Have a new build bedroom extension that I am told has to be insulated on the interior of the external walls to neet Building Regulations.
The walls are brick exterior with Rockwool cavity fill and Thermolite interior.
What thickness Cilotex board is required to satisfy Building Reg's and what size batterns (do i need an air gap?).
Advice appreciated
The walls are brick exterior with Rockwool cavity fill and Thermolite interior.
What thickness Cilotex board is required to satisfy Building Reg's and what size batterns (do i need an air gap?).
Advice appreciated