Looking for advice on the best way to increase the insulation in our converted attic which serves as a bedroom and is freezing in winter, boiling in summer. There are crawl spaces down each side and there seems to be little or no insulation between the rafters. Basically the ceiling in the attic has been slabbed and plastered, but when you go in to the crawl space on either side and look up towards the apex you can see up between the rafters and could possible shove something or pump something up. As only the crawl space parts of the rafters are accsesable how should I go about insulting. I could cut up sheets of Kingspan or something and shove it up behind the plastered part of the roof from the crawl space in between each rafter. Though I would probably not get it to insulate the apex. Or should I look at blocking off the spaces between each rafter in the crawl space and slabbing with plaster board on to rafters exposed in crawl space and pumping cavity wall insulation up to the roof part that is not accessable? Sorry this is hard to describe. Any ideas welcome. Need to do something soon as its getting very cold.