Rigid insulation is a type of insulation material that comes in solid panels or boards. It is designed to provide thermal resistance and is commonly used in walls, roofs, and foundations. Made from materials like polystyrene, polyurethane, or polyisocyanurate, rigid insulation helps to reduce energy costs by minimizing heat transfer. This insulation is known for its high insulating value per inch of thickness, making it effective in tight spaces. It is also moisture-resistant, which helps prevent mold and mildew growth. Rigid insulation is often used in both residential and commercial construction projects for improved energy efficiency.