Insulation

What should i use to insulate between the rafters in my roof?

Anonymous user 23 February 2024 - 2.37 PM

My attic has been converted into two bedrooms, I have a normal staircase leading up to it. I have 4 hatches around the side walls. Inside these hatches I have noticed,due to the wind and chills, that there is no insulation whatsoever on the underside of my roof tiles. What should I be using to insulte this and what are the legal requirements and regs. ie spacing for ventillation? Do i also need to board over whatever I use to insulate this area.Any help would be greatly appreciated as i have a roll of rockwool and was going to use this and hold it in with sheets of wood. Is this wrong? i would like to add that the conversion was signed off and certificated but was done before myself and the previous owners lived there. It must be 15 years ago. Once i've used kingspan or celotex does this then require boarding over or plasterboarding?