damp on wall behind toilet cistern

[Oskool]

I have recently had a new bathroom suite installed by a friend. Pretty much immediately after, I noticed that the wall behind the toilet cistern was getting damp. Mould is now growing on it.

I have tried sealing the cistern lid with silicone to no avail.

Does anybody know what is causing this and how I can stop it?

My friend and I are assuming that it is condensation coming from inside the cistern - what do you think?

Thanks

Neil

 

[nstreet]

It probably is condensation but not from inside the cistern. What is your cistern made from?

Its more than likely because the cistern is full of cold water, when you shower/bath the warm moise air will condense on the back of the cistern, some of this damp may transfer to the wall. This sounds like a place there isn't much airf flow, therefore the mould grows.

 

[Oskool]

It probably is condensation but not from inside the cistern. What is your cistern made from?

Thanks for your reply
Its made from porcelain.
How can i stop it? What about tiling the wall the cistern is fitted to?

 

[nstreet]

Yes tiling would stop the mould on the wall problem, but the grout would undoubtedly get mouldy instead. Stoping condensation on porcelain cisterns is a question that has been asked many times, do a search on this forum and you will find them. You could try a thin layer of polystyrene behind the cistern, but you will still get condensate on the cistern itself.
I dont think there is an easy answer.