Yes, I meant as insulation, vapour barrier function is also required, blocks infiltration like a plastic dropcloth but that is different,
the reflectivity aspect is what's overrated,
that's also not insulation, radiant barrier
and only effective in very specific installation criteria irrelevant for space-constrained mobile
the reflectivity aspect is what's overrated,
that's also not insulation, radiant barrier
and only effective in very specific installation criteria irrelevant for space-constrained mobile