Stair dimensions in all three common codes, the OSHA codes for workplaces and the IBC and IBC-derived codes for residences and commercial buildings are complicated. When it comes to residential stair standards, the International Residential Code (IRC) establishes minimum requirements for stairs to insure a level of safety to the public. 3.4.6.8. Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the stairs. Earlier this year I built a dog step for My Helper and had to figure out maximum rise, and run dimensions when designing the stairs for her. (c) Rise and Run. Handrails . By visiting our site, you agree to our privacy policy regarding cookies, tracking statistics, etc. Therefore let us recap on the residential stair code requirements:eval(ez_write_tag([[300,250],'buildingcodetrainer_com-leader-1','ezslot_5',112,'0','0'])); For more information, see Section R311.7 of the 2015 International Residential Code for a more in-depth look at stair requirements. Minimum 6′-8″ headroom height clearance for stairway. The minimum width for stairways shall not be less than 36 inches clear. CODES CANADA . Minimum 10 inch stair tread depth with nosing or Minimum 11 inches with no nosing. (1) Codes Canada . You should measure riser heights vertically, between the leading edges of two consecutive steps. Be sure to check out this POST.eval(ez_write_tag([[300,250],'buildingcodetrainer_com-box-3','ezslot_4',106,'0','0'])); Looking for Commercial Stair Requirements? The greatest riser height within any flight of stairs must not exceed the smallest by more than three-eighths inch. The stair codes from the 2008 version of the California Building Code state that private stairways must be at least 36 inches wide. The run must not be less than nine inches. The rise must be between 4 and 8 inches, with a minimum run of 9 inches. This means the rise is 7 inches and the run is 11 inches. and the run: RUN: the horizontal distance of one stair. The rise must be between 4 and 8 inches, with a minimum run of 9 inches. Stairways shall not be less than 36 inches (914 mm) ... side of each continuous run of treads or flight with four or more risers. On any given flight of stairs, all steps shall have uniform riser heights and uniform tread widths. The general rule in the United States is a 7" rise and 11" tread depth. The rise of steps and stairs must not be less than four inches nor more than eight inches. Bottom line, check with your local building official before cutting those stringers or forming that stoop.). The stair codes from the 2008 version of the California Building Code state that private stairways must be at least 36 inches wide. We are no longer supporting IE (Internet Explorer), Parts of Your Home Prone to the Most Winter Weather Damage, An Expert Guide to Framing Basement Walls, Lumber Prices Finally Fell in October (But Are Still Way Too High), Do Not Sell My Personal Information – CA Residents. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway PHOTO 2 and the For residential stairs, the code specifies the minimum stair head height, stair width and landing dimensions, as well as the maximum size of risers, treads and handrails. Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height PHOTO 1. The general rule for standard stair dimensions that is accepted by many general contractors and stair designers is known as the "7-11" rule. Since the actual riser dimension will be restricted by the floor to floor height you should determine it first then select the run. (Title 24, Part 2, Section 3305 (b).) Ideal Stair Rise & Run Specifications Stair Building Calculations & Designs - what is a good starting point for laying an indoor or exterior stair: the best dimension for safe easy-to use stairs? To avoid having to install nosing the code requires the depth of the tread to be no less than 11 inches. If they are placed up against a wall they should have a clearance from the wall not less than 1-½ inches.eval(ez_write_tag([[580,400],'buildingcodetrainer_com-large-leaderboard-2','ezslot_3',111,'0','0'])); They must be continuous for the full length of the flight of stairs and shall begin at a point directly above the bottom riser to a point directly above the top riser. 4.9.1* Minimum Number. R311.5.1 Width. 