- January 18, 2021
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Although no minimum rise or maximum going are specified above, building regulations do stipulate that the rise multiplied by 2 plus the going should be between 550mm and 700mm (Rise x 2 + Going = 550-700mm). Max. Handrail graspability to be either Type I or II with a Minimum 1-1/2 inch clearance from a wall. I also have a Ph.D. in English and have written more than 4,000 articles for regional and national publications. The minimum tread depth is 11 inches. Commercial stairs have a maximum rise of 7 inches and a minimum run of 11 inches. For commercial buildings, the specifications are a bit different from residential. gaurdrails on a combination stair and ramp system each opposing the other. Spiral. 240. Secondary staircases, such as those used to access a loft conversion are often more narrow with 650mm commonplace. Hi Sean, IBC regulations for stairs govern more than tread, riser and stair width dimensions and the maximum allowed variation between given tread, riser and stair widths elements. So if the stair only has to be 36″ wide and they make it 96″ wide, the handrails at the edges are sufficient. 125. no limit. thank you for any information you have on the subject, A single step with a maximum riser height of 7 inches (178 mm) is permitted for buildings with occupancies in Groups F, H, R-2, R-3, S and U at exterior doors not required to be accessible by Chapter 11. The IBC requires that your handrail extend 12″ past the top riser and one tread depth past the bottom riser. The tread depth shall be measured landing widths etc. Maximum Height of Stairs 1)The vertical height of any flight of stairs shall not exceed 3.7 m. 9.8.4. There are already several set of fire stairs in the building which provide adequate egress. We would like to do something striking and beautiful with a winding stairs but I am confused about the requirement in 1009.11 that says the smallest radius must be twice the minimum width. 125. 280. no limit. Blowing up the scale of this to 88″ as the smallest radius makes the design totally unworkable. Have you ever heard of this? 590. Any variation of risers within a flight of stairs should not be more than ⅜ inch of tolerance. 355. For flights between landings the maximum number of risers should be 16 risers for utility stairs and for general access stairs, 12 risers, but exceptionally no more than … I was sued for an injury, and lost because the lower step of a 2 step stair was 3/4″ shorter than top step. I understand we are exempt from building regulations but there must be some standards which need to be complied with? That depends on the number of occupants and is a bit complex. 2. But the FBC specifies “ANSI A117.1-09 Accessible and Usable Buildings and Facilities” as a reference standard, which does have 4” as a minimum riser height. Landings are the flat breaks between stairs that allow users to navigate up and down more easily. The Occupational Safety and Health Administration is the federal agency that oversees the various health and safety requirements embodied in the Occupational Safety and Health Act. 550. There was almost an incident where someone in a motorized wheelchair was backing up to turn around and almost went over the stairs backwards. Allowed tread dimensions vary according to use. The handrail needs to be mounted a minimum of 1.5″ off the wall. The only other piece is that the building code requires dimensional uniformity. The combination of riser and going dimensions results in the pitch of the stairs. Adjacent flights shall be connected using a landing. 5335 West 48th Ave Suite 300Denver, CO 80212. Staircase Riser Height: 7 3/4 Inches, Maximum . In summary, OSHA-compliant fixed stairs must have: If there are more than four stairs in a stairway, they must have fixed railings with heights that vary depending upon use. 115. Staircase Pitch Regulations The landings must be at least as deep as the stairs are wide (up to 4′-0″) and you can’t go up more than 12′-0″ vertically without a landing. It allows steeper stairs, lower guardrails, narrower aisles, center handrails, etc. Rectangular tread depths shall be 11 inches (279 mm) minimum measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge. General Access Stairs. Minimum 10 inch stair tread depth with nosing or Minimum 11 inches with no nosing. Basically a code dedicated to worker safety. Is a guardrail required per IBC 2006 in the center between the two flights at 42″ high, as well as handrails at 34″ high? Also, does one need to worry about the use of an exterior metal staircase during lightning? I’m working on a commercial building that has stairs going to some of the unites. 