The head of Tasmania's Anglican Church has backed the leadership of Launceston Church Grammar School which faces strike action by staff.
The Independent Education Union will on Monday apply to the Fair Work Commission for an order to take protected industrial action.
If the order is granted, a ballot of staff at the school will be conducted by the Australian Electoral Commission on whether they support a full day strike or stopworks.
As several frustrated staff complain of poor pay and lack of consultation, the Anglican Bishop of Tasmania Right Reverend Dr Richard Condie strongly endorsed the headmaster Richard Ford.
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"While this is a matter for the school, I am fully confident in the board and headmaster of Launceston Church Grammar School," Bishop Condie said.
"The directives for change given to the headmaster by the board are already achieving beyond what the school has ever achieved.
"They have my full support."
Independent Education Union assistant secretary for Victoria and Tasmania David Brear said he was confident the Fair Work Commission would this week agree to the order.
He said 55 staff at two meetings of Grammar's junior and senior schools on Friday had voted to support the application for the order.
They also had expressed dissatisfaction with the school's senior leadership.
"They supported a no confidence motion in the school's leadership," Mr Brear said.
"Their wages don't compare with other independent, Catholic or government schools and they want to be consulted before changes are made.
"Friends and Scotch Oakburn are paid much better money."
Mr Brear said wages for general non-teaching staff also were less that in government and Catholic schools.
"Teacher assistants have virtually been told 'if you don't like it, you can go somewhere else'," he said.
Teachers also want a consultative committee of staff and senior leaders set up as a forum to discuss any changes.
""We've tried to talk to the board about the lack of consultation and haven't had a response," Mr Brear said.
Mr Ford has rejected suggestions of high staff turnover and low staff morale.
He said the school was midway through enterprise agreement negotiations and the school expected cuts to federal funding.
"We are in a period of renewal and change which is appropriate given we have enjoyed reasonable stability as a school over the last few decades," Mr Ford said.
"Given the ongoing EBA negotiations no further public comment will be made at this time."
The board also has endorsed Mr Ford.
"The Launceston Church Grammar School Board is proud of our School's many achievements under the leadership of Headmaster Richard Ford and values enormously the incredibly important work our talented and committed staff do every day," it said.