When I did my first one I used this
https://www.homebase.co.uk/knauf-earthwool-loft-roll-200mm_p394101?_$ja=tsid:%7ccid:1641 705554%7cagid:59793718061%7ctid:pla-298659004243%7ccrid:316339754527%7c nw:g%7crnd:18086554136109370262%7cd vc:c%7cadp:1o1&gclid=Cj0KCQiAhKviBR CNARIsAAGZ7CfCW8BLyGUOMrJtaipMLmHsN vStYBLWehcwMtJOe0tjkpEgTGVSodcaAhI4 EALw_wcB&gclsrc=aw.ds
Here was mine
http://www.spacegazer.com/index.asp?pageid=97497