run R = 11" 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. The riser height shall be measured vertically between … 1009.7.2 Riser height and tread depth. A stair riser is the back, vertical part of a step. Twice the rise plus the run (2r+R) should be within an inch of 25”. 1. rise r = 12" Maximum rise height: 7.875" Maximum tread depth: 13.975" What do "riser height" / "rise height" and "tread depth" mean? but I thought you had a great idea so I created a graph. 2r+R = 22" (too low) I call it a lazy stair, because it seems to take no effort to use (but you still feel like you’re getting somewhere). This code specification was developed to prevent stairs from being too high if walking upstairs or too low if descending. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). Stair riser heights The riser height shall be measured vertically between the leading edges of adjacent treads. I'm curious what is meant by the words "squeeze the stair" in this article. 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. International Building Code for Stair treads and risers 1009.3 Stair treads and risers. 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 … Be sure to check with your permitting agency about building codes that apply to your locality. r+R = 18" (perfect) 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. 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. https://www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, Isn't there a 3rd rule-of-thumb? 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"). PHOTO 6. The maximum riser height shall be 7 3/4 inches (196 mm). actual tread depth Buildings codes have been created to control the minimum and maximum measurements of risers and treads. R311.7.5 Stair treads and risers. This should be no more than 7 3/4 inches. 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. On my first stair, r+R was roughly 15 inches—way too far from 18” to be comfortable or safe. Then r+R would be 18 ¾”, acceptable, but 2r+R would be 27”, which is more than ideal. The maximum width of a public staircase is 1800mm. The Spruce uses cookies to provide you with a great user experience. The going must be betwee… I designed and built it many years ago, but recall using a stepladder for dimensional inspiration. 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.”. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Its r+R is 18” and its 2r+R is 25”, right where they should be. Every staircase should have a landing at the top and bottom. Table 9.8.4.1. Or if your design allows, you could have 18 risers at 6.56" with a Run of 12". A nosing is not required where the tread depth is 11 inches. Handrail grips may be circular, 1 ¼ to 2 inches in diameter. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). 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. → won't be comfortable, Steep stair example: 1.1. If it meets neither number, it will not be comfortable. 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; 1.2. 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. Very tall people may find stairs with those dimensions comfortable, but the vertically challenged among us would not. The minimum tread depth is 11 inches. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Stair Riser Height Measurement. The riser shall be measured vertically between leading edges of the adjacent treads. 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. Further, the tread measurement of every tread in a stairway should be as close as possible to identical. The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3/8 inch. 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. The result was a disastrously uncomfortable stair, with treads too short for adult feet. r+R = 18" (perfect) The riser shall be measured vertically between leading edges of the adjacent treads. How about a minimum run of 9 ½” but keep the riser down at 7”? On the ProHOME, Mike Guertin used Rhode Island’s amendment to his advantage. Here’s a good example of a stair I don’t think anyone would mistake for being comfortable. The maximum of 18 risers in a flight. If you want to pass spiral staircase building regulations, for example, you will have more homework to do. To overcome this you can simply add an extra handrail, newel and spindles to divide the staircase. In any case, the local code is what you must follow to pass inspections. I wonder if the graph should be a curve not a line? Nosings must project at least 3/4 inch and no more than 1 1/4 inches beyond the riser below. My ideal stair has a 7” rise and an 11” run. R311.7.5.1 Risers. 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. Adjacent flights shall be connected using a landing. Not all staircase measurements are universally the same in all parts of the country, though. 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 … → Stair will be comfortable, IRC code limit stair: 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. This distance must be at least 10 inches. On the first stairs I built, I sized them for a 1×8 riser and a 2×8 tread. rise r = 7" The Perfect Stair (in my opinion): Narrow stairs make it more difficult to carry items up and down the stairs. The riser height shall be measured vertically between the leading edges of adjacent treads. It may be a little busy but the yellow area represents a stair that most people will find comfortable. 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. For more information, see Section 1011 of the 2015 International Building Code for a more in-depth look at commercial stair requirements. 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). 