Commercial Building Inspector B2Roof Ceiling ConstructionMedium
An inspector is evaluating a roof assembly with a new skylight installation on a commercial building. The skylight has a maximum dimension of 48 inches and is not designed as a walkable surface. According to IBC, what is the minimum height above the roof surface that a protective screen must extend around the skylight opening if the skylight is not protected by a curb or guardrail?
- A48 inches
- B42 inches
- C60 inches
- D36 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 42 inches
IBC 2405.3 requires skylights and other roof openings to be protected from falling by a guardrail, a curb at least 4 inches high, or a protective screen. If a screen is used and the skylight is not designed to be walked upon, the screen must extend a minimum of 42 inches above the roof surface.
Why the other options are wrong
- A. 48 inches is a greater height than required, offering more protection but not the minimum.
- C. 60 inches is excessively high and not the code minimum for this application.
- D. 36 inches is typically the minimum height for a guardrail in other applications, but not for skylight screens.
Skylight Protective Screen Height
The minimum height above the roof surface that a protective screen must extend around a non-walkable skylight opening, as specified by the IBC, to prevent falls.
- 42 inches minimum height.
- Applies to non-walkable skylights.
- Alternative to curb or guardrail.
Memory trick: Skylight screen, 42 inches seen, keeps workers safe and keen.