Stair Width. Slip resistant nosings can be added to meet these standards. You can’t use winders in required stairways unless they are within a dwelling unit. Stairways have to be at least 44″ (1118mm) if occupant load is over 50 and 36″ (914mm) width if under 50 occupants you can go to. To overcome this you can simply add an extra handrail, newel and spindles to divide the staircase. contact@commercial … International Building Code Guidelines overview for commercial buildings and common stairs in buildings.It is much more complex, but these are the general rules. For commercial buildings, the specifications are a bit different from residential. Our code compliant staircases are safe and ready for regular foot traffic. Does the tread depth measurement include the nose or not? Calculating tread width of commercial stairways. For buildings other than dwellings. In this post we will be looking at the code standards related to residential stairs in accordance with the International Residential Code (IRC). Where a door opens into the landing it can’t project more than 7″ into the required depth of the landing. Generally used in commercial buildings, auditorium, the complex where there is high mobility. Australian Standard 1657 – 4.1 – Angle And Width Of A Stair’s Slope. is this permissable for a commercial application or does that pad have to be perfectly level. 3DM, OBJ, SKP formats, Dimensions is a project by Fantastic Offense. Stairs with winders need to be at least 11″ deep and when 12″ in from the narrow edge and the minimum depth must be 10″. "Stair width." Your email address will not be published. Have you ever heard of this? 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. Thank you! I have a building with a stairway width of 44 inches. Home » Articles » Commercial Stair Design – Guidelines, Criteria and Dimensions. Scaled 2D drawings and 3D models available for download. I was looking for the dimensions of the support post largely used in apartment staircases, (minimum/maximum) code,and common. – From wall to wall or inside of stringer to inside stringer? If so , can you tell me where I can find this code requirement? Fully sprinkled 5-story wood frame hotel with occupant load of 82 persons per floor split between (2) interior stairs. There are no restrictions when it comes to width, but standard flights measure 860mm, and for a main staircase it is agreed that a width of between 800mm and 900mm works best. In buildings, a flight of stairs refers to a complete series of steps that connects between two distinct floors. The industry standard for stair widths is 860mm but it’s not uncommon to see stairs between 800mm-900mm. Keep in mind, the minimum clear width is typically 44″, but … Commercial Staircase Design. or is a two pipe horizontal railing ok? Minimum headroom is typically 2000 mm, this may need to be increased if helmets are worn. Staircase width: Width refers to the length of risers and treads from side to side. What kind of material besides concrete is acceptable by code for outdoor stairs? 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. Stairwell width and stair landing platform requirements are summarized by this sketch. Treads must be solid if the stairway is more than 10 metres high or connects more than 3 stories. Subscribed! 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. Landings should be at least the width and length of the minimum width of the fight. You can go to 20 risers @ 7″. not of mesh or perforated metal) If the stair is an open stair, the riser openings must be less than 125mm International Building Code Guidelines overview for commercial buildings and common stairs in buildings.It is much more complex, but these are the general rules. But there are also regulations about width, accessibility and travel distance to keep in mind. They are existing. Width of flights of stairs. A confirmation email has been sent. The edge of treads should be visible against the background. Headroom: Headroom is the vertical dimension from the stair … Is this an IBC code? In general public spaces a minimum of 44” (112 cm) must be met—providing ample space for one person and allowing the tight passage of two people. I haven’t heard concerns about exterior metal stairs and lightning but if it is a prominent feature it could happen. So paragraph 1.14 refers us to Part B, and under Part B Means of Escape from Flats, Width of common stairs, it says: 2.33 A stair of acceptable width for everyday use will be suf cient for escape purposes, but if it is also a fire-fighting stair, it should be at least 1100mm wide (see … Paragon Stairs provides commercial staircases that fit your business’ needs. We are also ADA compliant with ramps , access , and stairs for access to most unites. But, this rule includes a phrase that states that its only for the required width. 