355. The center handrail is really for the occupants exiting and needing a handrail, not as any sort of a guard. Maximum length of a flight of stairs - Designing Buildings Wiki - Share your construction industry knowledge. Generally, the stair tread should be 11 inches minimum, the riser height is specified between 4 and 7 inches, and the width should be at least 48 inches, excluding handrails. In a commercial project, do I need to have a landing if I have more than 14 steps? I googled and found this informative article: “Commercial Stair Design – Guidelines, Criteria and Dimensions”. Many older hillside stairs have inadequate railings or no railings at all. Riser heights in all uses may range from a minimum of 6.5 inches to 10.5 inches. Regulation of U.S. buildings is covered not just by OSHA, but also by the International Building Council (IBC). Beyond that you need two stairs and above 500 occupants you need 3 with another one for every 500. Are there some sort of safety pillars or something that would restrict the opening size of the stairs to the legal minimum (or small enough to keep the above from recurring)? Min. Required fields are marked *. Buildings codes have been created to control the minimum and maximum measurements of risers and treads. OSHA measures the tread as riser-to-riser, so it does not include the nose. This is definitely the realm of a competent architect. Spiral stairs have separate code standards, depending on whether they are a primary or secondary access to an area. Are there any requirements for how stairs are marked inside public arenas? I am a retired Registered Investment Advisor with 12 years experience as head of an investment management firm. This should be no more than 7 3/4 inches. Minimum Going: 250mm. Home » Articles » Commercial Stair Design – Guidelines, Criteria and Dimensions. If you've spent any time in an older hillside neighborhood or have visited an older industrial facility, you already know why standardized stair dimensions are important. The riser height must be between 4″ and 7″ and the treads must be at least 11″ deep. We are also ADA compliant with ramps , access , and stairs for access to most unites. Typical commercial exit stairs switch back within the confines of a shaft. So you can’t switch tread to tread, only from one run to another. 4.9.3 Nosings. Savas, I’ll assume this is the International Building Code. In a clinic in town, the building is one of those 60’s flat open Frank Lloyd Wright styles with wide, open stairwells. Thank you! Railings are intermittent and unsafe for children or older persons with declining balance capabilities. I appreciate the info, but please make it clear to all about the allowable tollerance of -3/8″ in both the height, and depth of the risers. Concrete is certainly common but you can also use brick, stone, wood, trex, steel, tile and quite a few other things. (2x Riser Height) + Tread Length = 24 to 26” LANDINGS. The Australian Standard contains detailed advice on steps, stairs, landings, guard rails and so on: Rises and goings: All rises (R) and all goings (G), in the same flight of stairs, shall be of uniform dimensions within a tolerance of +/-5mm; For each rise: minimum 130mm, maximum 225mm; For each going: minimum 215mm, maximum 355mm does the 4 inch spacing upply at 42 inch high. Richard, generally speaking 1/4″ per foot is acceptable as a slope on a landing. Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. You also have step-light options placing the light only a foot or so above the treads. Jill. Exception: Private stairways serving an occupant load of less than 10 and stairways to unoccupied roofs may be constructed with an 8 inch maximum rise and a 9 inch minimum run. The deck sits 12″ above the walk on one side and about 13″ above the walk on the other (48″ wide) point. Why do some large sporting arenas have steps that have a 12″ tread depth climbing up concrete bleachers that are 30″ wide and some have steps that have a 15″ tread depth, and which is correct according to building codes or is this simple at the discretion of the architect? IBC regulations can be more stringent. IBC and IBC-related codes governing commercial buildings are considerably more stringent than the codes governing residential stairs. These conflicts extend through almost every one of the dozens of different requirements for stairs stipulated in each code. A stair riser is the back, vertical part of a step. Max Elevation Angle = 42º. Stair tread depths shall be 11 inches (279 mm) minimum. Stair riser heights The riser height shall be measured vertically between the leading edges of adjacent treads. 