NICET Level 1 NTC Red Book Practice Test

A ceiling shall be treated as smooth if the beams project no more than ____ inches below the ceiling?

4 inches 6 inches 12 inches 18 inches

Correct Answer:

4 inches

Explanation:

Smooth ceilings are surfaces that appear flat and continuous. When structural beams poke down below the finished ceiling, they create bumps that break that flat look. The standard is that the projection must be small enough to still read as a smooth plane. If beams project four inches or less, the ceiling can be treated as smooth. If a beam sticks down more than that, the surface is not considered smooth and typically needs additional treatment, like boxing or furring, to restore a flat, uninterrupted appearance.

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