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Vapor Diffusion Ports: Air Barriers That Let Moisture Leave
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Vapor Diffusion Ports: Air Barriers That Let Moisture leave Dr. Joe Lstiburek explains what Vapor Diffusion Ports are, how they work, why they're needed, and how to construct them—in about nine minutes. The skinny version: they're like a modified ridge vent but for an unvented roof. They allow moisture to escape unvented roof assemblies without letting air leak out.
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