1.14 For stairs that form part of means of escape, refer also to Approved Document B: Fire safety, Volume 2 – Buildings other than dwellinghouses. Required fields are marked *. Commercial Stair Design – Guidelines, Criteria and Dimensions. 1910.24(e) "Angle of stairway rise." Updated daily. If so, the step won’t work. In a commercial project, do I need to have a landing if I have more than 14 steps? There are other exceptions for spiral stairs, aisle stairs and incline stairs but these types will have to be covered in a later post. This stair will be purely an aesthetic feature and for convenience of the staff and visitors. The Ontario Building Code | Stair Width 9.8.2.1. Approved Document M Vol1 (England) refers to a “general access stair” for common areas in flats where a lift is not provided, and a “utility stair” where a lift is available. Note that when looking for commercial stair standards, one must look at the International Building Code (IBC). Fig.7: Width of landing determined based on the stairway they serve The dimension of landing in the direction of travelling should be at least equal to the width of the stair and it should not surpass 1219mm where the stairway is a straight run. Regarding the width and angle of the slope, stairways shall not be less than 600 mm wide measured between the edges of the safety handrails. I’m working on a decorative stairs to connect three floors of an office building. Fixed stairs shall be installed at angles to the horizontal of between 30 deg. Be sure to check out this POST. If it isn’t, then you can have open risers but the opening can’t be more than 4″. 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. In those instances ensure that stairs within the entrance storey of a dwelling have flights with a minimum stair width of 900mm. Stair treads. 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. Exception #2: Clear width of 48” not required in building sprinkled throughout. I’m working on a commercial building that has stairs going to some of the unites. That being said the tread depth is a minimum, it can always be larger. Comfortable two person stair widths range between 49” (125 cm) to 60” (152 cm). 1011.5.2/R311.7.5.1 Riser Height and tread Depth Stairs shall have a maximum rise of 7 inches and a minimum run of 11 inches. James, assembly occupancies have their own section of the code. Concrete is certainly common but you can also use brick, stone, wood, trex, steel, tile and quite a few other things. 270 mm from each side of the unobstructed width of the stairway if the stairway is 1 m wide or more. Stairways have to be at least 44″ (1118mm) if occupant load is over 50 and 36″ (914mm) width if under 50 occupants you can go to. In very general terms, depending on type you can have a single stair for up to 3, 10, 29 or 49 occupants. In a clinic in town, the building is one of those 60’s flat open Frank Lloyd Wright styles with wide, open stairwells. Gary, I see you’re in the UK and honestly I’m not sure. Your handrails need to be on both sides of the stair and can’t project more than 4.5″ into the stair width on each side. We thrive on delivering our customers expectations and take time to understand your business staircase installation needs and logistics. We thrive on delivering our customers expectations and take time to understand your business staircase installation needs and logistics. Thanks for the info. I would have you talk to your local building department. The riser height shall be measured vertically between the nosing’s of adjacent treads. So you can’t switch tread to tread, only from one run to another. Is a guardrail required per IBC 2006 in the center between the two flights at 42″ high, as well as handrails at 34″ high? Now let’s get into what those residential stair requirements are… STAIR WIDTH. Beyond that you need two stairs and above 500 occupants you need 3 with another one for every 500. Looking for Commercial Stair Requirements? The minimum width for stairways shall not be less than 36 inches clear. Where it is necessary to have a stepped change of level within the entrance storey, this should be a minimum width of 900 mm. Premier Guarantee. 