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.
The thickness of R49 insulation is typically around 14 inches. This measurement ensures that the insulation provides high thermal resistance, commonly used in attics and other areas requiring significant insulation to enhance energy efficiency and comfort.
Remove as much spray foam as possible with a scraper or blade, then use a rag dampened with mineral spirits or acetone to clean any remaining residue from the surface.