Which of the following standards must be adhered to for gypsum board used in fire-resistive construction?

• A. All gypsum board types can be used interchangeably
• B. Only specific thicknesses are approved for residential use
• C. Proper type and thickness must align with occupancy classification
• D. Installation can vary by region without consequence

Answer: (C)

The requirement that proper type and thickness of gypsum board must align with occupancy classification is essential for ensuring that fire-resistive construction meets safety standards. Different occupancy classifications have specific fire-resistance rating requirements based on the intended use of the building. For example, commercial buildings may require thicker or harder types of gypsum boards compared to residential buildings to resist fire for a specified duration. This adherence to code ensures that the materials used are sufficient to protect structural integrity and provide safety for occupants in the event of a fire.

The other options suggest practices that either contradict building codes or promote unsafe construction methods. Using all gypsum board types interchangeably disregards the necessary properties and fire-resistance ratings needed for specific applications. Stating that only specific thicknesses are approved for residential use without acknowledging occupancy classifications fails to recognize the broader range of requirements for various building types. Finally, suggesting that installation can vary by region without consequence neglects the importance of following established codes that ensure uniform safety and performance standards across different areas.