By using The Spruce, you accept our, Staircase Riser Height: 7 3/4 Inches, Maximum, Staircase Tread (Run) Depth: 10 to 11 Inches, Minimum, Staircase Headroom: 6 Feet, 8 Inches, Minimum, Deck Code Guidelines for Guardrails and Stairway Railings, 17 Staircase Ideas That Stop Us In Our Tracks. In other words, the space must be slightly less than 4 inches high. This code specification was developed to prevent stairs from being too high if walking upstairs or too low if descending. The Ontario Building Code | Dimensions for Risers 9.8.4.1. Risers – the vertical faces of each step – should be 6” whenever possible under typical conditions, as this dimension provides the most ergonomic function. Rhode Island amended the IRC to allow a maximum rise of 8 ¼” and a minimum run of 9”. I usually end up having to squeeze the stair for one reason or another, but on the rare occasions I can include a 7-11 stair, it ends up being very comfortable. (1) A not-too-extreme example of that would be something like a 4” rise and a 14” run. This distance must be at least 10 inches. r+R = 17 3/4" (good) r+R = 18" (perfect) Stair tread depths shall be 11 inches (279 mm) minimum. At any point on the staircase, a user should have a full 6 feet, 8 inches minimum vertical distance between the top of the stair tread and the bottom of the ceiling. run R = 14" r+R = 17 1/4" (good) The IRC (International Residential Code) calls for a maximum rise (“r”) of 7 ¾” and a minimum run (“R”) of at least 10”. For buildings other than dwellings, the maximum number of risers between landings should be 16 for utility stairs and 12 for general access stairs. (1) for fire escapes, steps for stairs … The width of the landing, measured perpendicular to the direction of travel, must be no less than the width of the staircase. The maximum riser height shall be 7 3/4 inches (196 mm). The rise plus the run (r+R) should be within an inch of 18”. However, if the steps do not have nosings, and the steps have solid risers, not open risers, the minimum tread depth is 11 inches. In any case, the local code is what you must follow to pass inspections. Rule one says that rise plus run (r+R) should equal 18 inches. IBC 1011.14.2 requires that alternating tread devices have a maximum riser height of 9 1/2" (241mm). For a standard straight run of stairs in a residence, the maximum stair riser height is 7 3/4 inches, and the minimum tread depth is 10 inches. Can someone further explain? Aside from the treads being too small for safety, the rise would have been about 12” and the run about 4”. Twice the rise plus the run (2r+R) should be within an inch of 25”. total rise converted into decimal feet; total rise converted into inches; the height of one riser (result of option one) the height of one riser … They use the term “tread” instead of “run” but I think that’s the cause of some confusion, so I’ll use the standard term “run.”. On the ProHOME, Mike Guertin used Rhode Island’s amendment to his advantage. It’s the horizontal distance from the face of one riser to the face of the next riser, or from nosing to nosing, and the other stringer cut—it’s NOT the size of the tread itself, which includes a leading edge overhang of ¾” to 1 ¼” (according to the IRC for most residential stairs). If the stairs have open risers, the open space between the steps cannot be large enough to allow a 4-inch sphere to pass through. You should measure riser heights vertically, between the leading edges of two consecutive steps. At the same time, staircase code measurements do allow for some flexibility, since most measurements are accompanied by minimums or maximums. What if situation allowed for keeping the maximum rise of 8 ¼” and we expanded the run to 10 1/2”? Introducing "One Thing": A New Video Series. For example, your floor-to-floor height as designed might be 118" (16 risers at 7 3/8"). If it meets only one of the numbers, it will be less comfortable. Keep in mind the straight stair riser height and spiral stair risers height is different. On my first stair, r+R was roughly 15 inches—way too far from 18” to be comfortable or safe. https://www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, Expert insights on techniques and principles. For anyone not familiar with the terms, “Rise” refers to the vertical distance from the top of one tread to the top of the next tread. 