California Residential Inspector Practice Exam

Is it correct that one-quarter inch gypsum board can be used as fireblocking material?

1. Correct

2. Incorrect

3. Only in certain situations

4. Depends on the installation

The correct answer is: Incorrect

Gypsum board is widely used in construction for its fire-resistant properties, however, there are specific requirements for it to serve as effective fireblocking material. Fireblocking is intended to impede the movement of flames and smoke through concealed spaces in residential and commercial buildings. In California's building codes, one-quarter inch gypsum board is generally considered insufficient for fireblocking. Fireblocking needs to be robust enough to withstand potential fire exposure and slow down the spread of fire throughout a structure. Typically, thicker material, such as 1/2 inch or greater gypsum board, is specified for these applications because it offers better insulation against heat and flames. This understanding of gypsum board's fireblocking requirements underscores the importance of adhering to local building codes and standards, which aim to protect occupants by slowing the progression of fire. Therefore, the assertion that one-quarter inch gypsum board can be used as fireblocking material does not align with these guidelines, making the provided answer accurate.