Quote:
Originally Posted by ctgottapee
...You want the final underfloor foil based poly-iso to have the foil side facing down, not up...
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Please help me understand this...
In my understanding, the reason for insulation is to slow, as much as possible, the passage of heat energy from the interior of a dwelling, to the great heat-sink in the sky.
Regarding the foil layer of the last poly-iso, it seems to me that having the foil facing "in" would help reflect the radiant component of heat, back into the insulation assembly.
Having the foil facing "out" would help reflect the radiant component of the meager energy in the crawl space, back into the crawl space, and away from the insulation assembly.
Please clarify.
-AC