In this video

This step analyzes a stairway design where the individual steps lack a nosing (overhang), but the upper deck, to which the top step connects, has a 1-inch overhang. The presenter clarifies that, according to building codes, the tread measurement for the top step is taken from the farthest protruding section of the deck (including its 1-inch overhang) to the farthest projecting point of the step below. This means that despite the physical step being 11 inches deep, the code-compliant measurement becomes 10 inches for that top step. This creates an inconsistency with the other steps, which have a full 11-inch tread. The presenter notes that this specific scenario (deck having a nosing but steps not) is rare and that most building inspectors might not even catch this subtle discrepancy. He suggests a simple fix for this specific problem: remove the deck board, rip (cut) off the 1-inch overhang, and reinstall it to eliminate the nosing on the deck.