Can a gap in the bath sealant wet the room below while the roof is irrelevant?

What is the fuller explanation?

Sealant fails, tiles stop short, and a bath panel hides a gap at the floor. Every splash then runs into the void and finds the ceiling of the room below, often at the edge rather than in the middle. The pattern follows bath use, not rainfall. A surveyor can see missing silicone and a stained ceiling if both rooms were open. They cannot see behind a panel that was not removed, and a standard survey does not remove secured panels.

Sanitary fittings are not tested. A dry ceiling on survey day, after a week of no baths, does not clear a obvious gap. A stained ceiling under a sound roof should send you back to the bathroom, not up to the tiles. Do not retile the house, and do not treat the lower wall for rising damp. Renewing the seal is the matching repair, and any rotten boarding in the void is what a longer leak may have left. The survey has not opened that void unless it says so.

What should you ask your surveyor?

• Is there a gap in the sealant, and a room directly below?
• Does the ceiling stain line up with the bath rather than with the roof?
• Was the bath panel removed, or is the floor joint hidden?

What are the typical next steps?

1. Do not blame the roof for a ceiling stain under a bath.
2. Photograph the failed seal and the stain below together.
3. If the panel hid the joint, the survey has not seen it. Do not invent a pass.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

Which pages should you read next?

• If the underside of the roofing felt is wet on a cold morning, is that usually a leak?
• Can the chimney breast be damp inside the loft even when the pots look sound from the ground?
• Wet rot is at the window sill only. Why has the survey not condemned the floor joist behind it?
• Guide: What does damp mean in a home survey?
• All UK home survey questions

Sources

• RICS: RICS Home Surveys (Home Survey Standard)
• Property Care Association: Structural problems, including damp, dry rot, wet rot and woodworm (homeowner advice)
• GOV.UK: Damp and mould: understanding and addressing the health risks for rented housing providers