Comprehending Spray Foam Insulation  A state-of-the-art technique for insulating residential and commercial buildings is spray foam insulation.. It combines two primary chemicals—polyol resin and isocyanate—that expand on contact, creating a dense, air-tight seal when cured. This expansion allows spray foam to penetrate small cracks and hard-to-reach areas, minimizing air leaks and boosting energy efficiency. Spray…