1. Move people out of the area
Keep children, pets and occupants out of the room if the ceiling looks unstable, is dropping, cracking rapidly or holding water.
2. Look for the source from a safe position
Common causes include a roof leak, plumbing leak, leaking geyser or accumulated moisture. You can note where the staining starts and whether rain or plumbing use makes it worse, but do not enter a roof space or climb onto the roof to investigate.
3. Do not puncture the bulge
Puncturing a water-filled ceiling can trigger a larger collapse and may expose you to electrical wiring or contaminated water. Keep the area isolated instead.
4. Arrange the right help
A professional may need to stop the source of the water first and then assess the ceiling structure and any electrical fittings that were affected. If collapse is actively occurring or there is immediate danger, move away and call emergency services.
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