Which of the following methods is valid for establishing fire resistance of a building element?

The correct answer encompasses all the methods listed, highlighting that each can validly establish fire resistance for a building element.

Fire-resistance designs documented in approved sources provide established benchmarks and guidelines that have been recognized for their effectiveness in ensuring safety against fire. These documented designs are typically found in codes, standards, or regulatory guidelines, providing a reliable reference for construction practices.

Calculations in accordance with Section 722 contribute to establishing fire resistance by allowing inspectors and builders to assess the fire rating of materials and systems based on their response to specific fire exposure conditions. This section typically includes methodologies that help determine performance criteria through engineering calculations, ensuring that building elements meet necessary standards for fire resistance.

Fire-resistance designs certified by an approved agency serve as a robust means to validate that a building element meets requisite fire resistance ratings. These certifications are typically conducted by recognized third-party organizations, adding an extra layer of credibility and assurance to the designs employed in construction.

Each of these methods plays a crucial role in ensuring the safety and compliance of building elements with fire resistance requirements, and together they provide a comprehensive approach to establishing fire safety in commercial construction.