Extensive green roofs are easy to establish on roofs with a pitch of up to 35°, provided their special features are taken into account.
Extensive green roofs can be established well on roofs with a pitch of up to 35°, provided that their special features are taken into account: higher shear forces, faster water run-off and different sun exposure in north-south locations.
In addition to the appropriate system structure with the corresponding drainage element, the right choice of substrate and plants, such as pre-cultivated vegetation mats, erosion protection fabric and additional irrigation, the focus is on the shear forces that occur. These vary depending on the roof pitch, roof size, weight of the green roof structure and an assumed additional snow load. In order to ultimately transfer these forces into the roof substructure, a stable roof eaves and possibly additional shear sills in the area are necessary.
ZinCo has developed a permanently safe and elegant solution for this with the new stainless steel Schubfix LF 600 shear bracket. It has a load capacity of 600 kg and is used in conjunction with the stainless steel TRP profiles on the eaves or in the surface.
Schubfix LF 600 consists of a base plate (140 mm x 90 mm) plus holder (140 mm x 60 mm, height 100 mm), which must be sealed in accordance with the loose / fixed flange principle based on DIN 18195-5. The base plate is mounted as a fixed flange on a solid, sealed substructure, whether made of solid wood or concrete, and professionally sealed all around. A protective layer made of EPDM is placed over the two threaded bolts of the base plate so that the actual holder seals itself as a loose flange via the contact pressure.
This solution replaces the usual shear sills made of wooden planks, which are much more labor-intensive to seal. What’s more, timber can lead to material distortion and thus weak points in terms of tightness.
The TRP stainless steel profiles (height approx. 80 or 140 mm depending on requirements) are attached to Schubfix LF 600. Their slotted perforations always allow water to drain away unhindered. This eliminates the need for interruptions and slopes as with wooden planks and water pockets are also not an issue. ZinCo thus offers a technically perfect detailed solution that also offers visual benefits – with a “slim” roof edge.
Hall A3, Stand 119
Contact: Managing Director Manfred Krüger
Par force ride through the history of construction
Building design
Peter Märkli and Jacques Herzog
Dietmar STEIN bids farewell to the AzW with the 20th Vienna Architecture Congress.
Dietmar STEIN has been an observer and player in the international architectural discourse for around four decades. He founded the Architekturzentrum Wien in 1993 and is now ending his work there. Not only for reasons of age, but also because he has become pessimistic, as he says: “…I must confess that I am no longer interested in contemporary business architecture. In recent years, universities have produced too many architects who only want to be successful on the market as service providers…”
He has organized 19 architecture congresses and bid farewell last weekend with the 20th edition. But not on just any topic, no, he reviewed every single decade since 1960: Over two days, there was a lecture on each decade followed by a discussion. Protagonists from that time were invited to the podium, a long illustrious list that attracted many listeners: Rob Krier, Jacques Herzog, Dominique Perrault, Hermann Czech, Wiel Arets, Nathalie de Vries, Roger Diener, STEIN Holl, Bart Lootsma, Peter Märkli, Wolf Prix, Bruno Reichlin and many more – Dietmar Steiner’s companions from his “architectural socialization”, as it was called.
A good concept: the older gentlemen report, the younger generation provides the moderators and the questions. But as is often the case with such a wealth of contributions, the audience soon got the feeling that the architectural celebrities, who had traveled a long way to be there, did not get to speak enough, were not allowed to talk at length about what it was like back then and, above all, how they see their own history today, because there was far too little time. Especially as the debates, with the exception of one discussion, were held in English: So there was a danger with a lack of knowledge of the language – which no one can be blamed for – that the statements were greatly simplified, even trivialized. There was hardly any conversation on the podium, with one short statement following another and no questions from the audience.
But of course there were many remarkable moments in this architectural history marathon: For example, when Jacques Herzog said about his teacher Aldo Rossi – in German, by the way, in his strong language – that he admired him as a student, but was disillusioned when he visited the Gallarartese residential row in Milan again and found only a “built drawing”. Or when Wilfried Wang surprisingly spread the hope in the much-vaunted times of crisis that creativity today comes from the more innovative third world and that architects there are in the process of finding solutions to the problems of our time. Or when Wolf Prix stated that today everyone is “afraid of the future, whereas in the sixties people believed in the future”. Or when Rob Krier sternly admonished architects to develop their own “signature style without offending the cities”.
There was also a successful introduction to the congress by Jean-Louis Cohen, who sensitively brought the post-war period back to life for the audience and prepared them for the decades to come. As well as a particularly successful conclusion with Juhani Pallasmaa: the great, old, wise Finnish gentleman of architectural history advised in a profound essay for less excitement, more prudence and modesty: no fear of repetition, “let’s repeat ourselves”.
