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@datarebal So if I asked them to build a warm roof construction, they would fill the space between the rafters with mineral wool, cover with a VCL and then plasterboard on top, without any need for ventilation? The current vents to the eaves would be blocked by the insulation and VCL?

Thanks @alastairreid. In regards to my first questoin, we have been told that mineral wool is breathable and therefore the usual 50mm gap recommended behind celotex isn't required. Is this correct?

Hi, we are hoping to insulate the rafters of our loft and I am looking to sense check some facts a few of the builders have told us. Our (currently cold) loft is a pitched roof, set on an A frame with purloins. Built about 1920/1930ish. It has ventilation in a few places at the eaves, but not...