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Addition to an Old Townhouse in Linz by Mia2
This article details the renovation and expansion of a dilapidated 16th-century townhouse on Lederergasse in Linz by Mia2 architects Sandra Gnigler and Gunar Wilhelm. Originally slated for demolition, the architects acquired the building to serve as a pilot project for a resource-saving renovation, largely carried out with their own labor, and to house their architectural studio. The project involved multiple building phases, adding two-and-a-half storeys using wood-building techniques, and ultimately creating 10 new apartments.
The initial phase of the renovation focused on addressing the damp masonry in the foundation. Heat pipes were used to dehumidify the area, and the existing floor slab was dismantled. A key aspect of the resource-saving approach was the reuse of materials; the earth beneath the removed floor slab provided clay for prefabricated rammed earth wall elements. These elements required two years of storage before they could be installed as the load-bearing wall of the new rooftree. The new floor slab was insulated with cellular glass to protect against soil moisture. Throughout the renovation, the architects also replaced the existing windows with thermally insulated box windows, designed with muntins to maintain the building’s historical aesthetic.
Renovation of the upper levels proceeded after the expiration of tenants' lease agreements. The undersides of the original wooden ceilings on these floors were preserved and upgraded through the incorporation of concrete-and-timber constructions, blending historical elements with modern structural integrity. A significant alteration to the building's exterior involved the removal of the existing saddle roof. It was replaced with a new two-and-a-half-storey addition, featuring a new saddle roof, large dormers, and a sheet metal covering. The old roof tiles were not discarded but found a new purpose as the roofing for a barn in the surrounding area, further exemplifying the project’s commitment to resource conservation.
To optimize the limited internal space of the existing walls, the architects designed and installed a facade-side spiral stairway made of bespoke prefabricated concrete components, replacing the original steep interior staircase. The newly created apartments, while compact, were enhanced with communicative balconies. These balconies, supported by a delicate-looking steel construction, face a planted inner courtyard, providing residents with outdoor living space. A notable feature of this densification project is the creation of attic-level maisonette units, which offer panoramic views over the Old Town of Linz. The project by Mia2 stands as an example of sustainable urban renewal, combining historical preservation with modern living and resource-efficient construction practices.
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