Notice when the patch changes
A patch that appears or grows after a shower can suggest water escaping during shower use. Possible routes include the tray or bath edge, joints, the waste connection and pipework. It does not automatically mean the silicone is the cause.
A leak after a bath is emptied may direct attention to the waste or overflow. Water appearing after a toilet flush gives a different clue. A stain that continues to grow when nothing is being used can justify checking concealed supply pipework as well.
Record what happened during normal use. Do not deliberately run water again to test an already leaking ceiling, especially near electrics.
Several different faults can look similar below
The bathroom floor can hide pipework and fittings, and water may follow a joist before reaching the room beneath. The visible patch may sit away from the bathroom appliance or pipe that is leaking.
Grout and sealant defects can allow water into construction, but replacing visible sealant without investigating other possibilities may leave the real cause untouched. A bath panel or service access may help a professional inspect safely; lifting floors or cutting a ceiling needs a considered access plan.
- Hot and cold supply pipes can leak at concealed joints.
- Waste and overflow connections may leak only when water passes through them.
- Shower enclosures, bath edges and surrounding construction can provide a route for water.
- Heating pipes or towel radiator connections can also be relevant.
Choose the next check carefully
An obvious leaking accessible connection is usually a plumbing repair. Where the route is concealed or previous repairs have not solved the wet patch, ADI can discuss an investigation. Let the team know which fixtures are above, how often the patch changes and whether any pipework has already been tested.
Testing is selected for the suspected system. Moisture readings can establish a pattern and thermal imaging can reveal temperature differences; neither is a photograph of a leak through the ceiling. A combination of findings is needed.
Repair the source before the finish
Once the fault has been addressed, the ceiling still needs an assessment for drying, damage and any electrical effects. A surface that feels dry may hide moisture within the void. Agree who is responsible for access, repair, drying and reinstatement before work starts.