Teachers belonging to the ASTI have been told by the union not to co-operate with plans to teach Leaving Cert students in class from next week.
The government announced yesterday that the majority of students will be taught remotely from Monday, while sixth years are to attend school three days a week.
However, the ASTI says members should not cooperate with this instruction and should only teach remotely due to health and safety concerns.
Its standing committee made the decision this evening, saying that it had not been provided with "the necessary assurances that schools are sufficiently safe for students and teachers at this time."
ASTI President Ann Piggott said: “The ASTI has repeatedly sought sufficient assurances that schools are safe for students and teachers at this time, in the context of the new variant of Covid-19 circulating in the community and the alarmingly high numbers.
“We engaged with the Department of Education and with public health officials today. Unfortunately, the assurances we sought have not been forthcoming.”