Extensive mould issues at a Montreal school have left the building beyond repair, forcing the school board to tear it down and rebuild it.

Montreal's French school board (CSDM) announced today it will tear down Rosemont's École Baril and rebuild it in a $16 million project.

The staff and students of the original École Baril have been hit with a series of unfortunate events ever since they were first forced to leave the school in October 2011 because of mould issues.

They first relocated to École Hochelaga, but mould was later found at the Hochelaga facility, forcing them to relocate once again to École Louis-Riel.

In January, at least 10 staff members at the École Louis-Riel reported being sick because of poor air quality, the result of an old ventilation system that had not been cleaned for decades.

Daniel Duranleau, president of the CSDM, said the new school will be a step in the right direction.

"This new school will guarantee a healthy environment for our students and teaching staff," he said.

Diane Beaudet, school council president, said parents are excited to have a neighbourhood school once again.