Waterstruck bricks: For future generations

Building design
Roland Classen, Marketing Manager at Vandersanden

Roland Classen, Marketing Manager at Vandersanden

Belgian brick specialist Vandersanden has developed a range of water-struck bricks for the first time. The special feature: the new product has the same material properties as a clinker brick. We had Marketing Manager Roland Classen explain the innovation to us.

Belgian brick specialist Vandersanden has developed a range of water-struck bricks for the first time. The special feature: the new product has the same material properties as a clinker brick. We asked Marketing Manager Roland Classen to explain the innovation.

“We radically questioned everything in the new development of our waterstruck bricks – both the clay mixtures and the firing processes. Basically, we started almost from scratch,” explains Roland Classen, Marketing Manager of the long-established Belgian brick producer Vandersanden. On the other hand, the development time for the new product of just under a year does not seem excessively long. Especially in view of the result: the new waterstruck brick from Vandersanden has material properties that otherwise only standardized clinker bricks have. The water absorption of the bricks was limited to a maximum of six percent. For some colors, it is even just under four percent. This makes the new product considerably more robust than conventional waterstruck bricks.

The incentive for the product development was a special feature of the German market, explains Roland Classen: “Unlike the two German plants, Vandersanden mainly produces bricks by hand in its brickworks in Belgium and the Netherlands. This production method has a long tradition in the Benelux countries. Hand-molded bricks are used there for practically all building typologies.” Not so in Germany. In this country, hand-molded bricks are used almost exclusively in single-family house construction. Large projects are dominated by extruded bricks instead, which are practically indestructible thanks to the sintering process. While the aesthetics of the filigree lines on the surfaces of the bricks may also lend a façade a unique effect, architects and clients in commercial construction relied primarily on the proven material properties of extruded clinker bricks. Now, however, nothing stands in the way of the unrestricted use of waterstruck bricks for extravagant façade design.

However, it is precisely these properties of the hand-formed and water-struck brick that have now found many friends again. In particular, the water-struck brick, as we know it from Scandinavia, is booming. It has a characteristic irregular surface, which is created by using water as a release agent. The filigree lines created by the water produce a subtle play of light and shadow on the wall surface. The – intentional – air pockets also leave their mark on the surface of the brick, making each brick unique.

“We have received a lot of customer requests for waterstruck grading,” reports Roland Classen: “That was the reason for us to include such a product in our range. But it needed to have properties that would also make it attractive for large projects. We wanted to create an alternative to extruded clinker.” The fact that Vandersanden has tailored its new development specifically to the needs of the German market is also evident from the fact that the new solid brick can initially only be ordered in German standard format and BDF.

Vandersanden decided to get down to business and launch an entire range on the market. It comprises five basic colors and a total of 26 variants. Two more basic colors will be available from autumn. Vandersanden also put a lot of effort into the development process for the different colors and assortments: “We organized test panels with over 70 different product samples. At the end of an extensive evaluation process, we arrived at the color palette that is now available,” explains Roland Classen. Incidentally, the number of variants differs depending on the base color. For example, there are seven yellow ranges but only three based on the base color black. “You can play with some colors more than others,” says Roland Classen.

To show the leap in development that Vandersanden has made with this new product, the color variants have been named after great researchers and discoverers. Thomas Edison, Gregor Mendel, Heinrich Hertz and Ferdinand Magellan, among others, are the inspiration for the different grades. How exactly the new high-strength waterstruck bricks are manufactured is, of course, a trade secret. “We have made significant changes to both the recipe itself and the firing process,” reveals Roland Classen.

Research plays an important role in Vandersanden’s corporate strategy anyway. The company has been working with various universities for many years. The Belgian University of Leuven, for example, is a long-standing cooperation partner. The exchange with educational institutions is not a one-way street: “We are also interested in bringing specialist knowledge to the universities,” reports Roland Classen.

Sustainability now plays a key role in the company’s development activities. Several approaches are being pursued, as Classen reports: “In Germany, for example, we are trying to establish brick slips and smaller formats as alternatives to the standard formats,” says Roland Classen. Bricks with a width of 75 millimetres, for example, are still a niche product. However, the material savings are significant and, ultimately, bricks are only used constructively in exceptional cases and not as facing bricks.

But Vandersanden is also making enormous efforts in terms of production technology to reduce itsCO2 footprint. Vandersanden also offers hand-molded and water-struck ECO brick slips, which are produced as direct brick slips instead of being sawn from solid facing bricks. A process specially developed by Vandersanden: resource-saving and with 70 percent lessCO2 emissions.

To generate electricity, Vandersanden installed a wind turbine with a capacity of 10,000 megawatt hours next to the plant in May 2022. In terms of energy capacity, this is around twice the consumption of the brickworks in Lanklaar, Belgium. But Vandersanden is pursuing even more ambitious goals. The developers are currently working on a new product that could be a game changer in the ceramic façade sector. Vandersanden will reveal more details later this year.

“Together to Zero” is the promise that Vandersanden makes to its customers. Together with them, the company wants to reduce its ownCO2 emissions to zero in the coming years. “We are no longer investing in conventional manufacturing processes, but only in sustainable technologies,” summarizes Roland Classen. “The family business can only afford to do this because Vandersanden has geared its corporate strategy to extremely long periods of time,” says Classen. “At Vandersanden, investments are not made in years, but in generations.”

More about waterstruck bricks at vandersanden.com

All photos: Vandersanden

POTREBBE INTERESSARTI ANCHE

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.

Photos: eSel.at / Lorenz Seidler

Clothe, undress

Building design

Photo: Reimer Verlag

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 […]


„Buch-Gewänder“ von David Ganz
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.


Elfenbeintafeln
Ivory panels, photo: Reimer Verlag


Elfenbeintafeln
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.”


Buchkasten
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.”


Buchkasten
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