What is the most suitable firestop product for large, complex openings in concrete that does not require retrofitting?

The most suitable firestop product for large, complex openings in concrete that does not require retrofitting is firestop mortar. This type of firestop material is specifically designed to fill in substantial voids and irregular shapes while providing excellent durability and resistance to fire. Firestop mortar can be applied to various configurations and does not necessitate extensive alterations to existing structures, making it ideal for complex openings.

Additionally, firestop mortar is ideal for use in situations where there may be multiple penetrations or when creating a barrier in larger openings. Its ability to adhere well to concrete and maintain its integrity under fire conditions further enhances its effectiveness. Unlike other products, which may be better suited for smaller gaps or simpler applications, firestop mortar excels in applications where strength and fire resistance are paramount in safeguarding against the spread of fire and smoke through large openings in concrete structures.