A damp ceiling below a bathroom does not always mean that every tile must be removed. The source may be a failed pipe connection, floor drain, grout joint or a waterproofing layer that has deteriorated.
How to narrow down the source
Note when the leak appears, whether it follows shower use and which part of the ceiling becomes damp first. Check accessible plumbing and sealant joints, but avoid applying a surface coating before the source is identified.
When a non-demolition repair may help
Some cases can be treated with localized sealing, injection or a compatible surface-applied system. Other cases require opening the floor or wall to repair concealed damage. An inspection helps set realistic expectations and avoids unnecessary work.
Learn more about bathroom waterproofing without demolition and ask for a site assessment.