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. In order to determine this the code refers us to Section 1005.1, but before we look at this section the code does say that the minimum width shall not be less than 44 inches. I googled and found this informative article: “Commercial Stair Design – Guidelines, Criteria and Dimensions”. The minimum width of stairs for the different types of buildings is shown in the table above. Select an item from the list on the right to compare related dimensions. Accordingly, in normal circumstances, the acceptable stair width for apartment blocks would be as shown in Figure 2. ErectaStep commercial stairs with winders will be custom orders. Handrails in IBC buildings need to return to a wall, a guard or the walking surface or continue to another handrail. ©2020 Dimensions.com | All rights reserved. www.premierguarantee.com. John, my assumption is that you mean the stairwell is wide and you are wondering if it should have a center handrail? Continuous stairs: Stair with continuous steps or winders. Hi Sean, In the case of escape routes and stairs, handrails and strings which do not intrude more than 100 mm into these widths may be ignored (see Diagram C1). For stair landing; the width of the landing shall not be less than the stairway width and a minimum of 600 mm clear of cross-traffic, door swing or any other structure. Summary: calculate the total width per floor you need by multiplying the occupant load by 0.3″ and in some cases 0.2″. For stairs enclosed by a wall on both sides, usually the stairway width is the distance between those walls. Want updates on new Dimensions content? There are other exceptions for spiral stairs, aisle stairs and incline stairs but these types will have to be covered in a later post. The depth of the tread must be at least 11 inches. No, the requirement is that you have a landing after 12′ of vertical climb. Stair landings a required for 12′ vertical stairs inclines and must be at least as deep as the stairs are wide (up to 4′-0″). OSHA measures the tread as riser-to-riser, so it does not include the nose. There are quite a number of options for outdoor step materials. Stair details refer to the standard requirements for each of the various components of a flight of stairs. For secondary staircases a minimum width of 600mm is recommended. Twitter: @PG_Live Please note: this is a commercial profile. Stair Width. 2)Exit stairs serving a single dwelling unit shall have a width of not less than 860 mm. stairs and handrails in commercial and multi-family construction. Dec 3, 2020 - Foshan Demax Architectural Products Co,Ltd design and build custom commercial staircases,commercial stairs for indoor and outdoor. Are there any requirements for how stairs are marked inside public arenas? Section 1009.3 Accessible egress stair minimum 48” between rails. Handrails must be mounted between 34″ and 38″ above the tread nosings and landings. A stair is the clear width between the walls or balustrades. Most commercial buildings will also require the ramp design guidelines. Basically a code dedicated to worker safety. The width allows for a wheelchair user to be safely carried down in the event of an emergency. Stair tread depths shall be 11 inches (279 mm) minimum. 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. However, the calculation can take into account handrails, which can encroach on either side by a maximum of 4.5 inches. Tread depth is the full depth of the tread, we call the other depth “nose-to-nose”. The center handrail is really for the occupants exiting and needing a handrail, not as any sort of a guard. My question is do I need to put a contrasting stripe at the bottom and the top of these stairs ? Stair widths are based on the use and occupancy loads of adjacent spaces and must be serviced with handrails on one or both sides depending on the stair width.Consult the building code for details on specific occupancy loads. That allows projections of up to 4.5″ at or below the handrail height and also above the headroom requirement. For three simultaneous users, a minimum of 74” (188 cm) is recommended. Several components are looked at such as stair width, headroom, riser and tread heights. Where is the width of the stair measured? eg does the bottom stair need to be a different color so you know its the last stair. For code requirements, the minimum staircase width is the horizontal dimension between the sidewalls of a staircase, measured above the handrail(s). As a specialist staircase fabricator, we are used to supplying bespoke Steel Staircases, Retail Staircases, Industrial Staircases, Commercial Staircases, Fire Escape Staircases and associated products. 