Between-rafters insulation

[matchmade]

I hate flat-lying loft insulation as if you follow the Government's advice and install 200mm, it goes well over the joists and makes the loft unusable for storage. I want to install good-quality insulation between the rafters and board the whole thing, obviously keeping a 50mm gap between the insulation and the slates to allow for evaporation.

A couple of questions:
- is sheep's wool insulation any good compared to Celotex or Kingspan? The cost is a little more but I'm having difficulty comparing installation time, U-values etc.
- can you still get a government grant if you do between-rafters instead of flat-lain?

[markvirgo]

you could use the 9 layer foil type insulation. easy to use and clean. not the bubble type