That system was made up of commonly used materials - rigid foam insulation board, separated by an air vent from rainscreen aluminium cladding.

One or more layers of insulation board or foam are added on the outside of the waterproofing.

I then put insulation boards between the rafters in the cellar to stop cold air whistling through the floorboards.

As an added benefit, insulation boards can be placed beneath.

They were also helped by the insulation boards behind the cladding panels and the window surrounds, both of which had combustible materials.