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. Per the 2018 International Residential Code the maximum stair riser height is 8-1/4″. I’ve typed a small portion of the code I’m referencing below. Framing Project Guide. Rhode Island amended the IRC to allow a maximum rise of 8 ¼” and a minimum run of 9”. 2r+R = 28" (too high) This should be no more than 7 3/4 inches. The largest nosing projection cannot be more than 3/8 inch greater than the smallest nosing projection. Staircase risers should be adequately deep to allow a majority of your foot to have enough room to rest on the stair. The maximum riser height shall be 8 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). The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. number of risers : modify the Maximum Riser Height stair type property. Anyone walking up or down the stairs should have plenty of clear headroom without having to duck down. r+R = 16" (too low) 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. run R = 14" 2r+R = 25" (perfect) Or if your design allows, you could have 18 risers at 6.56" with a Run of 12". 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. Watch this video to learn how to lay out accurate stair stringers. The minimum riser height shall be 4 inches. For example, your floor-to-floor height as designed might be 118" (16 risers at 7 3/8"). 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. The reason for this is that as all the treads are set to a near 30 degree angle. If stairs are more than 1000mm wide it must have a handrail on both sides. To be able to fit mine in there would need to be three stairs on the corner. Stair " rise height" is the vertical height or distance between the surface of two stair treads (what you actually step on). Minimum 11 inch stair tread depth. (1) This distance must be at least 36 inches and does not include handrails. PHOTO 7. → 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. The Ontario Building Code | Dimensions for Risers 9.8.4.1. Staircase code states that stairs must be 3 feet wide or wider. 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. OSHA 1910.25(d)(2) requires spiral stairs to have h ave a maximum riser height of 9.5 inches (24 cm). run R = 4" The riser height shall be … The greatest tread depth within a flight of stairs cannot be more than 3/8 inch larger than the smallest tread depth. If the stairs have nosings, you measure from the leading edge of the nosing to the edge of the next step’s nosing. 2. run R = 10" Watch this tutorial to see how to layout a basic set of deck stairs. Winding stairs and spiral stairs have several different code requirements. 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. For buildings other than dwellings, the maximum number of risers between landings should be 16 for utility stairs and 12 for general access stairs. That would give an r+R of 18”, right on the money for stride length. You should measure riser heights vertically, between the leading edges of two consecutive steps. 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. 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°. rise r = 4" r+R = 17 1/4" (good) 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. In order to eliminate tripping hazards, the dimension of a Riser should always be a minimum of 4” and a maximum of 7”. STAIR WIDTH. Staircase measurements are determined by common practice and by building code, which itself is often informed by generally approved practices. At the same time, staircase code measurements do allow for some flexibility, since most measurements are accompanied by minimums or maximums. What about something like this? For any staircase that has six or more risers, there must be a wall switch at each floor level to control the light source. Rule one says that rise plus run (r+R) should equal 18 inches. Forming Part of Sentences 9.8.4.1. 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. On the ProHOME, Mike Guertin used Rhode Island’s amendment to his advantage. Staircase width refers to the side-to-side distance if you were walking up or down the stairs. 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. My first stair had a 2r+R of about 23. The IRC limit gives an r+R of 17 ¾”—pretty darn close to 18. Fortunately, the stair is used primarily for storage. The “Run,” however, seems to cause some confusion. Most importantly, stairs that are not wide enough can be dangerous during a fire, as they might impede escape. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3⁄8 inch (9.5 mm). 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. I think about the lessons I learned on that first one. The maximum riser height shall be 7 3⁄4 inches (196 mm). The IRC (International Residential Code) calls for a maximum rise (“r”) of 7 ¾” and a minimum run (“R”) of at least 10”. Why? My architect has done drawing for our stairs and they now stand at Rise 7 3/8" - Run 11". The IRC limit gives a 2r+R of 25 ½”. Low headroom may result in staircase users hitting their heads on their way down the stairs. 2r+R = 25 1/2" (within range) (1) for fire escapes, steps for stairs … rise r = 8" run R = 9 1/4" 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. Run x rise = (70 to 75), Any idea how to add it to the graphic representation? Staircase Riser Height: 7 3/4 Inches, Maximum . Since then, I’ve built and/or designed many stairs, and every time I think about the lessons I learned on that first one. The following staircase code requirements pertain to straight-run stairs. The minimum tread depth is 10 inches, with a 1-inch nosing. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Molasseskat, I'm sorry I missed your comment (six months ago!) 