Ferdinand Posted December 17, 2016 Share Posted December 17, 2016 I have 2 bay windows of which the roofs are approx 70mm thick from inside to outside, including plasterboard below and lead above. How much insulation will that have? Guessing, I make it perhaps 25mm max. This was built in 2007-9 ish, Cheers Ferdinand Link to comment Share on other sites More sharing options...
ProDave Posted December 17, 2016 Share Posted December 17, 2016 If it was that recent then I would have hoped they would have made the roof a lot thicker and put a decent amount in. But knowing mass market builders it might not have any (as my 1930's semi didn't, until I put some there) Link to comment Share on other sites More sharing options...
Ferdinand Posted December 17, 2016 Author Share Posted December 17, 2016 IT is actually a self-conversion, but the measurement was inside/outside so it should be quite accurate. I guess if I was making a bay window I would put 75-100mm celotex in there. Ferdinand Link to comment Share on other sites More sharing options...
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