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Ideally, building assemblies would always be built with dry materials under dry conditions, and would never get wet from imperfect design, poor workmanship or occupants. Unfortunately, these conditions do not exist.
Related Documents for Further Reading:
RR-0004: Air Barriers vs. Vapor Barriers
BSD-106: Understanding Vapor Barriers
RR-0412: Insulations, Sheathings and Vapor Retarders
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