Good job OP, why didn't you use the RW5 slabs it has over twice the
density ??!
Nigel - go here - There in Nursling, I paid under 20 quid for there RW5 packs !!
Minster - Insulation and Dry Lining - Branches
Also for info:
http://www.insulationexpress.co.uk/d...semi_rigid.pdf