1960s to 2010s In 1965−1967 the
nave was restored, and the original west facade of the church building largely rebuilt and renovated. At that time the first studies of retaining the Gothic era abbey−choir building for the
Zentralbibliothek Zürich (literally Zürich Central Library) or reuniting it with the former nave were done. In 1989 a fierce public debate rose on those options, culminating in a cantonal−wide referendum. The proponents for retaining it for civic use won the ballot referendum. In the 1990−1996 remodeling of the library, the choir was retained as part of the library, and houses its
Musikabteilung (music collections department). In 1974 the facade of the choir building was restored, and the shingles of the roof rider renewed. The leak and weathered roofing was replaced on the basis of existing records in the pointed knob with handmade impregnated roofing shingles. The hue of the top coat was held in an oxide-red tone. The bearing of the weather cock was made accessible, and the pommel balls over the gables and the tower were re-plated in gold. On occasion of the state examination in 2008, there were various defects found in the roof work. The bell almost touched one side of the roof turret-bell tower, although this was to have been addressed in 2006 renovations. To avoid damage to the historic building, the weakened structural parts were restored, strengthened, and when necessary replaced. The hexagonal roof turret's pointed helmet had to be stabilized, and many components were in poor condition, the shingles were very brittle, there were cracked sheet metal seams, and the copper plate did not keep even slight pressure. The main reinforcements and restoration work in the choir building were completed in 2010.
2012 restoration In 2012 the choir building's owners, including
Reformierte Kirchgemeinde Predigern (church congregation) and
Zentralbibliothek (central library), and the city of Zürich's departments of
Praktische Denkmalpflege' and
Archäologie des Amts für Städtebau, commissioned the Gugler construction company to repair the roof's skylights during the summer season. The restoration work was designed and specified to last for a minimum of 50 years, to avoid any more repetitions of extensive structural work for decades. The renovations, repairs, and additions to the historic roof structure proceeded cautiously and with due diligence research, although both records of the supporting structure and documentation of previous restorations was lacking. In collaboration with the city of Zürich, a high scaffolding tower was erected. The southwest side hip rafters of fir wood roof of the plant had moisture damage due to leaking roof shingles. It was plated with two dry, one year stored spruce wood parts, that were cope planed, glued together and the cross-sectional dimensions of wood connected with wooden screws. In addition to the general repairs to the structural stabilization of the first stator, the fixing of the rafter positions took was effected. Collar beam and strut pairs were cut off or removed in the roof structure. The respective opposite tower stands of the bell tower were stabilized with a total of three tie rods, and no longer repairable oak timbers were replaced. The iron forged bolt lugs and nails ware extensively restored and reused. The wooden surfaces of the tower threshold ring, the moisture damage and the weakened old anchoring system of hexagonal roof turret-pointed helmet, required extensive reinforcements and repair measures, so that the existing bell bearings could be obtained. The new roof shingles of the bell tower consist of radially to the root-derived spruce wood, which has been pressure treated prior to assembly. The shingles were placed on the hexagonal spire and the tower shaft offset strengthened with thin lead plates, so-called
nouques. The shingles were painted with the color
Caput Mortuum V (Violet), based on the color analysis on the roof turret itself, on research in the city archives and based on color of the tower of the church and the sandstone used in the choir. The crowning feature (knobs) and the lip contours, eyes and teeth of the
Gargoyles were covered with gold leaf. The costs amounted to 1.1 million Swiss Francs. == Pipe organ ==