Preservation of Historic Buildings and Monuments

Luckhardt House
Am Rupenhorn 25, Residential Building,
1929-30 by Hans and Wassili Luckhardt and Alfons Anker, Garden, around 1930 by Berthold Körting

Preservation of the Historic Building Luckhardt House

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The heaviest encroachments were made in the outer shell of the building at Rupenhorn 25 and the corner of Heerstraße decades ago. The most serious instance of such interference with the original material was the very extensive removal of the outer shell and its replacement with a covering of wood wool boards. It could not be determined exactly when this was done. However, the material-related expansion factors must have quickly led to the extensive formation of hairline cracks in the exterior plaster of the extended edges of the wood wool slabs. In order to eliminate these physical and esthetic structural defects, a decision had been made in the 1970s to laminate the facade with a polyester cloth and to coat it with white dispersion paint. After twenty years, this system had worn through. Many different possibilities were considered when the renovation concept for the building at Am Rupenhorn 25 was being developed. A general concept was finally put together in coordination with the historic preservation authorities. Within this concept, the renovation work on the facade would take place with the most stringent care for the existing material. Before the renovation work began, the state of the existing plaster on the facade was inspected. On the building Am Rupenhorn 25 and the corner of Heerstraße, it was necessary to remove the polyester lamination that had worn through and was no longer holding fast. After the lamination was removed, the condition of the plaster was examined visually. The results of the inspection showed that an extensive network-like development of cracks existed in the areas of the wood wool slab joints. For the most part, the plaster was still solidly affixed to the support system. Using a mapping of the actual condition, the plaster areas to be removed were first marked on site and only then was their removal authorized. These repairs were carried out with a plaster type from the standardized mortar category P II a. The network-like cracks distributed across the entire facade were not filled in with this plaster type. Instead, a decision was made to cover them up with a fine, very thin polyester fleece. A silicone resin was used in doing this. Larger uneven areas were flattened out with a silicone resin spackle, and a silicone resin was also applied as the middle and covering layers. All exposed metal parts were treated with corrosion protection. The inspection of the paint on the metal railings found that the original paint was a medium gray, and so a new layer was applied in accordance with the findings.
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