When is a nosing required on a stair tread?

Saturday, February 29, 2020

    A nosing (extension of the tread leading edge past face of riser below it) is required for stair treads less than 11 inches in depth to create a minimum tread surface of at least 11 inches (IRC 311.7.5.3). Since the minimum tread depth by code is 10 inches, any tread of 10 inches or more and less than 11 inches would need a nosing. The nosing cannot project less the 3/4 inch or more than 1-1/4 inch.

    Occasionally we come across an extremely steep stair with a nosing that exceeds the safe maximum of 1-1/4 inch, like in the photo below, which overhangs 2-1/2 inch.

    Also, see our blog post What is the steepest residential stair allowed?

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Here’s links to a collection of our other blog posts about STAIRS:

What do home inspectors check when inspecting stairs?

Is a landing always required at the top and bottom of stairs? 

When is a railing required at stairs?

What is the building code for the minimum height of stair steps (risers)? 

When is a nosing required on a stair tread?

What is the building code requirement for receptacle outlets at stairs and stair landings?  

Are open stair risers acceptable?

What is the steepest residential stair allowed?

Why is a single step dangerous in a house?

 Do I need stairs at all exit doors from a mobile home? 

The stairs feel too steep. What's the building code? 

• What is the longest stair run allowed? 

• What is the lighting requirement for stairs?

• A light is required over a stair after how many steps/risers? 

• When is safety glass required for windows at stairs and stair landings?

   Visit our STAIRS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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