[ Ссылка ] Click on this link for more helpful videos about building codes, construction and stair building. This video will provide viewers with a new building code update they might not be aware of. Stair steps or treads might require a nosing if the step is less than 11 inches in depth where this wasn't a general requirement a few years ago.

Exception: A nosing projection is not required where the tread depth is not less than 11 inches.

This is from the 2021 International Residential Code book and the reference number is R311.7.5.3

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