What material is commonly used for fire stopping in wall assemblies?

Mineral wool is commonly used for fire stopping in wall assemblies due to its excellent fire-resistant properties. It is made from natural or synthetic fibers that are designed to withstand high temperatures, making it an effective barrier to the spread of fire. This material not only helps to prevent flames from passing through wall cavities but also minimizes the passage of smoke and hot gases, which is crucial in maintaining safety in buildings.

In addition to its fire-resistant capabilities, mineral wool is also non-combustible, which further enhances its effectiveness in fire stopping applications. Its sound insulation properties are an added benefit, providing an extra layer of comfort in a building. Overall, mineral wool meets the requirements set forth by building codes for firestopping measures, which is why it is widely used in construction.