One other thing that puzzles me is the fact the steel been in the ceiling (behind the ceiling plasterboard) appears to be uninsulated - I borrowed a heat camera and it clearly stands out! Should this have a layer of insulation over it?
Thanks for identifying what the plastic is/is used for and your advice about not taping it together. RE the purpose of the eaves storage – I only use it for storage (Christmas tree, suitcase, usual loft stuff!) but I’m convinced it’s at least part of the cause of the loft bedroom temperature...
Lay it on top of the boarded floor? The wool type?
What about between the rafters? Or should I try laying insulation on the boarded floor first and seeing how much difference it makes?
I live in a mid-terrace house with a loft conversion done in 2006 (way before I bought the house). The loft room walls and ceiling are insulated with some sort of Kingspan stuff, but the eaves storage area (accessible via a cupboard/hatch) doesn’t seem to have any insulation at all other than...