Hi, got an insulation query for brick outer & block inner cavity walls. It looks like we need Celotex CW4060 60mm x 1200mm x 450mm slabs to do this which will cost thousands for a total wall area of 30x2.4 meters.
But Celotex also sell 60mm x 1200mm x 2400mm GA4060 that will only cost hundreds to cover the same area & it says its for all areas (wall, floor, ceiling) . both will give the same UV .
Can anyone through any light on this.
Also can you say how this is signed off by the local DS.