Within what percent of the ceiling height must partitions extend to be considered separate rooms?

Within what percent of the ceiling height must partitions extend to be considered separate rooms?

• A. 10
• B. 15
• C. 20
• D. 25

Answer: (B)

The key idea is that to be counted as separate rooms, a partition must extend up close enough to the ceiling to form a continuous boundary. The standard uses a percent of the ceiling height to define “close enough.” Fifteen percent is the threshold used here, so the partition has to reach within about 1.2 feet of the ceiling in an eight-foot-high room—roughly 6 feet 10 inches tall. If the partition stops more than that distance short of the ceiling, the spaces are not considered separate rooms. The other percentages would alter how close the wall must come to the ceiling (10% would require a higher wall, 20% or 25% would allow a shorter one), but the tested criterion is 15 percent.

The key idea is that to be counted as separate rooms, a partition must extend up close enough to the ceiling to form a continuous boundary. The standard uses a percent of the ceiling height to define “close enough.” Fifteen percent is the threshold used here, so the partition has to reach within about 1.2 feet of the ceiling in an eight-foot-high room—roughly 6 feet 10 inches tall. If the partition stops more than that distance short of the ceiling, the spaces are not considered separate rooms. The other percentages would alter how close the wall must come to the ceiling (10% would require a higher wall, 20% or 25% would allow a shorter one), but the tested criterion is 15 percent.