If what your talking about is anything like Plyfoil, then I wouldn’t bother. At most its a reflective layer for radiant heat and not really that good a one.
I wasted the time of insulating our shop with it, while it most certainly helps, if you look closely on any of those foil-bubble-foil products they’ll only give you an “*estimated R value” as they know if it’s tested like “real” insulation it will fail horribly. Should have saved all my dimes and quarters and just had the inside of the barn sprayed with a few inches of closed cell instead.