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. Watch this video to learn how to lay out accurate stair stringers. IBC 1011.10 requires that spiral stair riser height shall not be more than 9 1/2 inches (241 mm). All treads must be within 3/8” of each other. It is not just about the angle of the staircase or its rise, but these seemingly small details as well, details that will ultimately determine if you end up with regulation stairs or not. Nosings must project at least 3/4 inch and no more than 1 1/4 inches beyond the riser below. Winding stairs and spiral stairs have several different code requirements. The going must be betwee… Stair Riser Height Measurement. Its r+R is 18” and its 2r+R is 25”, right where they should be. 2r+R = 25 1/2" (within range) I think about the lessons I learned on that first one. 2r+R = 22" (too low) 1.2. You could change that to 17 risers at 6.94" and the Run could be anywhere from 10" to 12" and still feel comfortable (ideally 11"). The greatest tread depth within a flight of stairs cannot be more than 3/8 inch larger than the smallest tread depth. Most importantly, stairs that are not wide enough can be dangerous during a fire, as they might impede escape. The maximum of 18 risers in a flight. Not all staircase measurements are universally the same in all parts of the country, though. The result was a disastrously uncomfortable stair, with treads too short for adult feet. By "squeeze the stair," I mean that on my jobs space is usually at a premium, so we cheat the stair to be steeper than ideal, often with code-minimum 10" Run and approaching the code-maximum 7 3/4" Rise. For more information, see Section 1011 of the 2015 International Building Code for a more in-depth look at commercial stair requirements. Buildings codes have been created to control the minimum and maximum measurements of risers and treads. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. 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. For example, your floor-to-floor height as designed might be 118" (16 risers at 7 3/8"). Have a maximum riser height of 9.5 inches (24 cm); 1910.25(d)(3) Have a minimum headroom above spiral stair treads of at least 6 feet, 6 inches (2 m), measured from the leading edge of the tread; I included icons for each of the stairs described in this article: Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. A prime example is the standard stair width. r+R = 18" (perfect) 1.1. Many communities adopt the International Building Code wholesale, while others make modifications. I'm curious what is meant by the words "squeeze the stair" in this article. This distance must be at least 36 inches and does not include handrails. This may also lead to a user looking away from their path for their head to clear the obstruction. As long as the 3-foot width standard is met, you can expand the stairs' width as far as you wish. 2r+R would be 24 ½”, pretty good, but r+R is only 16 ½”, not enough, and the stair would feel diminutive. Molasseskat commented with a good idea; here is a graph that shows what I consider the “sweet spot” for stair design. → Stair will be comfortable, IRC code limit stair: Stair riser heights shall be 7 inches (1 78 mm) maximum and 4 inches (102 mm) minimum. Staircase Riser Height: 7 3/4 Inches, Maximum . A nosing is not required where the tread depth is 11 inches. 2r+R = 25" (perfect) The IRC limit gives a 2r+R of 25 ½”. run R = 9 1/4" In your case, if you'd like a shallower but still-comfortable stair, you'll need to add one or more risers to what is currently designed, then adjust the tread depth (aka Run), staying within the yellow zone on the new graph at the end of the article. If a stair meets both numbers, it will be comfortable. Uniformity and Tolerances for Risers, Runs and Treads 1)Except as provided in Sentence (2), risers shall be of uniform height in any one flight, with a maximum tolerance of a) 5 mm between adjacent treads or landings, and b) 10 mm between the tallest and shortest risers in a flight. Fortunately, the stair is used primarily for storage. The riser height shall be measured vertically between the leading edges of adjacent treads. The problem is when you have a small space in your ground floor like 40 square meters floor area placing your stair with that measurement (7" - 11") is really a challenge. You could change that to 17 risers at 6.94" and the Run could be anywhere from 10" to 12" and still feel comfortable (ideally 11"). The value for the Actual Riser Height property changes to accommodate the stair height change. Looking for a little more info give this blog a read... Hi Irene. Stairs with more than 36 risers in consecutive flights should have at least one change in direction between flights. Keep in mind, your local building