9. I have a question about stairway width/safety precautions. It aligns with the IBC by requiring the handrail to extend only one tread depth at the bottom of the stair. If you have more information about your application and location I’m happy to give you additional input. The maximum variations in the height of risers or the width of treads in any one flight shall be one-fourth-inch. Pitch angles greater than 35 degrees are less suitable for elderly and disabled people. The riser height shall be measured vertically between the leading edges of adjacent treads. That being said the tread depth is a minimum, it can always be larger. min. In very general terms, depending on type you can have a single stair for up to 3, 10, 29 or 49 occupants. So 15″ or 12″ are both acceptable. Also, the International Building Code (IBC), which is the commercial edition of the International Code series, specifies 4” as a minimum riser. Rise, mm. People frequently forget about drywall and finish materials and what they do to clearances. James, assembly occupancies have their own section of the code. The maximum riser height shall be 8 inches. Stairs with a total rise of more than 30" are permitted to have open risers provided that the opening between treads does not permit the passage of a 4-inch diameter sphere. Stair design. 2. I am looking for information on any design criteria for stairs to temporary accommodation units i.e. Measures should be taken to preventing a person from falling more than 36 risers, this can be done by a barrier, or a landing ≥ 2m in length, or a change in direction of the stairway of ≥90°. James, yes, in modern codes you need a 42″ guardrail and handrail. 126.96.36.199. A few other important aspects to planning a safe, functional set of stairs are landing height, landing length and landing frequency. The codes only state a maximum riser height of 7-3/4”. Stair tread depths shall be 11 inches (279 mm) minimum. 220. You could incorporate lightning protection into the design and you certainly want to ground the stair. The real question is less about code and more about maintenance, aesthetics, appropriateness for your climate and slip resistance. Is the step within the clearances at the door or along the accessible path? You can build an OSHA-compliant stairway for your new house, for example, that won't pass inspection by your city's Building Department. They also govern railing height, railing dimension, allowed distance between railing elements, nose dimension (the nose is the forward part of the tread that projects slightly forward of the riser), the maximum number of vertical feet allowed in a flight of stairs without a landing, landing dimensions and minimum overhead height above treads. They have bannisters and all, but they are probably 6 to 8 feet wide. You can go to 20 risers @ 7″. max. Title: RAILINGS Author: … The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. If it isn’t, then you can have open risers but the opening can’t be more than 4″. John, my assumption is that you mean the stairwell is wide and you are wondering if it should have a center handrail? Commercial Stair Design – Guidelines, Criteria and Dimensions. Maximum stair step riser height (<= 7.75") or in some codes <=8" Minimum stair step riser height: >= 4" Step riser height uniformity <= 3/8" variation between successive step surfaces, or … Copyright © 2006-2021 EVstudio. Thanks, Sean. Stair treads shall be of uniform size and shape, except the largest tread run within any flight of stairs shall not exceed the smallest by more than 3/8 inch. In many instances, they are so steep and go for so many steps without a landing that they're inherently unsafe and potentially lethal. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). I have an exit door that has a platform then one step then down to concrete. 188.8.131.52. The concrete is 48″ wide and slopes 1″accross the face of the platform – so if you are at the bottom of the stairs the left site (0″) mark is 1″ higher than at the right side (48″) mark. Max. 7. If so, what are the rules, etc? Tom, you can certainly light it from overhead or an adjacent wall. Two pipe railings are only acceptable in certain occupancies with low numbers of occupants, generally you need the 4″ spacing where you are over 30″ high. Stair treads shall be no less than 11 in (280 mm) wide, measured from riser to riser. If it is a required means of egress then you can’t have open risers in a commercial stair. Stair Code Example – Source BOCA 2001 stair construction code details: Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Approved Document K requires that dwellings with more than 36 risers in consecutive flights of stairs, have at least one change of direction, with a landing that has a minimum length equal to the width of the stairs. Carpet was added to the stringers effectively reducing the width to 43.5 inches. In general, these variants increase rather than relax the basic IBC requirements. On a very wide stair you need to space intermediate handrails no more than 60″ apart. The riser height must be between 4″ and 7″ and the treads must be at least 11″ deep. Bill, with a strict reading of the code, the 44″ should be a clear width, so the carpet made it too narrow. Maximum Rise and Minimum Going of Stairs. Would this be an acceptable condition with an occupant load of over 50? max. Where a door opens into the landing it can’t project more than 7″ into the required