Steinert High School in Hamilton has a growing problem.

On Monday, school officials discovered mold on ceiling tiles in the school’s science wing, which has since been closed off for cleaning.

Superintendent James Parla said classes had been relocated and a contractor was brought in to clean the wing.

“We’re not talking about weeks here, we are talking about days,” he said.

Once the contractor finishes cleaning, the wing will be tested again before allowing people back into the building, Parla said.

School principal Kelly Mattis sent home a letter to parents, that was also posted on the school’s website, which detailed the district response and the work by the contractor, Karl Environmental.

“Ceiling tiles are being replaced, and vents, grids, flat surfaces, walls and floors are being sanitized according to the direction of Karl Environmental,” Mattis said.

The letter also said the school would exercise “sensitivity” for students whose books are stuck in the affected wing.