Posted Jan 15, 2020, 4:01 PM
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Registered User
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Join Date: May 2018
Posts: 82
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The yellow is the air barrier system (appears to be fluid-applied) which is required by the energy code. In the past, people would use "waterproofing" or "tar paper", but these items have all been replaced with water-based liquid or (shudder) sheet air barriers.
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