House to the lime garden, Zürich

The project
The Haus zum Lindengarten is a main component of a stately complex located in the immediate vicinity of the Kunsthaus. The building was renovated with the least possible intervention in the existing fabric. Since all the pipes in the building were replaced, new openings were required in the floor ceilings. These had to be statically calculated and correctly executed in terms of fire protection. The two-story roof had special requirements because its existing construction did not comply with fire protection regulations. After the repair, the two attics of the main building can be converted into office space.

The construction
The smaller buildings behind the main building used to be a stable and barn and were built in frame construction. The main building consists of a rubble stone masonry. The storey ceilings are made of wood with beams placed end to end. The two-story roof is a horizontal truss in construction and spans from exterior wall to exterior wall. Without a support, the attic offers itself as a spacious meeting room.

The challenge
All existing old constructions had to comply with the new fire protection regulations. These had to be incorporated and verified. The attic could be reduced in fire resistance by a fire protection concept with good justification. Thus, the beautiful existing old lying roof truss could be strengthened with a few targeted measures to comply with the guidelines.