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I have 70mm joists in my roof space, and my insulation is about 120mm. I have been given several options by a builders merchant, as i want to board it out, so any guidence would be most appreciated. 1. Take out existing insulation and put in 70mm of xtratherm or similar and then place...

I have now emptied my loft space and want to board it all. I have noticed I have between 80 - 130mm of insulation up there. You won't get any more thickness due to the height of the joists. I am aware that you need about 270mm nowadays, but due to the joists this will not happen with the...