The recommended insulation for a valve box is PAROC Pro Wired Mat with aluminium foil facing, as it is flexible and easy to install on a round or rectangular surface.
Service and maintenance work is easy and clean to perform with faced insulation inside. You can then put the same valve box, with its insulation, back into its place.
For valves and flanges Paroc recommends you use 100 kg/m3 PAROC Pro Wired Mat with aluminium foil facing.
Install the wired mat, foil towards the valve or flange.