In the conservation studio Walter Hammer, Ulm:

• Brenz an der Brenz, St. Gallus church, facade, 13th century (1965-1966)
• Ulm, Münster, west portal, interior, wooden and stone sculptures, plasterwork and wall painting on the triumphal arch 1471 (1964-1975)
• Ulm-Wiblingen, library, stucco, polished white and ceiling frescos by F.M.Kuen 1744; Collegiate church, stucco, stucco marble and ceiling frescoes by Januarius Zick 1778-81 (1962-1965)
• Heilbronn, St. Kalians church, main altar by Hans Syfer 1491 (1964-1968)
• Blaubeuren, Ephorate, carved wood paneling by Jörg Syrlin the Younger, E. 15th century (1966)
• Tübingen, town hall, east facade, sgraffito 1598/1872 and council chamber, wood paneling, late 16th century (1967-1968)
• Blaubeuren, collegiate church, main altar by Michel Erhart, 1493 (1969-1975)

Federal Heritage Office, 'Restaurierwerkstätten' (Department for Conservation-Restoration)

Mostly pilot work, often together with freelance conservators-restorers.

• Eitzing, St. Sebastian, polychrome wood sculpture, Thomas Schwanthaler, 1661 (1971-1972) (BDA W5296)
• Lambach, collegiate church, former "Läuthaus" (bell ringing room), wall painting around 1080, air condition, mineral consolidation and salt reduction, a pioneer work  (1976-1994)
• Vienna, Belvedere, Beethoven Frieze, wall painting on wooden support, monumental pastel, Gustav Klimt, 1902, conservation (1977-1984, )
• Melk, collegiate church, epiphany chapel, wall painting and stucco marble, Joh. M. Rottmayr, 1718, pilot work (1977)
• Bad Aussee, hospital church, wall painting h. Thomas, E. 14th Century, detachment, transfer on new support and restitution in situ (1977-1978)
• Vienna, Stephansplatz, underground Virgil chapel, around 1230, wall painting,  wall painting, mineral consolidation and salt reduction, restitution in situ of transferred conch (1978-1979)
• Volders, Friedberg Castle, hunting room, wall painting around 1520, salt reduction (1980)
• Salzburg, Benedictine convent Nonnberg, former paradise, wall painting around 1150, air conditioning, fixation, cleaning (1987-1996)
• Vienna, St. Stephen's Cathedral, former treasury, facade, Passion frescoes, around 1470, mineral consolidation, salt reduction (1979-1985) (1999-2000 reconversion of gypsum, diploma thesis by Jörg Riedel)
• Judendorf-Straßengel, Maria Strassengel pilgrimage church, plasterwork and tympanum reliefs, around 1350, mineral conservation of plasterwork and restoration, reliefs: reconversion of gypsum and mineral conservation, pioneering work (1980-1986)
• Nötsch-Saak, Saak parish church, south facade, wall paintings 1465 and 1516, removal of superimposing layers of whitewashes, consolidation, restoration (1982)
• Metnitz, Karner, Totentanz, 1968-1970 detached wall painting around 1500, second transfer to a honeycomb support (1985-1996)
• Grades, daughter church, south facade, plaster and wall painting, 15. century, pilot work together with craftsmen (1986)
• St. Lambrecht, collegiate church, tower facades, plasterwork and wall painting, mid 17th century, conservation and restoration in cooperation with craftsmen (1987)
• Parz Castle near Grieskirchen, south facade, wall painting around 1580, pilot work: cleaning, reconversion of gypsum, consolidation, aesthetic presentation (1987-1990)
• Weißenkirchen, parish church, facades, 1510; "Corner Tower", west facade, 14./15. century; Teisenhofer Hof, courtyard and southern facade, 1542. Conservation and restoration in cooperation with craftsmen (1989-1990)
• Krems, Ursula chapel, plastered and painted west facade, around 1300, 15th century,  conservation, including salt reduction  and restoration (1990)
• Pöggstall, castle, arcaded courtyard, wall painting, around 1540, cleaning, consolidation, aesthetic presentation (1990-1996)
• Hohensalzburg, horizontal tower, 16th century (1991)
• Fusch an der Großglocknerstrasse, parish church, tower facade, restoration of the 18th c. decoration, 13.-20. century (1991)
• Flaurling, Ris building, library 15th century, painted plastered facade, conservation and restoration (1991-1993)
• Forchtenstein, castle, inner courtyard, wall painting 1687, cleaning including reconversion of gypsum, salt reduction, aesthetic presentation (1991-1993)
• Leiben, castle, facades, 17th-19th century, painted facade, pilot work: restoration in cooperation with craftsmen (1994)
• Vienna, St. Stephen's Cathedral, Bartholomew's Chapel, 14th century, interior, concept of conservation and repair (1994)
• Bregenz, Martinsturm, interior, plaster and wall painting, mainly 14.th century, conservation-science study, concept of conservation (1996-1997)
• Hard, Mittelweiherburg, facade, 16th century, repair in the context of a train course for craftsmen (1996)