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. Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. Hi Irene. Length of Staircase. Keep in mind, your local building department may be enforcing a different building code. If a stair meets both numbers, it will be comfortable. → stairs will be comfortable, Shallow stair example: 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. Dimensions for Risers (1) The rise, which is measured as the vertical nosing-to-nosing distance, shall conform to Table 9.8.4.1. 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 … A stair riser is the back, vertical part of a step. https://www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, Expert insights on techniques and principles. Trusted, in-depth guidance from the pros for framing a durable, code-compliant house. Additionally, the riser measurement of all of the treads should be as close as possible to identical. :). rise r = 7 3/4" Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Start your subscription today and save up to 52%. These rules are aimed at making staircases as safe as possible, so they should never be ignored or bypassed. Stair riser heights shall be 7 inches (1 78 mm) maximum and 4 inches (102 mm) minimum. 1917.120(b)(2) Stair landings shall be at least 20 inches (50.8 cm) in depth. 9.8.4.4. 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. Maximum 7 inch stair riser height and minimum 4 inch stair riser height. A prime example is the standard stair width. Spiral Stair Riser Height Requirements. 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). Now when … All treads must be within 3/8” of each other. In other words, the space must be slightly less than 4 inches high. Is there a rule of thumb for taking stairs around a corner. Looking for a little more info give this blog a read... Stair tread depth is more of an issue for descending, rather than ascending, stairs. 2r+R = 25 1/4"" (almost perfect) The minimum depth, measured in the direction of travel, is 36 inches. 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. Can someone further explain? The riser shall be measured vertically between leading edges of the adjacent treads. The value for the Actual Riser Height property changes to accommodate the stair height change. This may also lead to a user looking away from their path for their head to clear the obstruction. 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”. 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. 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. Stairs with more than 36 risers in consecutive flights should have at least one change in direction between flights. © 2021 The Taunton Press, Inc. All rights reserved. 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. R311.7.5.1 Riser height. Become a member and get unlimited site access, including the (1) and 9.8.4.2. Except as permitted for dwelling units and by Sentence 3.4.7.5. Aside from the treads being too small for safety, the rise would have been about 12” and the run about 4”. The minimum width for stairways shall not be less than 36 inches clear. Introducing "One Thing": A New Video Series. Risers – the vertical faces of each step – should be 6” whenever possible under typical conditions, as this dimension provides the most ergonomic function. Stairs that are too narrow are a hazard in many ways. The maximum variation in riser height and tread width is 3/8 inches to maintain uniformity in the flight. Handrails shall be provided on at least one side of stairways of four or more risers. IBC 1011.14.2 requires that alternating tread devices have a maximum riser height of 9 1/2" (241mm). Many communities adopt the International Building Code wholesale, while others make modifications. A step tread is the flat, horizontal surface that you walk on. Awkward positioning of these items may lead to falls. As long as the 3-foot width standard is met, you can expand the stairs' width as far as you wish. The r+R, then, was 16” (too low) and 2r+R was 28” (too high). 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 … For public buildings the length of a staircase is limited to 16 risers maximum. After trying to decide which rule really was better, I settled on the idea of using both. What if situation allowed for keeping the maximum rise of 8 ¼” and we expanded the run to 10 1/2”? 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. See Stair Component Type Properties. A not-too-extreme example of that would be something like a 4” rise and a 14” run. The width of the landing, measured perpendicular to the direction of travel, must be no less than the width of the staircase. Outside of the yellow zone represents a stair that most people will find uncomfortable in some way. Molasseskat commented with a good idea; here is a graph that shows what I consider the “sweet spot” for stair design. IBC 1011.10 requires that spiral stair riser height shall not be more than 9 1/2 inches (241 mm). A stairway in which there is a noticeable variation between the risers is a safety hazard. 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. Get daily tips and tricks for making your best home. 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. I'm pushing for 7'' - 11'' but there are consequences..more floor space needed. → won't be comfortable. 2r+R would be 24 ½”, pretty good, but r+R is only 16 ½”, not enough, and the stair would feel diminutive. The rise has to fall between 150 and 220mm. 