The housing maintenance fund is used for major, medium and renovation projects of the main structure, public parts and public facilities and equipment of the house after the warranty period expires. The water leakage in the bathroom does not belong to the main structure or public facilities, so it cannot be used.

Can be used for housing maintenance fund projects include:

1. The main structure of the house includes foundation, internal and external bearing walls, columns, beams, floors and roofs.

2. Public parts refer to outdoor walls, hallways, stairwells, corridors, etc.

3. Public facilities and equipment refer to water supply and drainage pipelines and equipment, distribution cables and equipment, elevators, public lighting, fire-fighting facilities, green spaces, roads, ditches, non-operating parking garages, public sports facilities and other facilities and equipment used by the owners in the houses and related supporting areas.