HAWK University of Applied Sciences and Arts,  Conservation-Restoration Course, specialization: wall painting/architectural surfaces

Central projects in Germany (Lower Saxony, Mecklenburg-West Pomerania, Saxony-Anhalt), Austria (Lower Austria, Carinthia), Czech Republic, United Kingdom, Poland, e.g. B.

• Hildesheim, St. Michaelis, cloister, stone surfaces, conservation-science study, conservation-restoration (together with Lothar Hoffmann and Marion Eifinger (married Friedrichsen) (1997-2000)
• Bokel/Lower Saxony, St. John's Chapel, facade, painted brick, conservation and repair (1997)
• Horn/Austria, Piarist monastery, training in plasterwork and sgraffito (1998)
• Königslutter, Imperial Cathedral, westwork, ceiling painting 15. Jh., conservation-science study, conservation probes (1998)
• Bad Gandersheim, collegiate church, west gallery, conservation-science study (1999)
• Schöningen, cloister, lime plaster1457, conservation-science study, conservation, repair  (1999-2000)
• Müsselmov, village church, interior, mural painting mid 18th. century; CSS, cleaning, conservation and restoration (2000-2008)
• Lüneburg, City Hall , interior rooms, wall painting and historic flooring, 14th/16th century; conservation-science study, concept for conservation and repair, pilot works (2001-2004)
• Idensen, Sigwards Church, interior, wall painting around 1130; conservation-science study, salt reduction, reconversion of gypsum, maintenance concept (2001-2005)
• Brno/Czech Republic, House Tugendhat, architects: Ludwig Mies van der Rohe and Lilly Reich, 1930, facade and interior:  conservation-science study, concept for conservation and repair, pilot works (2003-2010)
• Braunlage, Sanatorium Dr. Brown, facade and interior, 1912-1914; conservation-science study, concept fort conservation and restoration (2004)
• Brno/Czech Republic, exhibition center, pavilions by Emil Králík, Pavel Janák, Josef Gočár 1928; conservation-science study, concept fort conservation and restoration (2005-2006)
• Inglesham/Wiltshire/United Kingdom, St. John the Baptist, facade, interior, mainly 13th and 16th century; conservation-science study, concept fort conservation and restoration (2005-2007)
• Mittelwalde/Międzylesie/Poland, Castle, facade 1580-1590; probes of repair of the sgraffito plastering (2006)
• Salzwedel, St. Marien, interior, wall painting and plastering, 12th -16th century mainly; conservation-science study, concept fort conservation and restoration, pilot work (2006-2008)
• Peine, Lessingloge, concret facade, 1926; conservation-science study, concept fort conservation and restoration, pilot work (2007)
• St. Klementen/Austria, branch church, facade, interior wall paintings 15th-16th c. century; conservation-science study, concept fort conservation and restoration, pilot work, restoration of side chapel facade (2008)

Study work on a total of 30 objects in 13 countries in Germany, in 6 federal states of Austria, in Switzerland, in the Czech Republic, in Slovakia and in Italy, including: Altenesch-Lehmwerder, Altlandsberg, Badbergen, Berlin, Birseck, Burg Stargard, Dessau, Frauenburg, Freising, Gardelegen, Gimritz, Goslar, Halberstadt, Halle,