Fiberglass batt insulation installed upside down—especially kraft-faced insulation—can create moisture problems and reduce thermal performance. The paper vapor retarder must face the conditioned living space. When installed incorrectly, moisture can become trapped in wall or ceiling cavities, increasing the risk of mold growth, insulation deterioration, and reduced energy efficiency. Proper orientation is critical for insulation performance and building durability.
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Fiberglass batt insulation installed upside down—especially kraft-faced insulation—can create moisture problems and reduce thermal performance. The paper vapor retarder must face the conditioned living space. When installed incorrectly, moisture can become trapped in wall or ceiling cavities, increasing the risk of mold growth, insulation deterioration, and reduced energy efficiency. Proper orientation is critical for insulation performance and building durability.
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