What material is commonly used for insulation in firestop systems?

Mineral wool is commonly used for insulation in firestop systems due to its exceptional fire-resistant properties. It is made from natural or recycled materials and can withstand high temperatures without melting or releasing harmful gases. This characteristic makes mineral wool an excellent choice for preventing fire and smoke from spreading through wall and ceiling penetrations in buildings. Its ability to maintain structural integrity under fire conditions enhances the overall safety of firestop systems, ensuring compliance with building codes and fire safety regulations. Additionally, mineral wool is non-combustible and does not contribute to the growth of mold or bacteria, further reinforcing its suitability for use in firestop applications.