What type of materials are typically used in a fire-resistant assembly?

Fire-resistant assemblies are crucial in building design as they help to prevent the spread of fire and protect structural integrity during a fire incident. Non-combustible materials are specifically utilized in these assemblies because they do not ignite or burn under normal fire conditions, which is essential for maintaining safety and compliance with fire codes and standards.

Non-combustible materials such as concrete, steel, and mineral-based products can withstand high temperatures and are effective in forming barriers that slow down or stop the progress of fire. By using these materials, fire-resistant assemblies can meet the required fire-resistance ratings that are determined by building codes and regulations.

Materials that are flammable, such as those mentioned in the other choices, do not provide the same level of protection. Wood and fabric can ignite easily and contribute to the fire spread, while plastic composites can melt and release harmful gases when exposed to fire. Therefore, the use of non-combustible materials is essential in ensuring that fire-resistant assemblies fulfill their intended purpose of protecting lives and property during a fire emergency.