1910.24(e) "Angle of stairway rise." So 15″ or 12″ are both acceptable. OSHA requires railings on open sides of stairwells and a handrail on at least on the side, preferably the right side descending at 42″ high. EVstudio is a full-service in-house design firm specializing in architecture, engineering, planning, and other design services for commercial and residential projects. Maximum Width of Staircase : The maximum width of a public staircase is 2000mm (measured between inside faces of handrails). and 50 deg. In the case of escape routes and stairs, handrails and strings which do not intrude more than 100 mm into these widths may be ignored (see Diagram C1). Typical commercial exit stairs switch back within the confines of a shaft. These are the general rules. Commercial Staircase Design. The minimum recommended stair landing length is 36" (or a length and width sufficiently greater than the swing of the door if … Notify me of follow-up comments by email. Surprisingly, there is no minimum width for a staircase although it should be practical and safe for a person to use. Bifurcated stairs: The single width span stair bifurcated at the top of the landings. Surprisingly, there is no minimum width for a staircase although it should be practical and safe for a person to use. "Stair width." Stair Width 1)Except as provided in Sentence (2), required exit stairs and public stairs serving buildings of residential occupancy shall have a width of not less than 900 mm. I could have 11″ of run at the walk line if my minimum radius is about 4’3″. The minimum recommended stair width is between 34" and 36" ACROSS. However, the calculation can take into account handrails, which can encroach on either side by a maximum of 4.5 inches. Stairways have to be at least 44″ (1118mm) if occupant load is over 50 and 36″ (914mm) width if under 50 occupants you can go to. The height and depth of stair treads must be consistent throughout each flight of stairs; If the stair is higher than 10m or three storeys, the treads must be solid (ie. The only other piece is that the building code requires dimensional uniformity. Fixed stairways shall have a minimum width of 22 inches. Minimum Staircase Width & Length. The industry standard for stair widths is 860mm but it’s not uncommon to see stairs between 800mm-900mm. For stairs serving a single user (typically private residential), a minimum of 36” (91 cm) is required. Keep in mind, the minimum clear width is typically 44″, but … If it is a required means of egress then you can’t have open risers in a commercial stair. Width is calculated as clear, net, usable, unobstructed space. Exception #2: Clear width of 48” not required in building sprinkled throughout. Every landing shall have a minimum dimension measured in the direction of travel equal to the width of the stairway. Our in-house engineers work with your consultative designer to create the right staircase solution for your business. 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. Assuming the minimum width of 36 inches, the floor space used by these stairs is 57.75 square feet. You exit the door and there is a 5’6″ deck and then the one step down to the concrete sidewalk. People frequently forget about drywall and finish materials and what they do to clearances. The riser height must be between 4″ and 7″ and the treads must be at least 11″ deep. 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. The minimum stair width must satisfy Building Regulations B (or BS9991), M and K, all at the same time. I understand we are exempt from building regulations but there must be some standards which need to be complied with? www.southernstaircase.com 800.874.8408 Curved Stairs Straight Stairs Spiral Stairs Stair Parts & Accessories ... *Note: The width and/or height of this rail exceeds most building codes. 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? The deck sits 12″ above the walk on one side and about 13″ above the walk on the other (48″ wide) point. 5335 West 48th Ave Suite 300Denver, CO 80212. James, yes, in modern codes you need a 42″ guardrail and handrail. Length of Staircase It allows steeper stairs, lower guardrails, narrower aisles, center handrails, etc. A stair is the clear width between the walls or balustrades. Tel: 0800 107 8446. info@premierguarantee.co.uk. IS A RISER REQUIRED BEHIND EACH TREAD OR AN IT BE LEFT OPEN. It is much more complex and there are some exceptions if you need them so please contact me if you need help. For code requirements, the minimum staircase width is the horizontal dimension between the sidewalls of a staircase, measured above the handrail(s). The Staircases Building Regulations cover the design of a staircase and is covered by BS5395: Part 1, BS5395 Part 3, & BS 5960 Part 5 and others British Standards. If under 50 occupants you can go to 36″ width. 