Riser Opening

The IRC does not require solid risers, but in a flight of stairs, any riser opening that is located more than 30 inches above the floor below must not allow the passage of a 4-inch-diameter (102mm) sphere (based on the 2021 IRC R311.7.5.1).
The IRC does not require solid risers, but in a flight of stairs, any riser opening that is located more than 30 inches above the floor below must not allow the passage of a 4-inch-diameter (102mm) sphere (based on the 2021 IRC R311.7.5.1).

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