Another Vapor Barrier & Insulation Question



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    Brett Bowers
    1. From what I can tell, the diagrams are simply showing the same section for summer and winter conditions in what appears to be a temperate climate. Assuming this is not a hot, humid climate, the barrier is located correctly - it's the only climate where you should locate the barrier on the exterior side of the insulation (based on my understanding).
    2. Yes, cold climates have higher recommended thermal resistance than hot climates. Consider the interior/exterior ΔT for both climates at their peak heating and cooling loads; in hot climates, your greatest ΔT during cooling months will be about 25 degrees (95-70), whereas the ΔT in cold climates during heating months will be at least double that (70-20).
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    Diane Colucci

    Thank you!

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