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. Some codes such as CA/OSHA specify a minimum stairway width of 24" [35].. Twitter: @PG_Live Please note: this is a commercial profile. Please let us know if you need further assistance. Bill, with a strict reading of the code, the 44″ should be a clear width, so the carpet made it too narrow. Stairways shall have handrails on each side and shall comply with Section 1014. in comercial does the handrail have to project past the last tread or can it be returned straight down to the top of the stringer ? If so, what are the rules, etc? Calculating tread width of commercial stairways. www.southernstaircase.com 800.874.8408 Curved Stairs Straight Stairs Spiral Stairs Stair Parts & Accessories ... *Note: The width and/or height of this rail exceeds most building codes. They have no breakage. Take the largest width that you calculate, and use it for the entire stairway system. commercial stairs width in houston texas - Chapter 5: Stairways - United States Access Board Escalators must have a clear width of at least 32” and meet specific provisions in the ASME A17.1 Safety Code for Elevators and Escalators. If the stair width is more than the minimum specified width, handrails are to installed in the stairs. I think you’ll need to look at turning some of the risers to make the distances work or working through the width with the building department. Unlike residential stairs per the IRC, where the width is just a given measurement, commercial stair width per the IBC is based on capacity. If under 50 occupants you can go to 36″ width. Stair widths are based on the use and occupancy loads of adjacent spaces and must be serviced with handrails on one or both sides depending on the stair width. I believe my minimum width is 44″, making the smallest radius 88″. Yes, you’re right on their Brooke, good to hear from you. Stair Width (1) Except as provided in Sentence (2), required exit stairs and public stairs serving buildings of residential occupancy shall have a width, measured between wall faces or guards, of not less than 900 mm. Not many restaurants will have an occupancy of less than 50, meaning the minimum width would be 44 inches. thank you for any information you have on the subject, The rails used for guiding a stair-lift may be ignored when considering the width of a stair. So as long as your stringer is projecting less than the handrail and neither over 4.5″, then you can use the width measured above the handrail height. A minimum 44″ wide in most cases (36″ wide areas served by less than 50 people) Railings & Guardrail. See more ideas about commercial stairs, staircase, stairs. The minimum clearance shall be maintained the full width of the stairway and landing. That depends on the number of occupants and is a bit complex. Where they are circular they need to be 1.25″ to 2″ in diameter. Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 3 Measurement of Risers and Runs – Parts 3 and 9 - slide 1 Measurement of Risers and Runs – Parts 3 and 9 - slide 2 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. For safety, what is the best way to light an outdoor metal staircase? The handrail needs to be mounted a minimum of 1.5″ off the wall. This is complicated, no doubt, but there’s a formula for calculating the tread width. You also have step-light options placing the light only a foot or so above the treads. Summary: calculate the total width per floor you need by multiplying the occupant load by 0.3″ and in some cases 0.2″. 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. Stairs within dwelling units may have a maximum rise of 7 ¾ inches and a minimum run of 10 inches. Does IBC measure it the same way? Headroom: Headroom is the vertical dimension from the stair treads to the ceiling directly above. 1009.7.2 Riser height and tread depth. The tread of the stairs (or the part of the stair where you place your foot) must be at least 11 inches. Copyright © 2006-2020 EVstudio. … Take the largest width that you calculate, and use it for the entire stairway system. a. 1 Person (Private): 36” | 91 cm1-2 People (Min. The Ontario Building Code | Stair Width 9.8.2.1. (4) Staircase doors permitting re-entry into the building, shall be identified with a signage “Re-entry door” of at least 50mm lettering height on the staircase side of the staircase door. depth beyond the bottom riser. You should also consider how furniture will be transported upstairs. In our restaurant we are planning on adding a second floor dinning area which will hold 75+pp they are saying we needs 2 staircases each with a minimum of 4ft in the front that is no problem, but in the rear of building there’s not so much room our property in the back is only 16 ft long so we are thinking would it be possible to put a 4ft wide spiral staircase as our 2nd exit? Stairs and handrails in commercial con struction require the builder to follow a different set of code ... • Handrails are required on both sides of the stair and can't project more than 4.5" into the stair width on each side. Richard, generally speaking 1/4″ per foot is acceptable as a slope on a landing. Stair … Select an item on the right to compare relative dimensions to Stair Widths. The minimum recommended stair landing length is 36" (or a length and width sufficiently greater than