MarkH395

I currently have about £18k in insulation for the conversion so hopefully that will be enough to keep me warm! The next thought is do I put the stud walls up first or insulate the roof first. Will insulating the roof make it difficult to get a good fixing at the top of the stud walls?

Is underslung the correct term for attaching the insulation board below the rafters? Headroom won’t be an issue as it’s a vaulted ceiling. The insulation I have is kingspan therma pitch 100mm and 42.5 insulated backed plasterboard as specked by the architect. Would you use 25x50mm battens to hold up the insulation then screw the plasterboard to the battens?

Hi all I have started to convert an old barn into a 2 bed bungalow that will have vaulted ceilings through the majority of the building. I’m getting towards the point of needing to insulate the roof. The plans say in put 50x50mm lengths of wood up the existing 100x50mm rafters then insulate between and then overboard with insulated backed plasterboard. It wouldn’t be bad in a new build to do it this way but the old rafters are all slightly off spacing, are twisted and not square. (200 year old building, nothing is square) my idea was to just to screw the 100mm insulation directly to the rafters, maybe add a layer of OSB board below that then insulation backed plasterboard below that. the osb board would be there to provide a fixing point for the plasterboard and light fittings attached to the ceiling. any advice or ideas would be appreciated