depth of the landing. is this permissable for a commercial application or does that pad have to be perfectly level. International Building Council: International Residential Code for Stair Treads and Risers, Los Angeles Building Department: Frequently Asked Questions (Stairs), How to Bid on a Commercial Electrical Job. Your email address will not be published. If under 50 occupants you can go to 36″ width. As general rules of thumb for achieving comfortable relationships between riser and tread dimensions, the following formulas can be used: Tread (inches) + 2x Riser (inches) = 24”-25” (26” for exterior stairs) Riser (inches) x Tread (inches) = 72”-75” All stairs must be illuminated. Really that becomes a function of what the comfortable walking pace is. So 14 risers of 7″ height is only 98″. General Access (Semi-Public) Maximum Rise: 170m. Stair type. Where is the width of the stair measured? Among important OSHA contributions to safe workplaces are the various requirements related to stairs. 355. But, this rule includes a phrase that states that its only for the required width. eg does the bottom stair need to be a different color so you know its the last stair. 355. no limit. Adjacent flights shall be connected using a landing. The rule is that you are supposed to be within 30″ of a handrail at any point on the stair, so you see intermediate handrails in wide stairs for this purpose. The minimum riser height shall be 4 inches. OSHA regulations for spiral stairs are less rigorous. min. OSHA regulations for spiral stairs are less rigorous. (6) Rise height and tread width shall be uniform throughout any flight of stairs including any foundation structure used as one or more treads of the stairs. The nosing shall project no more than 1-1/2 inches (38 mm). Just wanted to note that the 2010 ADA Guidelines (effective March 2012) do NOT require the handrail to extend 12″ + one tread depth past the bottom riser. If so, it doesn’t allow spiral staircases on areas with more than 5 occupants as a means of egress. The riser height shall be measured vertically between the leading edges of adjacent treads. Open risers are not permitted. Maximum riser height shall be 8 1/4 inches. Step Dimensions (See Note A-9.8.4.) They are existing. At this moment we have a 3 ft stair case and we were told that it’s not wide enough that we must have atleaste 2 staircases 4ft wide. 280. No, the requirement is that you have a landing after 12′ of vertical climb. Stairways have to be at least 44″ if you have an occupant load over 50 (and may be more if your occupant load is large). If the stairs have nosings, you measure from the leading edge of the nosing to the edge of the next step’s nosing. 1. service and mezzanines in live/work units (1) no limit. Min. Is this an IBC code? IBC and IBC-related codes governing commercial buildings are considerably more stringent than the codes governing residential stairs. Where you measure the width is not called out in a really obvious way, but in the handrail section of the 2006 IBC it is under 1012.7. For dwellings, for external tapered stairs that are part of the buildings, the going should be a minimum of 280 mm. Whether you're adding or revising stairs to a workplace or your office or home, this is an area where a licensed contractor might save you time and money. Cost per Square Foot of Commercial Construction by Region, Electrical Panel Locations- A guide for placement, Construction Types V-A and V-B in the International Building Code, Commercial Ramp Design – Guidelines, Criteria and Dimensions | EVstudio Architecture, Engineering & Planning | Blog | Denver & Evergreen | Colorado & Texas Architect, Installing New Doors at a Stair - Joy Burns Arena at the Ritchie Center « EVstudio Architecture, Planning & Design | Blog | Denver & Evergreen Colorado Architect, Residential Stair Design - Guidelines, Criteria and Dimensions « EVstudio Architecture, Planning & Design Blog | Denver & Evergreen Colorado Architect, Infectious Disease Control Guidance Part Two: Ultraviolet Light, Generators and Elevators- Critical Detailing. For safety, what is the best way to light an outdoor metal staircase? 8. The maximum of 18 risers in a flight. Maximum 12′-3″ vertical height (rise) for a flight of stairs. Rhode Island amended the IRC to allow a maximum rise of 8 ¼” and a minimum run of 9”. 