Weidemann was also commissioned for a number of permanent installations, such as the stained glass in the basilica in Steinkjer, Steinkjer Church (1965), Mai inside the concert hall at Maihaugen in Lillehammer (1967), Alf Bjerckes Fabrikker in Alnabru (1960); Norsk Hydro’s headquarters building in Oslo (1960–1961), Alfaset Chapel in Oslo (1971) and the M/S Royal Viking Sea (1973).
For the next 20 years, he served as pastor, revivalist preacher and local politician in Steinkjer, Eidanger, and Arendal.