May be the Hiram Moffatt who started a lumberyard in Watford in 1939.
J. Keith Moffatt and Melvin Powell founded Moffatt and Powell Lumber in 1956. This continued until the early 2000s, when the Watford head office closed and moved to its new location in Strathroy.
other Moffatts buried at St James Cemetery:
Glen M. Moffatt (1916-2000) m. Merlene M. Matthews (1920- ); married 60 years
James Lloyd Moffatt (1919-2002) m. Marie Ogg? (1917-2007)
their son Roger Lloyd Moffatt (1948-1949)