Background
He was born in Sannikedal as a son of industrial laborer Kristoffer Lofthaug (1864–1946) and housewife Johanne Ødefjeld (1872–1957).
He was born in Sannikedal as a son of industrial laborer Kristoffer Lofthaug (1864–1946) and housewife Johanne Ødefjeld (1872–1957).
He took a horticultural education, ending in a stay at the Norwegian College of Agriculture from 1933 to 1936. Lofthaug married Tonnie Jensen from Vennesla (1913-1994) in 1939. Together they had three children.
He was a consultant between 1936 and 1939, teacher at Tomb agricultural school from 1939 to 1946 and headmaster at Gjennestad Gardener School from 1946 to 1976.
He served as a deputy representative to the Parliament of Norway from Vestfold during the terms 1969–1973 and 1973–1977. In total he met during 305 days of parliamentary session.
Lofthaug was a member of Stokke municipal council from 1955 to 1967. He was a member of the diocesal council in Tunsberg from 1954 to 1958 and 1962 to 1966, and a member of the committee of representatives of the MF Norwegian School of Theology from 1962 to 1971.