Scoil Mhuire in Carrick-on-Shannon is calling for a commitment from the government on a new site for the school.
The national school's pupil numbers have doubled over the past 10 years.
But it has been forced to sub-divide classrooms and accommodate classes in pre-habs, as it waits for a new school building.
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Ahead of the school reopening in two weeks' time, Eoghan Murphy visited the school this morning to speak about their campaign.
He first spoke to the principal, Caroline Healy, who told him about the growth over the past 10 years.