Porous Porcelain?

Richard wrote: [snip]

I'm no expert, but it doesn't sound likely. The problem is much more likely to be a crack or a small leak in the coupling between the cistern/down-pipe that's allowing water to run down the outside of the pan at the back to the floor when the toilet is flushed.

Mike

Unlikley BUT I had a similar situation...turned out to be a slow leak from the bog-cistern coupler.

============================== It's quite likely that there was no CH in your house for the first 30 years of its life - so plenty of time for condensation and consequent damage to the floor.

Cic.

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Not so. In time the loo will warm up to the ambient.

You only gate bad condensation on a loo in a warm steamy room just after its flushed, when cold water comes in to fill the cistern.

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True

- so plenty of time for condensation and consequent damage to the

But I exposed the (dry) floorboards in that bathroom in 2000 when I removed the lino and black/white vinyl floor tiles. All was dry then

TA

Richard

That's what I expected.

I have carried out a few trial flushes with a hand around all the joints without finding any leaks.

There _is_ line of bubbly paint on the underside of the cast iron pipe to the soil stack, but there is no corresponding damp where the pipe goes through the wall.

Ta

Richard