Which statement about gypsum wallboard under fire is true?

Prepare for the IFSTA Firefighter II Exam with flashcards and multiple-choice questions, each offering hints and explanations. Get yourself ready to succeed!

Multiple Choice

Which statement about gypsum wallboard under fire is true?

Gypsum wallboard serves as a fire-resistive barrier, but its protective layer can be compromised when exposed to heat. In a fire, the gypsum core loses moisture and the board can soften, crack, or spall, and the facing materials can burn away. When that protective layer is breached, the structural members behind it—such as studs or framing—are exposed to heat and flame, increasing the risk of damage and fire spread. This is why the statement about exposing structural members as the protective layer is compromised is the best choice. It does not expand and strengthen under fire, it does not remain protective under all fire conditions, and it does not melt.

Gypsum wallboard serves as a fire-resistive barrier, but its protective layer can be compromised when exposed to heat. In a fire, the gypsum core loses moisture and the board can soften, crack, or spall, and the facing materials can burn away. When that protective layer is breached, the structural members behind it—such as studs or framing—are exposed to heat and flame, increasing the risk of damage and fire spread. This is why the statement about exposing structural members as the protective layer is compromised is the best choice. It does not expand and strengthen under fire, it does not remain protective under all fire conditions, and it does not melt.

More practice questions