out of the mist in front of you. From this perspective, the cloud looks like the mystical Avalon. Two fiberglass footbridges lead into it.”

In the “Alto Zürrus” cloud, it is not possible to walk through a cloud like in the mystical Avalon. However, the pilot project on Turbinenplatz is not art, but a means to an end.

The urban heat island Turbinenplatz

The city of Zurich planted additional trees on Turbinenplatz in the Escher-Wyss-Areal back in 2021. This is one of the largest squares in the city. As it is mainly covered in concrete, it gets oppressively hot here in midsummer. However, these trees need time to grow. The site conditions at Turbinenplatz are also not ideal: the trees will not be able to spread significantly or develop a large crown. At the same time, trees are the most effective means of combating the heat due to their cooling effect through evaporation and shade.

According to Zurich city councillor and head of civil engineering Simone Brander, we must assume that cities will become increasingly overheated as a result of climate change. The number of hot days could double to 44 per year by 2040. According to Brander, cities like Zurich have the potential to support heat reduction at a local level. According to the city councillor, the cloud is an immediate measure, while trees and surface sealing have a medium-term effect. Overall, a combination of different measures is needed.

Other cities, such as Vienna, are also experimenting with heat reduction measures in the form of artificial clouds. The effectiveness of “Alto Zürrus” will become clear from 2024 when the data is evaluated.

Read more about the city heat hotspot and measures for climate-conscious urban planning here.