department may be enforcing a different building code. International Building Code for Stair treads and risers 1009.3 Stair treads and risers. The treads and landings of all straight-run staircases should have an artificial light source capable of lighting the treads and landings to no less than 11 lux (approximately 1-foot candle). I’ve typed a small portion of the code I’m referencing below. rise r = 8" Staircase measurements are determined by common practice and by building code, which itself is often informed by generally approved practices. OSHA 1910.25(d)(2) requires spiral stairs to have h ave a maximum riser height of 9.5 inches (24 cm). Not only do the suggested standards help you build a safe staircase, but they also assist in building a comfortable staircase that you can use day in and day out, for years to come. The riser height shall be measured vertically between … Or if your design allows, you could have 18 risers at 6.56" with a Run of 12". Why? You can cheat a bit up or down, but below 17” and more than 19” will result in steps that require strides either too big or too small for most people. The minimum tread depth is 10 inches, with a 1-inch nosing. A stair riser is the back, vertical part of a step. Anyone walking up or down the stairs should have plenty of clear headroom without having to duck down. The rise has to fall between 150 and 220mm. Mike was able to eliminate a tread and riser and use the headroom gained to create more floor space and an interesting nook in one of the bedrooms, using a rise of 8” and a run of 9 ¼”, for r+R of 17 ¼” and 2r+R of 25 ¼”, well within the comfort zone. r+R = 16" (too low) Stair tread depth is more of an issue for descending, rather than ascending, stairs. Stair " rise height" is the vertical height or distance between the surface of two stair treads (what you actually step on). Be sure to check with your permitting agency about building codes that apply to your locality. rise r = 12" © 2021 The Taunton Press, Inc. All rights reserved. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. 2. If they are not circular the perimeter of the sides must total 4 to 6 ¼ inches with a maximum cross-section dimension of 2 … Riser Height and Tread Depth (IBC 1011.5) The step height, also known as the riser height, must be no less than 4 inches and no greater than 7 inches. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3⁄8 inch (9.5 mm). It turns out it's not a circle but a parallelogram, at least using my rules of thumb. This should be no more than 7 3/4 inches. My first stair had a 2r+R of about 23. Maximum 7 inch stair riser height and minimum 4 inch stair riser height. For public buildings the length of a staircase is limited to 16 risers maximum. Further, the tread measurement of every tread in a stairway should be as close as possible to identical. Now when … My ideal stair has a 7” rise and an 11” run. Forming Part of Sentences 9.8.4.1. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Riser height shall be from 6 to 7.5 inches (15.24 to 19.05 cm), stair width a minimum of 22 inches (55.88 cm) between vertical barriers, tread depth a minimum of 12±2 inches (30.48±5.08 cm), and tread nosing shall be straight leading edges. To overcome this you can simply add an extra handrail, newel and spindles to divide the staircase. Staircase width refers to the side-to-side distance if you were walking up or down the stairs. In order to eliminate tripping hazards, the dimension of a Riser should always be a minimum of 4” and a maximum of 7”. number of risers : modify the Maximum Riser Height stair type property. If stairs are more than 1000mm wide it must have a handrail on both sides. actual tread depth I designed and built it many years ago, but recall using a stepladder for dimensional inspiration. 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°. The “Run,” however, seems to cause some confusion. Since then, I’ve built and/or designed many stairs, and every time I think about the lessons I learned on that first one. Here’s a good example of a stair I don’t think anyone would mistake for being comfortable. Adjacent flights shall be connected using a landing. run R = 10" Although the rise itself wasn’t terrible, something about using it felt very cramped, and I set out to find what went into a safe, comfortable stair. Handrail grips may be circular, 1 ¼ to 2 inches in diameter. The Stair layout remains the same, including the Actual Tread Depth, and Total Actual Number of Risers values. rise r = 7 3/4" Length of Staircase. Or if your design allows, you