He was born at Østre Moland as a son of bailiff and politician Ivar Guttormsen Fløistad (1846–1926) and Ingeborg Herveland (1844–1939).
Kateraas was a former mayor of Aamli, but Fløistad carried that district as well as Lille Topdal and Froland—on the other hand, Kateraas carried Fløistad's home district Østre Moland as well as Gjøvdal, Tromø, Hisø and Øiestad.
[6] In the 1921 election, plural-member constituencies had been introduced and Fløistad headed the Social Democratic ballot for Aust-Agder.
[7] Many years later he served as a deputy representative during the term 1945–1949, but this time for the Conservative Party.
[1] In the 1949 election he was promoted to head the Conservative Party ballot for Aust-Agder, but Labour swept three of four seats with the last going to the Liberals.
Fløistad was a board member of the trade union Norges lensmannslag, and chaired it locally in Aust-Agder from 1924 to 1939 and 1946 to 1948.