Teachers at St Aloysius School in Islington, north London, are expecting to strike on Wednesday and Thursday of next week.
The workers, in the NUT union, are in dispute over the safety of new school buildings.
Teachers also plan to lobby the council’s executive on Thursday evening at Islington Town Hall from 6.30pm.
Teachers and parents from Moreland school, which is threatened with closure (see below), and teachers from Central Services, who are facing the sack, will join them.
Workers at St Aloysius took four days of strikes in the summer. They postponed a planned strike in September for talks with school management.
But workers now say conditions are worse than they were in the summer.
Private company Balfour Beatty built the new buildings. Teachers, parents and the local MP Jeremy Corbyn were told that old buildings could not be retained because Balfour Beatty would then be entitled to huge penalty payments.
Yet a freedom of information request has since shown that no payments were payable—adding to the fury of workers, students and parents.