The Ontario English Catholic Teachers' Association (OECTA) is stepping up its administrative job action next week.
The union says beginning Tuesday, February 11, it's 45,000 members will only undertake their scheduled teaching and supervision duties.
Teachers will not accept any additional tasks or assignments, but will continue to participate in extra-curricular activities.
OECTA started administrative job action on January 13 and fully withdrew services on January 21, to protest stalled contract talks with the province.
The union represents 790 permanent and occasional teachers with the St. Clair Catholic District School Board.