Rigid foam is a type of insulation material made from various polymers, such as polyurethane or polystyrene. It is characterized by its solid structure, which provides excellent thermal resistance, making it effective for reducing heat transfer. Rigid foam is commonly used in construction, refrigeration, and packaging due to its lightweight and durable properties. This material is available in sheets or boards, allowing for easy installation in walls, roofs, and floors. Rigid foam is also moisture-resistant, which helps prevent mold growth and enhances energy efficiency. Its versatility makes it a popular choice for both residential and commercial applications.