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.
Blown-in insulation typically lasts 20 to 30 years, but fiberglass and rockwool can last up to 50 years, though effectiveness may decrease over time.
To install insulation in a crawl space, cover the vent openings with crawl space vent covers, seal the rim joists with rigid foam board insulation, and use foam sealant to seal gaps between the crawl space wall and sill.