Construction Supervisor License Practice Exam

What does Type X gypsum board designate?

1. Smoke proof gypsum

2. Fire-resistant gypsum

3. Water resistant gypsum

4. Exterior rated gypsum

The correct answer is: Fire-resistant gypsum

Type X gypsum board is specifically designated as fire-resistant gypsum. This type of board includes additives that enhance its ability to withstand heat, making it suitable for use in walls and ceilings where fire resistance is crucial. Building codes often require Type X gypsum board in areas such as stairwells, elevator shafts, and walls separating different occupancy types to help slow the spread of fire. The fire-resistance rating of Type X gypsum is typically achieved through a core that contains special materials, enabling it to withstand fire exposure longer than standard gypsum board. This attribute is particularly important in ensuring compliance with safety codes and providing additional time for building occupants to evacuate in the event of a fire. Other types of gypsum boards, such as moisture-resistant or exterior-rated boards, serve different purposes and are manufactured with varying specifications to address specific environmental conditions. These distinctions underline the importance of selecting the appropriate type of gypsum for the specific application within a construction project.