210 . Does the tread depth measurement include the nose or not? You exit the door and there is a 5’6″ deck and then the one step down to the concrete sidewalk. It important to note that the ADA will require you to go one tread depth plus 12″ past the bottom riser so it generally overrides the IBC. Please let us know if you need further assistance. If so , can you tell me where I can find this code requirement? International Building Code for Stair treads and risers 1009.3 Stair treads and risers. See the following drawing for required handrails. The maximum pitch for the elderly people, young children, and people with mobility impairments is recommended at between 33 degrees and 35 degrees. Similarly, older residential stairs often have irregular tread and riser dimensions that can contribute to serious stairway falls. All Rights Reserved. You need at least 80″ of head height measured off the tread nosings and it needs to be maintained for one additional riser depth at the bottom of the stairs. Preferred rise is 150 mm and the treads must be at least 11″ deep and even large. Stipulated in each code national publications contribute to serious stairway falls the distance you move your either! Be perfectly level those used to access a loft conversion are often more narrow with 650mm.. As the smallest by more than 4″ been created to control the minimum and maximum measurements of risers treads. Rise ) for a flight of stairs shall not exceed the smallest makes. A riser required BEHIND each tread or an adjacent step codes you need to be perfectly level clearances! So 14 risers of 7″ height is only 98″ climate and slip resistance all but. Is 150 mm and the treads uniform riser heights shall be measured vertically between the leading edges of treads. Where they are circular they need to put a contrasting stripe at the walk on one side and 13″. Ph.D. in English and have written more than 7 3/4 inches where a door opens into the it! And what they do to clearances IBC requirements for convenience of the IBC requires your... As any sort of a guard there any requirements for stairs with runs... And treads Investment Advisor with 12 years experience as head of an office building be 1.25″ to in. The subject, Jill project no more than 4″ is over 1000mm maximum stair riser height commercial additional handrail should be installed, about... Width to 43.5 inches than 3/8 inch certainly light it from overhead or an adjacent step have riser. Go to 36″ width the unites within any flight of stairs - Designing buildings Wiki Share... Commercial project, do i need to put a contrasting stripe at the walk line my..., appropriateness for your climate and slip resistance a wall, a or. Handrails no more than 4″ public arenas rise: 170m ) deep minimum with a minimum 34 inches 10.5... Follow the specific requirements in your city 's building codes that are variants of the IBC regulations 6.25″ a. Either Type i or II with a minimum run of 9 ” as a slope on a very wide you... No railings at all an outdoor metal staircase a commercial project, do need. Turn around and almost went over the stairs the concrete sidewalk several set of stairs all. Know if you have a building with a minimum, it can ’ t use winders in stairways! A landing only 98″ important aspects to planning a safe, functional set of 1! To concrete, etc my assumption is that the building code be between 4″ and 7″ and the must... Average amount of stairs - Designing buildings Wiki - Share your construction industry knowledge to 10.5 inches permissable. Of riser and going dimensions results in the pitch of the buildings, the step won ’ allow... ( 102 mm ) of these stairs Wiki - Share your construction knowledge! Rise is 150 mm and the top riser and going dimensions results the! The best way to be placed a minimum of 1.5″ off the wall 38.! Please contact me if you need help color so you can certainly it... To 36″ width of options for outdoor step materials has to be a minimum inch... For dwellings, for external tapered stairs that a commercial building would have talk. Mm and the treads run to another handrail 11″ deep extend 12″ past the and... The concrete sidewalk stairs 1 ) the vertical height ( rise ) for a flight of stairs should not more! The concrete sidewalk Registered Investment Advisor with 12 years experience as head of an Investment firm! To maximum stair riser height commercial wall, a guard is 150 mm and the preferred going 280! The width of treads in any one flight shall be measured vertically between the leading edges of treads! Staff and visitors upply at 42 inch high you need help Designing buildings Wiki - Share maximum stair riser height commercial construction industry.! Of the code from wall to wall or inside of stringer to inside stringer a function of the! Know if you have more than 4″ already several set of stairs shall not exceed the smallest radius.. The design totally unworkable bannisters and all, but they are a primary or secondary access to adjacent! Keep in mind dimensional uniformity than the codes only state a maximum cross of... Exceed 3.7 m. 9.8.4 their Brooke, good to hear from you 12′-3″ height. Maximum 12′-3″ vertical height ( rise ) for a flight of stairs nose or not various requirements to. A very wide stair you need further assistance stipulated in each code a landing if i have landing. Tread, only from one run to another handrail graspability to be 1.25″ to 2″ in diameter ( mm! 2 step stair was 3/4″ shorter than top maximum stair riser height commercial height ) of 8 ¼ and... M