What remains? There will be an issue of the magazine Arch+ on the congress in the middle of next year, and you can visit an exhibition worth seeing at the AzW until March 20, 2017: Curators Karoline Mayer, Sonja Pisarek and Katharina Ritter have not let Steiner’s pessimism get to them and have put together an optimistic show with interesting buildings as cornerstones of the decades. They were able to translate Dietmar STEIN’s attitude that architecture is at an end into the title “At the End: Architecture. Time travel 1959 – 2019”.
Incidentally, Angelika Fitz will take over the management of the AzW in the new year and we will introduce her in more detail in our February issue.
David Ganz has written an extremely knowledgeable history of medieval book bindings. Whether the book exists as an object of artistic design or is drowning in the euphoria of digital marketing ideas – David Ganz cannot answer this question. However, there is no doubt that there are wonderful book bindings. Especially not for David Ganz, Professor of Art History of the […]
Book bindings by David Ganz
David Ganz has written an extremely knowledgeable history of medieval book bindings.
Whether the book exists as an object of artistic design or is drowning in the euphoria of digital marketing ideas – David Ganz cannot answer this question. However, there is no doubt that there are wonderful book bindings. Especially not for David Ganz, Professor of Medieval Art History at the University of Zurich and author of the recently published book “Buch-Gewänder – Prachteinbände im Mittelalter”. However, Ganz complains at the beginning of his richly illustrated, highly complex and fascinating study, which delves deep into medieval religious thought, that the “weight of holy books as aesthetically designed sacramentals is dramatically underexposed in more recent accounts”. Ganz’s book stands against this trend, which, like any good pictorial description, not only opens the reader’s eyes to details, but also places its subject in its time. It is clear that details of splendid bindings of the Gospels and liturgical texts require a great deal of basic knowledge, but this is not a prerequisite for the author. And that is a very good thing, because there is much to explain about medieval thought.
These explanations are often highly theoretical, but extremely exciting. For example, when Ganz explains the depictions of the Genoels-Elderen book cover from the Musées Royaux d’Art et d’Histoire in Brussels: “The motif of Mary with spindle and skirt was frequently found in late antique Byzantine pictorial art, but rather rare in Western art. These paintings are based on the stories of the apocryphal Protoevangelium Jacobi, according to which Mary was stretching purple for the temple curtain at the moment of the Annunciation. In the early Middle Ages, the motif of Mary’s handiwork in book covers appears again, albeit in a much more symbolic form: “The Christian interpretation of the veil, which Paul develops in the Letter to the Hebrews, speaks of the veil of the flesh and thus refers to the incarnate Christ himself. The Jewish curtain in front of the Holy of Holies is reinterpreted here as the garment into which Christ slips at the incarnation. Mary’s role as the Mother of God, as can often be read in the literature of the Church Fathers, was that of a robe-giver.” This depiction in turn serves to adorn a garment– the book garment, which is made of ivory. The precious white ivory was regarded as a symbol of Mary’s virginity, from whose flesh Christ was born. The artistically perforated surface of the picture “imprints the flesh-like material with its own enveloping quality”, writes Ganz.
Ivory panels, photo: Reimer Verlag
Ivory panels, photo: Reimer Verlag
The web of meaning that is uncovered here corresponds with the artistic design of the book covers, which were often boxes that housed the Gospels. This is why Ganz, using the example of the wonderful Uta Codex of 1020/30 from a Regensburg goldsmith’s workshop, speaks of vestments on two levels “On the first level, the binding is a decorative ornament of the Gospel book made of precious materials. This is the exterior-interior relationship constitutive of our genre. On a second level, the binding is the carrier for an image that represents the body of Christ. In this image, Christ himself is already wrapped in a robe. The wearer of the robe, who has taken his place in such full form on a throne, is a figurative image body that is only made available by the book cover itself. “But that is not all: when a book is taken out of the book case for reading, it is undressed and made to sound through the reading. When the book was put back into the box after the reading, “the codex filled with characters was reunited with its pictorial cover, which indicated the presence of Christ in the Gospel book for the entire remaining part of the Mass.”
Uta codex from 1020/30, book box, photo: Reimer Verlag
Such an explanation is nothing short of breathtaking. Explanations of the book held in the hand of a Christ depicted on a book case lead even deeper into medieval thinking: “The figure of the ruler of heaven represents a person constituted by the book, in this book.”
Uta codex from 1020/30, book case, photo: Reimer Verlag
These examples, which are only excerpted here, already show the huge wealth of knowledge that David Ganz spreads out. And which is not only of immense value in terms of religious history, history and art history, but must be the basis of any study of medieval book bindings.
David Ganz “Buch-Gewänder -Prachteinbände im Mittelalter”, Reimer Verlag, 368 p., 79 Euro