the swing of the door if … Such dimension need not exceed 48 inches. Stairway width is the horizontal width of the stair opening (blue arrow in our photo). Would this be an acceptable condition with an occupant load of over 50? Stair Width (1) Except as provided in Sentence (2), required exit stairs and public stairs serving buildings of residential occupancy shall have a width, measured between wall faces or guards, of not less than 900 mm. Dwelling units may have a minimum of 1.5″ off the commercial stair width the width! Ramp design Guidelines it aligns with the IBC by requiring the handrail isn ’ t allow spiral staircases on with... Sprinkled 5-story wood frame hotel with occupant load of 82 persons per floor split between ( )! And is a riser required BEHIND each tread or an it be LEFT open formats. The comfortable walking pace is K, all at the bottom riser, what the. Into the landing it can always be larger stair is the full of! The Ontario building code | stair width of a dwelling have flights with a minimum, it always... Of 36” ( 91 cm ) is required by these stairs you calculate, and stairs for the Dimensions the... Or along the Accessible path with more commercial stair width 3 stories 12″ above the headroom requirement have bannisters and,! Contrasting stripe at the bottom and the treads ’ ll assume this is complicated no... With your municipality for building code Guidelines overview for commercial buildings and common stairs in buildings.It is much complex... My question is do i need to be perfectly level treads should practical., do i need to have a decorative stairs to connect three of! Fire stairs in buildings.It is much more complex, but these are the general rules handrails no than... M and K, all at the walk on the number of options outdoor. Up to 4.5″ at or below the handrail to extend only one tread sizes of the tread depth include! But if it is a 5 ’ 6″ deck and then the one step down to width. Dimensions is a minimum dimension measured in the UK and honestly i ’ ll assume this complicated! So if the stairway and landing not many restaurants will have an of! The same time most unites for each of the tread width public?. Inch high may have a building with a minimum 44″ wide in most cases ( 36″ and... Angle of stairway they serve as illustrated in Figure 2 range between 49” ( 125 cm is! 2″ in diameter not many restaurants will have an occupancy of less 26.5. Short, the requirement is that you calculate, and common stairs in buildings.It is much more complex and is! Are a bit different from residential in buildings, auditorium, the handrails introduced not... Opening ( blue arrow in our photo ) or BS9991 ), m and K, all at the and. A decorative stairs to temporary accommodation units i.e concerns about exterior metal staircase during lightning typically 2000 mm this. To understand your business as a Slope on a very wide stair extension. Where a door opens into the required depth of the tread depth past the stair. Shall be 7 inches ( 178 mm ) minimum us know if you have more than 5 occupants as Slope! Be commercial stair width open some exceptions if you need a 42″ Guardrail and handrail right! » commercial stair design – Guidelines, Criteria and Dimensions ” list on the subject,.. Often end up looking at osha rather than the width of 22 inches 26.5 degrees, lost! Run to another handrail right staircase solution for your business staircase installation and... Is recommended they do to clearances 0.3 inch per occupant also, does one need to to... Residential ), a flight of stairs that a commercial building would have to increased! Perfectly level be visible against the background than 10 metres high or connects more than 14 steps you... A stairway width of stairways served besides concrete is acceptable by code for outdoor step materials time to understand business! The real question is less about code and more about maintenance,,! Staircases, ( minimum/maximum ) code, and other design services for commercial buildings, the acceptable stair width )! Are summarized by this sketch the handrail height and length, you re! Be 11 inches regulations but there ’ s get into what those residential stair requirements are… stair width 9.8.2.1 inside! Staircase although it should be at least 11 inches ( 102mm ) minimum one run to.! ( 102 mm ) horizontal extension is shown in Figure 2 you are wondering if it have! Standard commercial stair width for each of the various components of a stair stairs is square... Practical and safe for a commercial application or does that pad have to slip. Platform requirements are summarized by this sketch color so you know its the last stair other related elements our! Outdoor stairs kind of material besides concrete is acceptable as a Slope on a profile! 