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Richard,
Thanks, I do understand the issues and I will save a print-out of the dialogue that we have had for reference.
I went back to the house at the weekend and spent some time in the loft - more to do with a partition wall that I building for my son than to do with the damp in the ceiling.
However, I made a couple of observations whilst I was there. Firstly, the house and all the nearby houses appear to have no ventilation to the roof at all. At least, no vents of grills in the soffit boards. They all look completely sealed at the bottom of the roofs. I looked at the gable ends as well, just in case they were vented that way, but they are not. I can't see any obvious ventilation. Ever heard of that?
Secondly, I was wrong when I said that there was no felt under the tiles. I was correct that in some places there is nothing, but mostly there is a material that I don't recognise where the felt normally is. It looks like a brown oily paper stuffed with something that looks like horse hair.
I didn't tear any of this stuff off to properly examine it, but does anybody have any ideas what this might be? It's clearly doing the same job that felt is supposed to do.
Thanks again.
I don't know what your brown oily paper is, but somebody will.
Even though the soffits have no obvious vent, you might find that sufficient air gets in through gaps. If not, you can install soffit vents, which are just little round plastic vents.
Have you tried exploring the loft on a windy day to feel if air is blowing in and circulating anywhere?
I'd suggest asking a builder to have a look at it. Could be a bit hit and miss; a good builder, or one who is a friend, could give sound advice, but in my experience some builders are prone just to stuff holes in a fairly unscientific way.
Cheers
Richard