SIPTU members employed by De La Salle College, Waterford are to ballot for industrial and strike action.
It follows a decision by management to unilaterally outsource their employment to a private sector provider.
SIPTU Organiser, Con Casey, said: “On Monday (15th August), our members employed as cleaners in De La Salle College Waterford, with very little notice, were informed by management, without any consultation or agreement, that their employment was being outsourced to a private service provider.
"Management has issued them with a notice stating that the transfer of employment would be effective from 17th September.
“At a meeting on Tuesday (16th August) union members rejected their unilateral transfer to a private service provider, or any other proposal that might undermine their conditions of employment in De La Salle College, Waterford.
“They also resolved to undertake ballots for industrial and/or action strike action if their employer does not rescind the notice of transfer of employment which is in breach of established industrial relations practices."