Hi everyone,
I`m redocorating the house, and have damaged some reflective material while
removing it from behind a radiator. It`s a foam type material with a foil
covering on one side, to reflect heat from the wall. IIRC when it was first
put there it did make a difference to the temperature in the room, so i`d
like to replace it. Any ideas for a cheap source of this stuff?

Thanks in advance for your help!