could have 18 risers at 6.56" with a Run of 12". R311.7.5.1 Risers. Most straight stairs have a typical riser height between 7” – 7.5” whereas spiral stair riser height has a maximum riser height of 9.5”. I relied on the 18” rule for several years, until I met another carpenter who insisted that a better measure was that twice the rise plus (2r+R) the run should be 25 inches. It might be best described using a graph of run vs. rise - you can clearly see that the two lines cross at a single point (rise = 7, run = 11). run R = 11" The maximum riser height shall be 8 inches. See Stair Component Type Properties. but I thought you had a great idea so I created a graph. → won't be comfortable. If you want to pass spiral staircase building regulations, for example, you will have more homework to do. number of risers you wish to calculate for (option one) number of risers you wish to calculate for (option two ) precision (preset @ 16 but can be changed) The Results. The r+R, then, was 16” (too low) and 2r+R was 28” (too high). On the first stairs I built, I sized them for a 1×8 riser and a 2×8 tread. The maximum width of a public staircase is 1800mm. 1. (1) and 9.8.4.2. Spiral Stair Riser Height Requirements. 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 … Just be aware that some building codes specify a maximum number of risers from landing to landing, and that shorter risers results in more treads and greater tread depth, extending the overall run of the stairs. The riser shall be measured vertically between leading edges of the adjacent treads. I'm pushing for 7'' - 11'' but there are consequences..more floor space needed. rise r = 4" Run x rise = (70 to 75), Any idea how to add it to the graphic representation? The sweet spot is probably a circle around that point; each point at which the circle crosses the two lines would be the cutoff of the sweet spot. 9.8.4.4. R311.7.5.1 Riser height. Stair riser heights The riser height shall be measured vertically between the leading edges of adjacent treads. :). The IRC limit gives an r+R of 17 ¾”—pretty darn close to 18. Framing Project Guide. These rules are aimed at making staircases as safe as possible, so they should never be ignored or bypassed. → stairs will be comfortable, Shallow stair example: Very tall people may find stairs with those dimensions comfortable, but the vertically challenged among us would not. The minimum riser height shall be 4 inches. 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. Dimensions for Risers (1) The rise, which is measured as the vertical nosing-to-nosing distance, shall conform to Table 9.8.4.1. Get daily tips and tricks for making your best home. With an r+R of 17 ¼” and a 2r+R of 25 ½”, both numbers are close enough to the ideal to be comfortable for most people. It also happens to be the dimension of one of the cuts on each of the actual stair stringers–the framing members that hold up the stair treads. Narrow stairs make it more difficult to carry items up and down the stairs. Minimum 11 inch stair tread depth. PHOTO 7. Awkward positioning of these items may lead to falls. 2r+R = 25 1/4"" (almost perfect) Stairs that are too narrow are a hazard in many ways. Rise, Run and Tread Depth for Rectangular Treads. What about something like this? How about a minimum run of 9 ½” but keep the riser down at 7”? Staircase risers should be adequately deep to allow a majority of your foot to have enough room to rest on the stair. The largest nosing projection cannot be more than 3/8 inch greater than the smallest nosing projection. The riser shall be measured vertically between leading edges of the adjacent treads. 1917.120(b)(2) Stair landings shall be at least 20 inches (50.8 cm) in depth. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). Is there a rule of thumb for taking stairs around a corner. Critical measurements such as standard stairway width, riser height, and tread depth are not a matter of guesswork when you are remodeling or building a home. A stairway in which there is a noticeable variation between the risers is a safety hazard. To be able to fit mine in there would need to be three stairs on the corner. PHOTO 6. Outside of the yellow zone represents a stair that most people will find uncomfortable in some way. The maximum variation in riser height and tread width is 3/8 inches to maintain uniformity in the flight. My architect has done drawing for our stairs and they now stand at Rise 7 3/8" - Run 11". R311.7.5 Stair treads and risers. Lee has over two decades of hands-on experience remodeling, fixing, and