[2] He also served as regent of studies, director of spiritual retreats, and professor of moral and pastoral theology, Sacred Scripture, and canon law.

Rouleau was also an advocate on behalf of the Franco-Ontarian community in the dispute over Regulation 17, which forbade French instruction in Ontario schools.

He received his episcopal consecration on the following May 22 from Archbishop Pietro di Maria, with Bishops Félix Couturier, OP, and Georges Gauthier serving as co-consecrators.

Pius XI created him Cardinal Priest of San Pietro in Montorio in the consistory of December 19, 1927.

In 1930, he was dangerously bruised and cut when a blowout crashed his motor into a ditch near Levis; he received Extreme Unction but later convalesced.