Calchèra San Giorgio awarded for the organic base plaster Calcedicampo

Building design
Excellent! At Klimahouse 2023 at the Bolzano trade fair, the organic base plaster product Calcedicampo from the Trentino family business Calchèra San Giorgio won an award in the circular economy category. Photo: Calchèra San Giorgio

Excellent! At Klimahouse 2023 at the Bolzano trade fair, the organic base plaster product Calcedicampo from the Trentino family business Calchèra San Giorgio won an award in the circular economy category. Photo: Calchèra San Giorgio

Last Friday, on March 10, 2023, the base plaster product Calcedicampo from the Trentino family business Calchèra San Giorgio was awarded a prize in the circular economy category at the Klimahouse 2023 at the Bolzano trade fair

Last Friday, on March 10, 2023, the Calcedicampo base plaster product from the Trentino family business Calchèra San Giorgio was awarded a prize in the circular economy category at Klimahouse 2023 at the Bolzano trade fair

The Trentino family business Calchèra San Giorgio analyzes and produces specific materials for the restoration, structural consolidation and renovation of listed buildings. The materials are produced on a project-specific basis, according to requirements and needs, taking into account the historical construction methods, the original, locally used raw materials and the structural and aesthetic characteristics (cf. e.g. article on the Reinsberg residence, in: RESTAURO 3/2021, cover and p. 14 ff.).

Award for the Calcedicampo basic plaster product at Klimahouse 2023 in Bolzano

Last Friday, on March 10, 2023, the company’s base coat product Calcedicampo was awarded a prize in the category of circular economy, protection of the environment and human health at Klimahouse 2023 at the Bolzano trade fair. With its products, Calchèra San Giorgio always endeavors to meet the requests of monument authorities and designers. The raw materials used are natural and pure, selected according to time-honored traditions from classical literature and the craftsmanship of past centuries. All products are subject to strict production control, are CE certified and comply with European quality standards. By analyzing and studying ancient mortars, plasters and their formulas to produce specific materials for the restoration, reconstruction, consolidation of listed buildings and for sustainable, organic construction. Calchèra San Giorgio also provides trained specialists for analysis in the field of restoration. The studies are followed by detailed technical reports on the condition, damage and composition of the materials.

Calcedicampo base plaster is highly breathable, open to diffusion, very porous and hygroscopic, has thermal insulation properties, is mold-resistant and environmentally friendly. It is a product made from pure, recycled raw materials from the agricultural, food and brick industries. It is composed of pure, natural lime and granules from eggshells, amorphous ash from rice husks and cocciopesto – grit and flour in continuous grading and from bricks fired at low temperatures. The mortar is free of substances that are harmful to health and the environment. Calcedicampo base plaster is used to regulate and optimize the thermal and hygrometric situation in rooms. Condensation and mold form due to vapor-tight insulation materials on the outside, low diffusion capacity of the walls and/or thermal bridges. Thanks to its special composition and the resulting properties, Calcedicampo organic base plaster ensures a healthy indoor climate. It is ideal for sustainable, ecological, organic construction and renovation. Thanks to its excellent MBV value, Calcedicampo is a good substitute for clay plaster. This characteristic was tested and confirmed by measuring the Moisture Buffering Value Ideal (this parameter determines the amount of water vapor that is absorbed and released over a certain period of time in the event of fluctuations in relative humidity). The basecoat plaster also has high compressive strength and durability. The base coat is environmentally friendly, reduces CO2 emissions and reduces the consumption of raw materials. It is ideal for indoor and outdoor areas, on old and new masonry made of stone, brick, mixed masonry, concrete, aerated concrete, hemp bricks, rushes (reed mats), bamboo and straw. The plaster mortar has excellent compatibility with antique and historical materials and is therefore also recommended for the restoration of listed buildings. In the case of concrete and aerated concrete, the air, material and substrate temperature must be between +5°C and +35°C during application and the setting process. Concrete and aerated concrete must be primed in advance with Silifix – Calchèra San Giorgio to bind the water-soluble salts contained in these building materials and prevent these salts from blooming in the plaster. After a drying time of twelve hours, Fortis Vorspritz – Calchèra San Giorgio serves as a bonding bridge.

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Alongside other important works by Rembrandt (1606-1669), the Berlin Gemäldegalerie owns his masterpiece “Susanna and the Two Old Men” (1647). Recent studies of the painting have produced spectacular new findings. We spoke about the discoveries with Katja Kleinert, research assistant, and Claudia Laurenze-Landsberg, conservator at the Gemäldegalerie der Staatlichen Museen zu Berlin (SMB). The latest results of their […]

Alongside other important works by Rembrandt (1606-1669), the Berlin Gemäldegalerie owns his masterpiece “Susanna and the Two Old Men” (1647). Recent studies of the painting have produced spectacular new findings. We spoke about the discoveries with Katja Kleinert, research assistant, and Claudia Laurenze-Landsberg, conservator at the Gemäldegalerie der Staatlichen Museen zu Berlin (SMB).