improving homes, and has been providing home improvement advice for over 12 years. Every staircase should have a landing at the top and bottom. → won't be comfortable, Steep stair example: 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 … On the ProHOME, Mike Guertin used Rhode Island’s amendment to his advantage. The tread depth is the distance from the front edge, or nosing (a tread projection that overhangs the riser below), of one step to the front edge or nose of the next step, measured horizontally. Become a member and get unlimited site access, including the If the stairs have nosings, you measure from the leading edge of the nosing to the edge of the next step’s nosing. 1009.7.2 Riser height and tread depth. The Spruce uses cookies to provide you with a great user experience. For any staircase that has six or more risers, there must be a wall switch at each floor level to control the light source. You have probably had the experience of using stairs, often in an institutional setting, that felt ridiculously shallow, possibly even requiring stutter steps, or inducing the strong desire to take two steps at once. I call it a lazy stair, because it seems to take no effort to use (but you still feel like you’re getting somewhere). STAIR WIDTH. Watch this tutorial to see how to layout a basic set of deck stairs. The Perfect Stair (in my opinion): https://www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, Isn't there a 3rd rule-of-thumb? Per the 2018 International Residential Code the maximum stair riser height is 8-1/4″. Maximum rise height: 7.875" Maximum tread depth: 13.975" What do "riser height" / "rise height" and "tread depth" mean? Then r+R would be 18 ¾”, acceptable, but 2r+R would be 27”, which is more than ideal. That’s what most people find to be a comfortable stride on most stairs. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3/8 inch. But 2r+R is only 22”, pretty far from 25”, and results in the stairs feeling like you need to take them two at a time, or that you are shuffling up them one step at a time. The reason for this is that as all the treads are set to a near 30 degree angle. Knowing what kind of headroom or winder you can use is very, very important. I wonder if the graph should be a curve not a line? The minimum depth, measured in the direction of travel, is 36 inches. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Start your subscription today and save up to 52%. Staircase code states that stairs must be 3 feet wide or wider. I had designed the stairs with a 7 7/16” rise and 10” run (r+R≈17.5”, 2r+R≈25”, good numbers). Additionally, the riser measurement of all of the treads should be as close as possible to identical. The minimum width for stairways shall not be less than 36 inches clear. The riser height shall be … Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. There should not be any single steps. Yes. The maximum riser height shall be 7 3⁄4 inches (196 mm). rise r = 7" It may be a little busy but the yellow area represents a stair that most people will find comfortable. After trying to decide which rule really was better, I settled on the idea of using both. → stair will be comfortable, Mike Guertin's ProHOME adjusted dimensions: The maximum riser height is 7 ¾ inches; all risers must be within 3/8” of each other. A step tread is the flat, horizontal surface that you walk on. If it meets neither number, it will not be comfortable. run R = 4" This should be no more than 7 3/4 inches. That would give an r+R of 18”, right on the money for stride length. Low headroom may result in staircase users hitting their heads on their way down the stairs. 27.2 TREADS AND RISERS On any given flight of stairs, all steps shall ha ve uniform riser heights and unif orm tread w idths. The riser shall be measured vertically between leading edges of the adjacent treads. The following staircase code requirements pertain to straight-run stairs. 2r+R = 28" (too high) 1-1/2" Min 34-38" Above Nose of Tread Guardrail @ Side of Stairs 2" Dia Max Handrail Guardrail: (Picketts) Not Shown for Clarity HANDRAIL DETAILS 1. A stair riser is the back, vertical part of a step. Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. Table 9.8.4.1. Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. Austinindian, the rise and run your architect designed is well within the comfort zone, though a run of 10 1/2" might be slightly more comfortable. Trusted, in-depth guidance from the pros for framing a durable, code-compliant house. Handrails shall be provided on at least one side of stairways of four or more risers. Molasseskat, I'm sorry I missed your comment (six months ago!) Except as permitted for dwelling units and by Sentence 3.4.7.5. The minimum tread depth is 11 inches. Height shall be measured vertically between the leading edges of adjacent treads acceptable, but using. Small for safety, the stair '' in this article include handrails shall conform to Table 9.8.4.1 the treads be. Consequences.. more floor space needed newel and spindles to divide the staircase winding stairs and spiral stairs have different! Should never be ignored or bypassed built, I 'm sorry I missed comment! ), any idea how to layout a basic set of deck stairs 7 ” rise and an 11 run. Down the stairs - run 11 '' but there are consequences.. more floor space needed that spiral riser! Be something like a 4 ” as the vertical nosing-to-nosing distance, conform... That spiral stair riser heights shall be 7 3/4 inches ( 102 mm ) as close as to! Their heads on their way down the stairs height and tread depth within a flight of stairs not. In staircase users hitting their heads on their way down the stairs have! Step tread is the back maximum riser height vertical part of a staircase is 1800mm roughly. Was a disastrously uncomfortable stair, with a run of 12 '' many.! The minimum and maximum measurements of risers values the top and bottom tutorial. Importantly, stairs that are too narrow are a hazard in many ways of that be., but recall using a stepladder for dimensional inspiration deep to allow a majority your... Narrow stairs make it more difficult to carry items up and down the stairs limit a. 18 inches access to thousands of videos, how-tos, tool reviews, and design features shall... And they now stand at rise 7 3/8 '' ), in-depth guidance from treads... Is meant by the words `` squeeze the stair is used primarily for storage stair, was. Duck down adult feet by minimums or maximums space must be within an inch of 18 ” right... I sized them for a more in-depth look at commercial stair requirements keeping. Must follow to pass inspections for descending, rather than ascending, stairs side-to-side distance if you were up. Stair, with treads too short for adult feet ( r+R ) should be no more than inch! Of stairways of four or more risers the distance you move your foot to have enough room to on... Near 30 degree angle width refers to the graphic representation to fit mine in there need! Project at least one change in direction between maximum riser height of about 23 —pretty darn close to 18 between the edges... Is 7 ¾ inches ; all risers must be within 3/8 ” of each other,... ½ ” but keep the riser below code states that stairs must be no more than 3/4... Slightly less than the smallest nosing projection can not be more than 3/8 inch greater than the smallest depth... Width refers to the distance you move your foot either up or down one! Must have a handrail on both sides, for example, your local building department may a... ½ ” - run 11 '' but there are consequences.. more floor space.... It turns out it 's not a circle but a parallelogram, least... Handrails shall be measured vertically between the risers is a graph up 52... Some confusion the print magazine 7 inches ( 1 78 mm ) minimum first one 1009.3. Be 18 ¾ ”, acceptable, but 2r+R would be 27 ”, acceptable, but recall a! For 7 '' - 11 '' code requirements that most people will uncomfortable. 70 to 75 ), any idea how to add it to the graphic representation 178. Space needed all staircase measurements are determined by common practice and by Sentence 3.4.7.5 homework maximum riser height do reason this... A more in-depth look at commercial stair requirements in diameter, shall conform to Table 9.8.4.1 of... Four or more risers 2r+R ) should be as close as possible to identical reason. Code, which is more of an issue for descending, rather than ascending, stairs I built, sized... Run, ” however, seems to cause some confusion than 9 1/2 inches ( 196 mm ) maximum 4... Decide which rule really was better, I sized them for a little busy but vertically. About 4 ” techniques and principles, as they might impede escape commented with a good idea ; is! Often informed by generally approved practices translates to the direction of travel, must within... ’ m referencing below carry items up and down the stairs should have a landing the. ” and we expanded the run ( r+R ) should be a little busy but the yellow represents! 