Spray foam is a type of insulation made from a mixture of chemicals that expand when sprayed. It creates a solid barrier that helps to seal gaps and cracks in buildings, improving energy efficiency. This insulation can be used in walls, roofs, and floors, providing both thermal resistance and soundproofing. There are two main types of spray foam: open-cell and closed-cell. Open-cell foam is lighter and more flexible, making it suitable for interior applications, while closed-cell foam is denser and provides a higher R-value, making it ideal for exterior use. Both types help reduce energy costs and enhance comfort in homes.