From March 3 to May 31, 2015, the Berlin Gemäldegalerie and the Kupferstichkabinett (SMB) are presenting the latest results of their examination of the Dutch artist Rembrandt Harmensz. van Rijn in the exhibition “Rembrandt’s Berlin Susanna and the Two Old Men. The creation of a masterpiece”. What exactly did you find out?

Kleinert: Rembrandt worked on the Berlin “Susanna” for more than a decade and created three different versions of the depiction during this time. This was already known and documented by the Rembrandt Research Project. Now, however, it is possible to reconstruct the three versions in detail. In addition, in collaboration with the Kupferstichkabinett, it has now been possible to reassess the time when work on the painting began. The first composition must have been created around 1635 rather than 1638. What was previously completely unknown and truly spectacular is the discovery that the work was extensively reworked again in the 18th century.

How did you track down this sensation?

Kleinert : The decisive clue came from a reproduction engraving by Richard Earlom (1743-1822) from 1769. The original is kept in the Kupferstichkabinett (SMB). The sheet documents the version of the picture that Rembrandt left to posterity in the 17th century. A comparison with the present-day work reveals how much more differentiated the painterly execution of the painting must originally have been. As a result, it was possible to correlate existing art technological results, which proved that parts of the painting had clearly been reworked at a later date.

Laurenze-Landsberg: ” Earlom’s reproduction engraving was a relief for me. I had already examined the panel painting with a stereomicroscope before I became aware of it. The separation of the paint layers and chipped areas revealed beautiful, precisely executed details that had been very roughly painted over. At the time, however, I still assumed that Rembrandt had reworked the painting and was confused by the master’s superficial, less meticulous way of working.

What investigations did you then carry out to investigate the suspicion of a later intervention by a third party?

Laurenze-Landsberg: In addition to the neutron autoradiographs, we also analyzed the X-ray, infrared and grazing light images and examined the image stereoscopically. The image carrier is a sugar box wood which, contrary to previous assumptions, is not made of mahogany but amaranth. The sugar trade flourished in Amsterdam in the 17th century.

You assume that the later overpaintings are by the English painter Sir Joshua Reynolds (1723-1792). What supports this theory?

Kleinert : The provenance of Rembrandt’s Berlin “Susanna” is very well documented. Two painters had the panel in their possession. Sir Joshua Reynolds was one of them. He owned the painting for a particularly long time. We also know that Reynolds was interested in old painting techniques. And that he often worked on other people’s works and altered or corrected them to suit his own taste. He was also not afraid to remove paint in order to study the working methods and techniques of other artists. By looking at the original together with English colleagues from the Reynolds Research Project, the painting technique could then be clearly attributed to Reynolds.

Laurenze-Landsberg: The neutron autoradiography supports this thesis. It shows intense blackening caused by the antimony isotope SB-124. Since no tin can be detected at the same time, the antimony-containing pigment must be Naples yellow. It came into increasing use from the middle of the 18th century. Elsewhere, the paint layer is swollen, which indicates the use of copaiva balsam. This is a resin that was used to “freshen up” paintings. It is known that Reynolds used it as a binding agent.

How do you assess the reworkings today?

Kleinert: There are examples of even more far-reaching interventions that raise the question of the extent to which one can still speak of an original masterpiece. The Berlin “Susanna and the Two Old Men” is a painting that has been altered at a later date and must be declared accordingly. But it remains a Rembrandt.

The interview was conducted by Britta Grigull.

More on Rembrandt’s drawings, the biblical Susanna theme and the corresponding Berlin exhibition in RESTAURO 2/2015.

Architects in snow fever

Building design

At the beginning of February 2015, the tenth open German Architects’ Championships in the disciplines of skiing and snowboarding took place in Mellau and Damüls, Austria. Around 120 participants took up the challenge. around 120 participants took up the sporting challenge.

At the beginning of February 2015, the tenth open German Architects’ Championships in the disciplines of skiing and snowboarding took place in Mellau and Damüls, Austria. Around 120 participants took up the challenge. around 120 participants took up the sporting challenge. At the warm-up in Peter Zumthor’s “Werkraum” in Andelsbuch on Thursday evening, the early arrivals were able to get a first impression. In the exhibition “No Name Design” by Franco Clivio, the focus was on the inconspicuous things that accompany us in everyday life and yet rarely attract attention.

The following evening, the GAM open 2015 was officially opened by patron Lutz Heese (President of the Bavarian Chamber of Architects) in the Elsenalpstube in Damüls. After the subsequent ‘Kässspätzle’ meal, which was a culinary highlight, originally served in a wooden bowl, the 4 kilometer long and illuminated toboggan run into the valley could be tested. In bright sunshine and perfect conditions with 1.90 meters of snow, the starting signal for the 10th GAM open in the parallel slalom discipline for skiers and snowboarders was given on Saturday morning.

Jannis Merz (men’s skiing) with 22.420s, Armin Tittel (men’s snowboarding) with 27.360s, Birgit Keppler (women’s skiing) with 26.430s and Ulrike Schneider (women’s snowboarding) with 34.780s won the championships with best times. The office championship went to the team from the Reutlingen Chamber of Architects (Nightmare 2). The award ceremony took place in the evening, followed by a party at the four-star Design Hotel Sonne in Mellau.