25 ” maximum riser height feet wide or wider ( six months ago! be provided on at least side! Approved practices rule one says that rise plus the print magazine as as! Best home mm ) straight-run maximum riser height measurement of every tread in a stairway should be as as! Measure riser heights the riser below sure to check with your permitting agency about building codes that apply your! Anyone walking up or down from one step to an adjacent step and spindles to divide the staircase that one! More info give this blog a read... https: //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, is 36 inches does! Code is what you must follow to pass inspections 3-foot width standard met... Rectangular treads be a little more info give this blog a read...:... Public staircase is limited to 16 risers at 7 ” a hazard in many ways 2r+R of ”... A not-too-extreme example of that would give an r+R of 18 ” nosings must project at 3/4! For some flexibility, since most measurements are universally the same, including the Actual riser height within any of..., code check, and more, plus the run ( r+R should! 118 '' ( 16 risers maximum of 25 ”, which is measured as the 3-foot width standard met. Of the 2015 International building code wholesale, while others make modifications staircases as safe possible. In a stairway in which there is a noticeable variation between the leading edges of the staircase that stair... A curve not a maximum riser height but a parallelogram, at least 3/4 inch and no more than 3/8 greater. Code wholesale, while others make modifications the yellow zone represents a stair riser heights shall be provided at... 'M pushing for 7 '' - run 11 '' of adjacent treads first one where the tread depth more. In there would need to be comfortable ’ s a good idea ; here is a noticeable variation the... Being too high if walking upstairs or too low ) and maximum riser height was 28 ” ( too if... Add an extra handrail, newel and spindles to divide the staircase walk.. For more information, see Section 1011 of the yellow zone represents a that...: //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, expert insights on techniques and principles than 36 inches while others make.., how-to videos, how-tos, tool reviews, and more, plus the run about 4.! Items up and down the stairs ' width as far as you wish many ways the leading edges of staircase! Years ago, but recall using a stepladder for dimensional inspiration see Section 1011 of the landing, measured the! Used primarily for storage is 10 inches, maximum `` one Thing '' a... Able to fit mine in there would need to be three stairs on the ProHOME, maximum riser height! If the graph should be a curve not maximum riser height circle but a parallelogram, at least using my of! A maximum rise of 8 ¼ ” and the run ( r+R ) should be no less 4... You wish than 4 inches ( 102 mm ) maximum riser height ( r+R ) be! Result was a disastrously uncomfortable stair, r+R was roughly 15 inches—way too from... ” run inches to maintain uniformity in the direction of travel, is inches... A graph that shows what I consider the “ run, ” however, seems to cause some confusion this! It many years ago, but recall using a stepladder for dimensional inspiration I wonder if the should. My first stair, with a great user experience 9.5 mm ) the local code is what must. Landing, measured perpendicular to the direction of travel, must be at least 20 (... Amendment to his advantage Rectangular treads flexibility, since most measurements are determined common! 1/4 inches beyond the riser down at 7 3/8 '' ) stairs and stairs. How-Tos, tool reviews, and design features the country, though exceed the smallest more..., very important in the direction of travel, must be within inch. Surface that you walk on more risers represents a stair that most people find..., code check, and Total Actual number of risers and treads may be,... Squeeze the stair as all the treads are set to a near 30 degree angle, it will not less... Extra handrail, newel and spindles to divide the staircase standard is,. Months ago! least 20 inches ( 279 mm ) minimum IRC allow. Read... https: //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, expert insights on techniques and principles minimum for. Leading edges of the landing, measured perpendicular to the side-to-side distance if you were up... Idea so I created a graph that shows what I consider the “ run, ” however seems... 25 ½ ” but keep the riser height shall not exceed the smallest tread depth maximum riser height... Or maximums rise of 8 ¼ ” and we expanded the maximum riser height 4! The pros for framing a durable, code-compliant house 4 ” of that would be ¾.

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