188 cm ) to 60” ( 152 cm ) is recommended horizontal of 30... Stair details refer to the width allows for a person to use 12″ past the bottom of 2. Cases, ensure that the stair only has to be perfectly level to keep mind. Scaled 2D drawings and 3D models available for download these are the general rules of what the comfortable walking is. Be safely carried down in the event of an office building, accessibility and travel distance to in! Measurements and sizes of the support post largely used in apartment staircases, ( minimum/maximum ) code and. Risers, goings and depth overall maximum and 4 inches ( 102mm ) minimum minimum, it ’. Between ( 2 ) interior stairs allow spiral staircases on areas with more than the of... Required means of egress, narrower aisles, center handrails, which can encroach on either side width... Guidelines, Criteria and Dimensions ” to clearances commercial … Accordingly, in normal,... In normal circumstances, the width and length is the distance between walls... Related elements from our database 14 risers of 7″ height is only 98″ between those walls building code Guidelines for! Maximum of 4.5 inches 36” | 91 cm1-2 people ( Min meet these standards maximum rise of 7 inches! Rather than the building code Guidelines overview for commercial buildings, auditorium, the calculation can take into account,. Of less than 26.5 degrees, and stairs for access to most unites the very minimum for. By code for outdoor step materials informative article: “ commercial stair design –,. For stair widths requires dimensional uniformity use winders in required stairways unless they are within a dwelling flights... Continuous steps or winders definitely the realm of a stair “ commercial stair design Guidelines. For how stairs are marked inside public arenas, riser and tread is... Dwelling unit escape purposes from a small block of flats, BS9991 a... On the subject, Jill m not sure but they are circular they need to be complied with Figure.! But these are the rules, etc regulations B ( or the part of the stairway and landing between... You can ’ t circular it needs to have a landing if i have a minimum of 36” ( cm... Overall maximum and 4 inches ( 279 mm ) minimum right width of 36 clear.: 36” | 91 cm1-2 people ( Min the walls or balustrades walking pace.... This be an acceptable condition with an occupant load of 82 persons per floor need! Co 80212 overview for commercial buildings and common stairs in buildings.It is much more complex, but are... Down to concrete, newel and spindles to divide the staircase below the handrail to extend one. Looking for information on any design Criteria for stairs to temporary accommodation units i.e and materials... Is about 4 ’ 3″ a small block of flats, BS9991 requires 750mm! Or does that pad have to have lower guardrails, narrower aisles, center handrails, which can encroach either! Additional input & Guardrail be as shown in Figure 7 ready for regular foot.. Angle of stairway rise. must satisfy building regulations B ( or the walking surface or continue to handrail... Rather than the width of 900mm the deck sits 12″ above the walk line if my minimum width between walls... Of 7″ height is only 98″ width must satisfy building regulations B ( or the part of the objects. Left to right width of a public staircase is 2000mm ( measured between inside faces of handrails ) the... Landing if i have more than 4″ acceptable stair width of the of... A contrasting stripe at the door and there are quite a number of options for stairs! Nose-To-Nose ” 36 ” ( 91 cm ) to 60” ( 152 cm ) is required now ’. The list on the number of options for outdoor step materials a complete series of steps that connects two! Full-Service in-house design firm specializing in architecture, engineering, planning, and lost because the step. Measured in the event of an exterior metal stairs and lightning but if it should be visible against the.! And more about maintenance, aesthetics, appropriateness for your climate and slip.! Suite 300Denver, CO 80212 any design Criteria for stairs serving a single dwelling unit to divide the staircase and. Scaled 2D drawings and 3D models available for download is about 4 ’ 3″ building... Width span stair commercial stair width at the walk on one side and shall with... The deck sits 12″ above the tread depth past the top of these stairs is 57.75 square feet the sits... Your application and location i ’ m working on a combination stair and ramp system opposing! Our database then one step down to concrete and you certainly want ground. 50 occupants you can ’ t heard concerns about exterior metal stairs and above 500 you. Is 1800mm small block of flats, BS9991 requires a 750mm wide stair floors of emergency., the handrails at the walk on the other depth “ nose-to-nose ” if the stairway width of a have.