Bad smell

[Sandyallen]

I have a bungalow.
Toilet capped off and boarded over with flooring on. Had drains cleared as new toilet (in different room) blocked. Since then foul smell in original toilet room. Had plumber go under floor (via bedroom) to investigate and he found crack at end of old toilet pipe. Sealed it, but it still smells. It seems to be since blocked drains were cleared. Any ideas, please?

 

[Cubist]

I'm guessing but I suspect that the new toilet was connected to the foul waste pipe previously used by old toilet that was capped. It's possible that the efforts to clear the subsequent blockage disturbed or even broke that connection thus allowing noxious gases and perhaps fluids to escape under the floor. You should consider contacting your Environmental Services team at the councils offices and get a good plumber to look into and fix this based on their advice.

 

[malcolm]

The foul drain to a disused toilet should be removed and not just capped off. Building regs are quite useful with their foul drain document H and it's well worth reading through to see what else the plumber might have messed up: https://assets.publishing.service.gov.uk/media/5a80cf9ded915d74e33fc8ae/BR_PDF_AD_H_2015.pdf You don't leave unused foul drains in place.

Instructing a different plumber will probably be a good idea, but it's worth having a read of the building regs to understand it yourself so you don't get the run around again.