Surviving high heating oil prices
krw wrote:
... The reflective barrier will not keep heat in; zero R value.
It will *reflect* IR radiation and is useful in areas with
lots of sun, but it adds zero to the R value.
Wrong.
Not wrong. Foil does nothing to "resist" the conduction of heat
therefor has no "R" value. It will REFLECT radiated heat, but do
ZERO for conducted heat.
With an air gap, the foil adds a real R-value.
Nick
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