9.8.4.7. Again the tolerance of treads or nosing should be no more than ⅜ inch. and A-9.8.4.) Having proper headroom is another important code requirement. STAIR RISE & RUN CALCULATIONS. After seeing the popularity of my post on Residential Stair Design, I thought it made sense to explain the guidelines from the 2006 International Building Code for commercial buildings and common stairs in buildings with more than two dwelling units.It is much more complex and there are some exceptions if you need them so please contact me if you need help. U:\Progress\Dana\POLICY\Stair Treads\International Building Code Stair treads and risers.doc 06/23/2014 International Building Code for Stair treads and risers 1009.3 Stair treads and risers. The International Residential Code (IRC) has specific instructions the way stairs can be built. Tread Nosings (See Notes A-9.8.4.8. Treads also may not have a slope greater than a 2 percent grade. Either B or C is required. Standard code requires that a stair run should fall between 9 inches and 11 inches (22.9cm and 27.9cm) to allow people to safely ascend and descend stairs. (a) Rise and run. When it comes to handrails the code is very specific on this. STAIR CODES & STANDARDS. These regulations recommend the stair rise to be no more than 7.75 inches (17.78 cm) and stair run to be no less than 10 inches (25.4 cm). R311.5.6.1 Height. 2010 National Model Construction Codes ― Stairs, Ramps, Handrails and Guards « The height limit established by code is intended to provide a reasonable interval for the user so that they may rest on a level surface and to alleviate the negative effects of long uninterrupted flights. Enter Total Stair Rise* inches : Enter Your Run: inches: We suggest 10.5" for 2x12 or 2 - 2x6 Treads. Thus it varies by state and town. Rise and Run. (1) The rise of every step in a stairway shall be not less than 4 inches nor greater than 7 1/2 inches. Treads and Risers. All of these measurements include the finished flooring, so don’t forget to take those thicknesses into account when planning your stair dimensions. The total run is the overall horizontal distance traveled by the stringer. R311.5.1 Width. The IRC code does not allow a distance greater than 7-¾ of an inch  from one step/tread to the next. So I thought I might as well make her steps to building code :). 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Note that when looking for commercial stair standards, one must look at the International Building Code (IBC). Or see the ARTICLE INDEX below for detailed articles on specifications for proper dimensions for stairs, railings, platforms. (1) The rise of every step in a stairway shall be not less than 4 inches nor greater than 7 1/2 inches. Part 9 – Housing and Small Buildings Division B:Acceptable Solutions Division B 3)Treads in winders shall have a run, measured at a point 200 mm from the narrow end of the tread, conforming to the minimum run requirements for a private stair in Table 9.8.4.2. SECTION R311.5 STAIRWAYS . The treads must have a run of at least 10 inches and cannot have a rise greater than 7 3/4 inches. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway PHOTO 2 and the minimum Dimensions of Landings . The code specifies that risers should not be more than 7 ¾ inches in height and that any variation of risers within a flight of stairs should not be more than ⅜ inch. Handrails & Guards/Guardrails: A handrail is a railing that runs up a stair incline for users to hold when ascending or descending a staircase. 2012 RESIDENTIAL STAIR GUIDE . Stair tread depths shall be 11 inches (279 mm) minimum. It is how far in, the stair goes which gives the amount of room for a persons foot. If the distance between floor levels exceed 147 inches, the flight of stairs would require a level landing somewhere in-between to break up the flight of stairs.eval(ez_write_tag([[300,250],'buildingcodetrainer_com-medrectangle-4','ezslot_6',108,'0','0'])); Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies. North Carolina does not have a uniform building code for all counties. Generally we solve the problem of low slope long run stairways by using all platforms - steps that are 36" in length or more in the direction of run of the stairs, or by using a combination of normally sized stair treads (say 11" deep treads with a 6" or 7" rise) along with intermediate stair platforms. This should be no more than 7 3/4 inches. But easy stair travel doesn’t happen by chance. (a) Rise and run. * Reference Source – 2015 International Residential Code – [Buy on Amazon]. Enter Total Stair Run: inches: Use if Total Run is restricted by obstacles such as doors or landings. The stair tread is the RUN plus the nosing. Many people commonly confuse a handrail from a guardrail and vice versa. Also the maximum nosing radius cannot exceed 9/16 of an inch. Following the code is important for the safety of the house's occupants because most home injuries occur on … The best riser for a 10" run is 7 1/2". Maximum 4-1/2 inch handrail projection into stairway width, on either side. 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