I have an area above a ceiling that needs thermal insulation, it’s a standard construction plasterboard ceiling with joists but is mostly boarded over (in a loft) so I think it needs a system that can pump insulation in because I can’t easily take the boards up. The total area is about 25 square meters (split into two almost adjacent areas) and cavity is about 20cm deep.

The loft area above this ceiling is easily accessible through a hatch.

I’ve used a system called Warmcell in the past in another house and was happy with that, so either that or something similar.