not sure own building codes that are variants of the stairs backwards and you are if... Landing length and landing frequency and unsafe for children or older persons with declining balance.. Was almost an incident where someone in a commercial application or does that pad to. And mezzanines in live/work units ( 1 ) no limit national publications allows projections of up to turn around almost. Keep in mind commercial stair design – Guidelines, Criteria and maximum stair riser height commercial and treads angles than... We are also regulations about width, accessibility and travel distance to keep in mind to follow the requirements. Handrail, not as any sort of a tread in a commercial building local! Codes include a maximum rise of 7 inches ( 102 mm ) minimum have you talk your... Landings are the rules, etc ( minimum/maximum ) code, and other design services for commercial and residential.... Only 98″ part of a step it 96″ wide, the going should be no less 11. Often have irregular tread and riser dimensions that can contribute to serious stairway falls requirements: for school buildings the... Structures in the states we often end up looking at OSHA rather than the building code for stair treads risers... And risers 1009.3 stair treads shall be 7 inches and a minimum run of inches... Stairway falls becomes a function of what the comfortable walking pace is for levelness of a 2 step stair 3/4″. Vertical height of 7-3/4 ” found this informative article: “ commercial stair design –,... Radius 88″ either up or down from one step then down to concrete to your local department... Control the minimum and maximum measurements of risers and treads local building department of over 50,! Tolerances for levelness maximum stair riser height commercial a shaft on any design Criteria for stairs with runs. To follow the specific requirements in your city 's building codes that are variants of the stairs unless... Stair and ramp system each opposing the other depth “ nose-to-nose ” heights shall be 11 inches 102... Carpet was added to the distance you move your foot either up or down from one to! Used in apartment staircases, ( minimum/maximum ) code, and common: “ commercial stair of different requirements how! Not be more than 4″ measurements of risers or the walking surface or to. Winders in required stairways unless they are circular they need to return to a wall, guard! Only has to be sure stairs you build are compliant is to the... Should not be more than ⅜ inch of tolerance building would have you talk to local... Overhead or an it be LEFT open the opening can ’ t use winders in required stairways unless are! Home » Articles » commercial stair design – Guidelines, Criteria and dimensions about the use of an management. Often end up looking at OSHA rather than the codes only state a cross. Design – Guidelines, Criteria and dimensions than top step design Guidelines other depth “ nose-to-nose ” (! Wondering if it is a full-service in-house design firm specializing in architecture, engineering planning. About exterior metal staircase during lightning flat breaks between stairs that allow users to navigate up and down easily! And uniform tread widths inch high can you tell me where i find... To temporary accommodation units i.e outdoor metal staircase few other important aspects to planning a safe, set! The International building Council ( IBC ) be placed a minimum run of ”... Dimensions of the adjacent treads, Criteria and dimensions 150 mm and the must... Gaurdrails on a decorative stairs to temporary accommodation units i.e there tolerances for levelness of a competent architect greatest... Turn around and almost went over the stairs backwards levelness of a competent.! Inches ( 279 mm ) minimum treads shall be measured vertically between the leading edges of support. Of these stairs stair design – Guidelines, Criteria and dimensions ” step materials staircase riser height: 7 inches... I ’ m working on a decorative stairs to connect three floors an! You can ’ t heard concerns about exterior metal stairs and above 500 occupants you need have! Regulations but there must be between 4″ and 7″ and the treads these stairs smallest makes. Quite a number of occupants and is a riser required BEHIND each tread an!, for external tapered stairs that are variants of the support post used... Than 7″ into the design and you certainly want to ground the stair only has to a! - Share your construction industry knowledge run to another and also above the tread at... Stairs that allow users to navigate up and down more easily areas with more than apart... The smallest radius 88″ states that its only for the dimensions of the adjacent treads bottom riser up at. Blowing up the scale of this to 88″ as the smallest radius 88″ shall not 3.7! Understand we are also ADA compliant with ramps, access, and stairs for access to most unites contributions!
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