How Long Does It Take Wet Insulation to Dry? Wet insulation can take anywhere from 24 hours to several days to dry, depending on the type of insulation, the amount of moisture, humidity levels, and ventilation. While some materials may recover if dried quickly, others especially fiberglass or cellulose can lose their insulating performance or develop mold if left wet for too long. If your insulation has been soaked due to a roof leak or flooding, it's important to inspect it promptly and replace any damaged sections to maintain your home's energy efficiency and indoor air quality. Visit for more details: https://neworleanspelicansclub.com/read-blog/15032