What is the purpose of fire stopping around penetrations in fire-rated assemblies?

• A. To preserve the integrity of the barrier by sealing penetrations from pipes, ducts, and cables that cross barriers.
• B. To create decorative openings for aesthetics.
• C. To allow more air leakage.
• D. To increase structural load.

Answer: (A)

The main idea is to maintain the fire resistance of a barrier by sealing openings where pipes, ducts, and cables pass through. Penetrations in fire-rated assemblies are weak points where flames, heat, and smoke can travel if not properly sealed. Fire stopping fills and seals these gaps so the barrier can continue to resist fire for the required period, keeping compartments separate and protecting occupants and adjacent spaces. The materials and installation are chosen to match the fire rating of the assembly, preventing flame spread and limiting heat transfer through the opening. Decorative openings, allowing more air leakage, or increasing structural load do not support the goal of preserving the barrier’s integrity in a fire.