insulating a sloping roof and inaccessable loft space

3 Feb 2012
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United Kingdom
Hi, I am renovating an 1880s farmhouse, the rooms at the back have a sloping roof which there is no access too, I am thinking of installing Kingspan K18 insulation backed plasterboard and perhaps more kingspan above in between the joists, would this cause condensation issues?

Where the roof flattens out in the bathroom (goes from sloping to flat) there is a small loft space which is inaccessable normally, the wall in this loft is single brick and is the upper part of the bedroom wall on the other side (split levels) if I were to insulate this wall from the loft side whilst I had the bathroom ceiling down would it cause condensation problems on the bedroom wall?

any help would be greatly appriciated, many thanks
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