R21 insulation is approximately 5.5 inches thick. This type of insulation is often used in walls and provides a higher R-value compared to standard insulation options, contributing to improved energy efficiency and thermal comfort in residential and commercial buildings.
Fiberglass insulation usually needs replacement after 15-20 years as it can become dirty, wet, moldy, and less effective.
To remove wet spray foam from your hands, apply acetone or nail polish remover to a cloth and rub gently. Wash with warm water and soap, then apply a moisturizer.