Fr. Roggia entered the Pinerolo-Monteoliveto novitiate in 1982 and made his first religious profession on September 8, 1983, and perpetual vows on May 5, 1989, in Turin. After serving several years in Salesian houses within his Province, he embarked on a missionary journey, dedicating himself to serving poor youth in English-speaking West Africa (AFW). He worked as a Novice Master first in Ondo, Nigeria (1999–2005) and later in Sunyani, Ghana (2005–2012).

He has spent nearly 20 years in Africa, from 1997 to 2016, also serving as Provincial Delegate for Formation (2013–2016) and Vicar (2010–2016) for the AFW Province. Later, in Rome, from 2016 to 2022, he collaborated with his predecessor, Fr. Ivo Coelho, in the Formation Sector. During this period, he coordinated an extensive international research study involving over 4,000 Salesians—3,500 young members and 500 guides and formators—to deepen understanding of initial formation experiences and Salesian accompaniment in the field.

Since 2022, he has served as the Rector of the international Salesian community of theology students, Zeffirino Namuncurá, in Rome, Via della Bufalotta, and as a Councillor of the Maria Sede della Sapienza, Vice-Province at the Salesian Pontifical University.