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^^ The only comment to the above is that the IR radiation has to penetrate the roofing to get to the radiant barrier, after which it gets reflected and returns the same way. In effect, it goes through the roofing material twice, leaving some of its energy (heat) in it each time. This can make the roofing warmer than without the barrier, and the higher temperature can shorten its lifetime.
This is why it is better to reflect heat closer to the source.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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