DIY Doctor UK DIY Forums

Morning all,

I'm currently cleaning out an old loft of rubble in order to properly insulate the space. The rafters extend quite a way down below the loft floor, forming sloping ceilings in the bedrooms (see pics). Should I push insulation as far down into the voids between the rafters as I am able or do I need to consider ventilation?

Many thanks!

Hi berimitsu,
Try to get a layer of insulation down in the sloping part but leave a gap above for ventilation. You may find expanded polystyrene easier to fit.
Regards S

Thanks stoneyboy,

I understand that Celotex might do the job?

Hi berimitsu,
Yes Celotex will work but a 1.2x2.4 sheet 50mm thick will cost around £26, the same sheet in EP will cost around £17.
What you are doing is a compromise because you will never get a good fit sliding insulation panels down into place so is the extra expense worthwhile? Your choice.
Regards S