The optimal choice for basement ceiling insulation is closed-cell spray foam. Key to basement insulation is controlling moisture, and closed-cell spray foam excels by providing a robust water vapor barrier.
If your insulation becomes wet, it's crucial to remove and replace it promptly. Wet insulation can significantly lose its effectiveness and may also pose health risks due to potential mold and mildew growth.
The thickness of R30 insulation is typically 9.5 inches. This measurement helps ensure that the insulation provides the intended thermal resistance, often used in various residential and commercial building applications to enhance energy efficiency.