What will happen to gypsum board that is exposed to fire for a prolonged time?

When gypsum board is exposed to fire for a prolonged period, it will fail due to its composition and the properties of the material. Gypsum board, commonly known as drywall, contains gypsum, which is a mineral that can withstand fire to some extent due to its ability to release water vapor when heated. However, over time and with prolonged exposure to high temperatures, the structural integrity of the gypsum board will diminish.

As the fire's heat continues to affect the gypsum board, it will lose its strength and ability to provide fire resistance. The material will begin to break down, leading to physical failure where it can collapse or become ineffective as a barrier against fire. Gypsum board is typically used for its fire-resistant properties, but these characteristics are qualified and can be compromised if it is exposed to severe heat for too long.

This outcome is important in fire protection and safety, as the failure of gypsum board can contribute to the spread of fire and smoke, posing a greater risk to occupants during a fire emergency. Understanding the limitations of materials like gypsum board is crucial for effective fire prevention and response strategies.