I posted this just recently...............
Just thought I'd share this info with everyone. I've just added a
Dormer to a new upstairs room. Basically 4" x 2" (95mm x 45mm) stud
walls. I've 'stuffed' it with the following insulation called Rocksilk

by Knauf. The spec. sheet gives the following details...


UNIVERSAL SLAB RS45
Thickness 100mm (I have also used 75mm)



Length: 1200mm
Width: 600mm
Area per pack (m^2): 3.6
Lamda (W/mK): 0.035
R Value (m^2K/W): 2.85
Fire ClassSlabs per Pack: A1
Slabs per Pallet: 5
Product Code: 2361392


The price for one pack from Sheffield Insulations in Aberdeen


was ?32. So that's nearly ?10 per square metre. Quite expensive for