Here’s a visual of what these handrails look like. Type I handrails layout the parameters for handrails having a perimeter dimension not greater than 6 ¼ inches while Type II handrails address handrail perimeters greater than 6 ¼ inches. It should provide proper graspability which the code recognizes a Type I and Type II handrail to have. When it comes to handrails the code is very specific on this. When are Stair Handrails Required?Įach flight of stairs having four or more risers must be provided with handrails on not less than one side per Section R311.7.8. All of which is found in Section R311.7.8 of the code. So if you are within those limitations, the design of your staircase will come down to what works best for the user given your space limitations.įun Tip: For Winder Tread dimensions, be sure to check out this post: Winder Stair Requirements | Explained! STAIR HANDRAILSĪs for handrails, there are several safety factors to go over such as knowing when they are required, height placement, and the clearance from a wall. However the code understands every scenario is different which is why it provides limitations. This is typically a standard design for stairs. If the risers are too tall or the treads are too deep, they can be a potential tripping hazard.įor a general rule of thumb, when it comes to residential stairs, the design industry will utilize the 7-11 rule which means 11 inch treads with 7 inch risers. It is important to note that the code establishes the minimum and maximum requirements to ensure a level of safety is provided. Illustration: 2021 © Building Code Trainer Therefore if a handrail is provided on one side, the clear width of the stairs shall not be less than 31 ½ inches and when handrails are provided on both sides, the clear width shall not be less than 27 inches. Now when handrails are introduced they shall not project more than 4 ½ inches on either side per Section R311.7.8.2. The minimum width for stairways shall not be less than 36 inches clear. Sectio n R311.7.1 outlines the minimum width of a residential stairway. Now let’s get into what those residential stair requirements are… MINIMUM STAIR WIDTH In this post however we will be looking at the code standards related to residential stairs in accordance with the International Residential Code (IRC).įun Tip: Looking for Commercial Stair Requirements? Be sure to check out this POST. In which case you will need to look to the International Building Code (IBC). The first important thing to note here is that if you are looking for commercial stair standards, they vary. Several components are looked at such as stair width, headroom, riser and tread heights. When it comes to residential stair standards, the 2021 International Residential Code (IRC) establishes minimum requirements for stairs to insure a level of safety to the public.
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