When creating new openings, which method is considered the best for firestopping?

Choosing a UL System first is considered the best method for firestopping when creating new openings because it ensures compliance with established testing standards for fire-resistance-rated construction. UL (Underwriters Laboratories) has developed specific systems that have been tested for performance in real-world scenarios, providing reliable and safe solutions for firestopping.

Utilizing UL systems allows for the selection of appropriate materials and installation methods that have been proven effective in preventing the spread of fire and smoke through penetrations and openings. This approach not only meets building codes but also enhances safety and effectiveness in fire protection.

In contrast, options such as sealing gaps with generic caulk may not provide the necessary fire-resistance characteristics. Designing the penetration based on existing systems can be risky if those systems aren't suitable for the new opening, and simply covering openings with drywall does not address the firestopping requirements adequately, as it may not prevent fire from traveling through the gaps. Thus, selecting a UL system first is the most reliable and effective method for ensuring proper firestopping in new openings.