Insulating tight space

[JohnH165]

Hi folks,

Looking for a bit of help around insulation. We moved onto our house a few years back and have finally got round to installing loft insulation. We have a converted loft which isn’t really being used as it should as it’s always freezing up there with no heaters/ insulation. As you can see by the picture below there is a small gap of around 10cm max between the loft roof and the felt on the main roof.

Never needing to do anything with insulation before, I’m a bit stumped as to the best type of insulation to use and how to get it in there? I’m a bit worried I might need to take off the boards inside the loft itself and install from the inside?View attachment 294528

 

[freddiemercurystwin]

Typically for a loft conversion roof you would fit 50mm PIR insulation (eg Kingspan) between the rafters leaving an air gap above, then fit a continuous layer of about 100mm PIR insulation to the underside of the rafters + plasterboard. Unless there is a breathable membrane under the tiles you would need continuous vents at the eaves and the ridge.

BTW you photo is not showing.

Is this a bona fide loft conversion or what?