California Residential Inspector Practice Exam

What is the maximum area of a concealed space above combustible ceiling assemblies before draftstops are required?

1. 500 square feet

2. 750 square feet

3. 1000 square feet

4. 1200 square feet

The correct answer is: 1000 square feet

The requirement for draftstops in concealed spaces above combustible ceiling assemblies is crucial for controlling the spread of fire and smoke within buildings. In California's building code, the maximum area allowed for a concealed space without the need for draftstops is established to limit the potential for fire to spread undetected throughout larger areas. A concealed space is defined as an area that is hidden from direct view and is typically not accessible, making it particularly important to have restrictions in place to ensure safety in case of fire. If this space exceeds 1000 square feet, it becomes necessary to install draftstops to compartmentalize the area and slow the movement of smoke and flames. This helps in increasing the overall safety of the building occupants and simplifies firefighting efforts by creating smaller, manageable areas of concern. When considering areas that are less than 1000 square feet, the risk of extensive fire spread through these spaces is reduced, and the code reflects that by not requiring draftstops. Hence, knowing that the threshold for calling for draftstops is set at 1000 square feet reinforces the importance of fire safety measures in operations and inspections within residential buildings.