Los Angeles Unified School District officials estimate another $40 billion is needed to replace roofs, upgrade plumbing and repair hundreds of aging campuses  – but first they’ll need the voters’ blessing.

On Tuesday, the school board is scheduled to consider a $22.4 million request to address antiquated heating and cooling systems, failing walls, deteriorated pavement and broken fire alarm systems.

The request covers projects at seven schools, barely making a dent in the district’s estimate of need for 13,500 buildings.