The misconceptions and bogus advertising of foil bubble wrap still goes on apparently, please be aware that foil bubble wrap was never created to replace insulation materiels and has far less insulating properties than the same thickness of a real insulation such as polystyrene, PU foam or rock wool, even cardboard. Nailing a wool blanket to the wall would provide more insulation than foil bubble used on its own.
Foil bubble wrap is a RADIANT BARRIER which is designed to reflect radiant heat in conjunction with thick insulation materiel which slows heat transfer by conduction, it is an add on product to ( marginally ) increase the performance of insulation, mostly in roof spaces, the actual bubble wrap is just a convenient and cheap carrier for the reflective foil its not meant to do anything else except stop it ripping and making it easy to staple to rafters.
There are too many websites to list that explain this better than I can, so I leave it up to you if you want to Google it.