Masks will be required at all times for all students and staff in schools operated by Edmonton Catholic Schools, including during classes, the division announced Monday.
The division cited an increase in COVID-19 cases among Alberta children in tightening masking requirements for students and staff in kindergarten through Grade 12.
The revised back-to-school guidelines were issued Monday.
Masks will not be required during physical education or music classes or while students are outdoors, the board said in an updated back-to-school plan emailed to parents and guardians.
"Since the release of our back to school plan on Aug. 16, there has been a significant upward trend of COVID-19 cases among school-aged children," reads the revised plan. "Therefore, we are increasing our masking requirements."
Under the previous plan, masks would have been required in common areas and on the bus for all staff and students in grades 4 to 12. Younger students in Catholic schools would have only been required to wear masks on the bus.
The provincial government has removed masking requirements in schools. Face coverings will remain mandatory on school buses and transit until Sept. 27.
Children are returning to classrooms this week as cases of COVID-19 surge across the province. Alberta is leading the country in daily new cases and hundreds of children are among the newly infected.
According to the latest numbers from Alberta Health, there are 469 active cases of COVID-19 among children aged five to nine. There are an additional 1,187 active cases among Albertans aged 10 to 19.
In addition to masking, pupils and staff must screen themselves daily for potential symptoms of COVID-19, and isolate at home if they are sick.
Many students will be grouped into cohorts for another year, when possible. There will be staggered arrivals and increased hygiene protocols in a bid to limit potential spread.
Students will be monitored for symptoms of COVID-19 and daily screening will take place.
Edmonton Public Schools will require staff and students to wear masks. The rule will apply to students in pre-kindergarten to Grade 12 who are developmentally able.
The boards are taking differing approaches to case notification as Alberta Health halts contact tracing in the classroom. This school year, schools and Alberta Health Services (AHS) have no obligation to share information about positive cases.
Alberta Health will, however, continue to investigate outbreaks and work with division officials to determine if additional measures are needed.
At Edmonton Catholic schools, guardians are encouraged to report confirmed cases to school administration. School officials will then evaluate the need for notices on a case-by-case basis, with the advice of health authorities.
In public schools, if a family or staff member notifies them of an AHS lab-confirmed case of COVID-19, a letter will go home to families in the affected classes.