ICC Commercial Building Inspector Practice Test

What is the minimum horizontal separation distance between plastic skylights in a Group R-2 occupancy without fire sprinklers?

1. 2 feet

2. 4 feet

3. 6 feet

4. 8 feet

The correct answer is: 4 feet

The minimum horizontal separation distance between plastic skylights in a Group R-2 occupancy without fire sprinklers is mandated to be 4 feet. This requirement is based on fire safety regulations aimed at preventing the rapid spread of fire within buildings. In Group R-2 occupancies, which include multifamily residential buildings, the risk of fire spreading through openings such as skylights must be carefully managed. The 4-foot separation distance is established to ensure that if a fire occurs in one skylight, it does not easily spread to adjacent skylights, thereby enhancing the overall safety of the building. The specified distance takes into account the potential heat and flames associated with a fire, allowing room for firefighters to operate and reducing the risk of fire jumping from one area to another. This regulation is particularly crucial in buildings without fire sprinklers, as the absence of such systems increases reliance on passive fire protection measures, including maintaining appropriate separation between openings.