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How do radiant barriers “block” heat?

April 26, 2017barriers block heat radiant

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How do radiant barriers “block” heat?

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The aluminum radiant barrier has two properties that enable it to effectively block heat: emissivity and reflectivity. Aluminum’s low emissivity allows it to prevent up to 97% of the radiant heat in the panel from radiating into the attic. Its high reflectivity allows it to help block heat from your living space from escaping through your roof deck to the outside.