Forums DIY House insulation improvements? Reply To: House insulation improvements?
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I would say board over the loft insulation – it adds another layer of thermal barrier. Use the stilt things (or other method) to stop compressing the insulation, obviously.

My loft is all insulated with 300mm of wool, then the central bit that’s used for storage has boards and then a pile of stuff. The rest of it isn’t boarded, mainly due to avoiding the light fittings and lack of time to cut boards around them, but the insulation is covered in large sheets of polystyrene from flat-pack furniture and bubblewrap.