Condensation on Loo dripping on the floor

[rov1100]

We are almost sure its due to the water being fed from the mains as the water is a lot colder than from the loft. Its not a simple operation to change the water inlet so we are probably stuck with the present arrangement.

What are the possible cures?

[AlBags]

Feed the loo fill with the basin cold (so long as that is tank-fed and not fed from rising mains, too)
Otherwise .. not much.

[Clanad]

Taking into account there may be differences in the toilet systems in the U.K. and here in the U.S. I'd relate that we have or I should say had the same problem but only in the summer... especially if the weather turned warm and humid. I installed some polystyrene foam insulation ( seen here: http://www.closedcell....com/polystyrene.html )inside of the tank. Pretty easy, actually. Just cut the sheet (1/2 inch thick is plenty) to fit inside. It takes foru sections. Flusht the toilet after shutting off the water supply and then use a towel to dry the inside. A little bead of sealing caulk (like used on the tub surround) to hold each piece in place ... et voila! It's been there for years and it never drips from the cold water caused condensation...

[theshedman]

I thought that most cold taps were now mains fed and Loos too. You will probably find that in the summer when the water coming in to the house is warmer you won't get this problem. If you have a radiator in the room you could try turning it off as it's usually because the room temperature is higher than the water coming in that causes it, but then you have a cold room.

[buildersmate]

It isn't directly caused by the room temperature being higher than the water temperature coming in - it is the COMBINATION of that PLUS the high amount of room water vapour in that humid loo.
The solution is to insulate the pipe in some way, such that the warm humid air in the loo cannot condense on the cold metal pipe. In the first instance try and plastic sleeve of some type.

[heathfield]

It looks like the problem's with the cistern itself, BM, rather than the inlet pipe. There's lots on Google on the subject, ('toilet cistern condensation' brings up loads of links, many with somewhat irrelevant suggestions), but the most practical answers seem to be based on Clanad's reply - insulating the interior of the cistern.

http://www.diydoctor....densationcisterns.htm

[rov1100]

Thanks for your replies