Uploaded April 2026 | Updated September 2026, 2 hours ago

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Radiant barriers are often misunderstood and improperly specified, leading to substantial long-term durability issues that manufacturers fail to disclose. The foil facing on these barriers acts as a highly vapor-impermeable Class 1 vapor retarder, which can critically trap moisture within roof and wall assemblies and inhibit drying potential. This video explains why you should always treat radiant barriers as vapor barriers, highlights common installation failures that lead to rot, and shows where they must be placed to function correctly and prevent moisture failures.

*Useful Resources & References* :
1.) buildingscience.com/documents/building-science-insights/bsi-136-piltdown-man-does-thermal-resistance

2.) osti.gov/servlets/purl/7064651

3.) https://oaktrust.library.tamu.edu/server/api/core/bitstreams/8f1846a5-d07d-4171-9399-c0fba3995be9/content
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