I have what I suspect is an unusual roof construction. There is a layer of felt which would not take any water outside the house, then a layer of polystyrene insulation followed by an air gap and then concrete tiles. Can anyone tell me what the purpose of the felt is as it only seems to channel the water as far as the inside of the external wall?
Yeah, that's what I thought it might be. The tiles should keep the water out and probably did for the first 20-25 years of their life but that now seems to be coming to an end. I'm trying to postpone a new roof but it's looking more and more like that is the only option.
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