I've never heard it from anyone either. I'm just saying having something on top of the radiant barrier to collect the dust will prolong the effectiveness of the barrier, not sure if it will help insulation much. Otherwise You will be changing the radiant barrier or flipping it on the other side once it collects dust. Maybe cheap air filter material instead?
They do make "radiant barrier chips" which will stay effective even when the top is covered with dust cause You have multiple layers of the stuff, though they are more expensive.
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