Hello I am looking to insulate a garage roof which has battens at approx 450mm I noticed bandq sell 200mm rolls of loft insulation for £20 but it's 1100mm wide there does appear to be a cut line on the packaging but is this a viable option and what's the best way to cut it I am a proper old women when it comes to ppe so I have all the gear to avoid fibres but I have no idea how to cut something that thick many thanks mark