Polyisocyanurate is a type of rigid foam insulation made from a polymer that contains isocyanurate groups. It is known for its excellent thermal resistance, making it a popular choice in construction and building applications. This material is often used in roofs, walls, and floors to improve energy efficiency. The production of polyisocyanurate involves a chemical reaction between isocyanates and polyols. It is typically available in board form and can be faced with various materials for added durability and moisture resistance. Its lightweight nature and high insulation value make it an effective solution for reducing energy costs.