There won't be a 'one size fits all' solution for social distancing in schools according to the INTO.
The union has also raised concerns about funding for extra staff should they be needed when schools re-open.
It has been reacting to guidelines issued by the Department of Education for the re-opening of schools.
Social distancing won't be essential for children in the first four years of schooling.
Third class to sixth class children will be asked to keep one metre apart.
While secondary pupils are asked to keep two metres apart, if that's not possible one metre will be sufficient.