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I am thinking of adding a loft conversion to my 1950s bungalow. On inspecting the roof, the tiles appear to be in good condition but the old original underfelt has repairs all over it. There are no leaks which I can see. I understand that holes in the felt are not all bad as they can supply plenty of air into the 50mm gap required by building regs between the tiles and insulation and many houses built prior to 1930 didn't have any underfelt anyway! Also I reckon the insulation will stop the flexing of the felt on windy days and may actually help preserve it.
But here's the rub! With old 1950s underfelt it is obviously breaking down and will continue to do so. So, if I do spring a leak via a cracked tile and water does manage to get between the tiles and insulation I won't see it, as even the plasterboard will be foil backed.
The question is, should I have it re roofed (will obviously cost me an arm and a leg) or just go ahead and hope for the best, or is it not really an issue? I will be interested in any comments or thoughts on it.
But here's the rub! With old 1950s underfelt it is obviously breaking down and will continue to do so. So, if I do spring a leak via a cracked tile and water does manage to get between the tiles and insulation I won't see it, as even the plasterboard will be foil backed.
The question is, should I have it re roofed (will obviously cost me an arm and a leg) or just go ahead and hope for the best, or is it not really an issue? I will be interested in any comments or thoughts on it.
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