hi. we are going to improve our attic insulation. currently we have 100 mm fiberglass and part of the attic has floor boards as we'd like to have some storage. We are thinking of putting extra 200 mm of recycled plastic insulation or fiberglass (any opinions on recycled plastic - which is better?). Regarding the part that is boarded we are going to remove the boards and add 50 mm of khauf spaceboard insulation from B&Q and also leave 100 mm remaining fiberglass there. My question is - is it a good idea or is fiberglass going to be squashed and ineffective? should we remove fiberglass from that area all together and put in 100 mm of spaceboard? - this is quite an expensive option which I'd rather avoid. Or is there a way of heightening the boards between insulation so the floor boards will lay higher and just put in another 200 mm of normal fiberwool/recycled plastic? Any advice would be much appreciated. cheers