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"). However, if the steps do not have nosings, and the steps have solid risers, not open risers, the minimum tread depth is 11 inches. The rise plus the run (r+R) should be within an inch of 18”. I had designed the stairs with a 7 7/16” rise and 10” run (r+R≈17.5”, 2r+R≈25”, good numbers). Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. It turns out it's not a circle but a parallelogram, at least using my rules of thumb. There should not be any single steps. r+R = 17 3/4" (good) 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. The Stair layout remains the same, including the Actual Tread Depth, and Total Actual Number of Risers values. 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. Knowing what kind of headroom or winder you can use is very, very important. Rise, Run and Tread Depth for Rectangular Treads. That’s what most people find to be a comfortable stride on most stairs. Yes. Stair tread depths shall be 11 inches (279 mm) minimum. Here ’ s what most people find to be three stairs on money! Stairs maximum riser height several different code requirements pertain to straight-run stairs back, vertical part of a step public is... The 3-foot width standard is met, you will have more homework to do and 4 inches 241... Width is 3/8 inches to maintain uniformity in the flight and bottom code was. Drawing for our stairs and spiral stairs have several different code requirements introducing `` one Thing '': a Video! And spiral stairs have several different code requirements pertain to straight-run stairs magazine. Can use is very maximum riser height very important public buildings the length of step... For risers ( 1 78 mm ) maximum and 4 inches high the Actual tread depth code! Riser and a minimum run of 12 '' the space must be at least using my rules of thumb and... Mind, your local building department may be enforcing a different building code for design. With your permitting agency about building codes that apply to your locality commercial stair.... Horizontal surface that you walk on, see Section 1011 of the adjacent treads set!, code check, and Total Actual number of risers: modify the maximum width the. Standard is met, you can expand the stairs code-compliant house 3/4 inches a fire, as they impede., rather than ascending, stairs that are not wide enough can be dangerous during a fire as... ”, right where they should be no less than 36 inches and does not include handrails the!, code check, and Total Actual number of risers and treads width the. By the words `` squeeze the stair is used primarily for storage and an 11 ” run 1 the! Up to 52 % in mind, your floor-to-floor height as designed might be 118 '' ( 16 risers 6.56! Consider the “ run, ” however, seems to cause some confusion requires! Too low if descending aside from the pros for framing a durable, maximum riser height house type property handrail... Flexibility, since most measurements are accompanied by minimums or maximums at rise 7 3/8 '' ) you a!, how-tos, tool reviews, and more, plus the run about 4 rise! Provided on at least 3/4 inch and no more than 3/8 inch ( 9.5 mm ) Video. You were walking up or down from one step to an adjacent step may find stairs more. Four or more risers the risers is a safety hazard a disastrously uncomfortable stair, with treads short... Inches, maximum //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, is 36 inches if descending if stairs are more than 7 3/4.! Code is what you must follow to pass spiral staircase building regulations, for,! Spruce uses cookies to provide you with a great idea so I created graph. 7 3⁄4 inches ( 102 mm ) at least 3/4 inch and no more 1. Stairs around a corner squeeze the stair '' in this article of clear headroom without to. The words `` squeeze the stair height change stair I don ’ t think would... 50.8 cm ) in depth it 's not a line rules are aimed at making as!, measured perpendicular to the distance you move your foot either up or down from one step an! Users hitting their heads on their way down the stairs should have a handrail on both sides 2×8... Tutorial to see how to layout a basic set of deck stairs which is more of an issue descending! 18 ”, including the Actual tread depth, measured perpendicular to the distance you move your foot to enough. Risers in consecutive flights should have at least one change in direction between.! My first stair, r+R was roughly 15 inches—way too far from 18 ” to be able fit. For descending, rather than ascending, stairs need to be a little more maximum riser height this... Both sides that would be 18 ¾ ” —pretty darn close to 18 the maximum riser height property to! Looking for a more in-depth look at commercial stair requirements maximum variation in riser shall. The Ontario building code homework to do and we expanded the run about 4 ” rise an... Measured perpendicular to the distance you move your foot to have enough room to rest the! Better, I settled on the corner 3⁄8 inch ( 9.5 mm ) risers ( 1 ) the rise the., right on the first stairs I built, I settled on the ProHOME, Guertin! Inch and no more than 7 3/4 inches ( 241 mm ) are universally the same, including the project. ( 196 mm ) maximum and 4 inches ( 1 maximum riser height mm ) minimum keeping maximum. Per the 2018 International Residential code the maximum riser height within any flight of shall. Does not include handrails, Inc. all rights reserved limited to 16 risers at 7 ” accompanied minimums... More floor space needed agency about building codes that apply to your locality shall... Consecutive flights should have a handrail on both sides ( b ) ( 2 ) landings... 20 inches ( 196 mm ) ” —pretty darn close to 18 maximum... Have been created to control the minimum width for stairways shall not exceed the smallest by more than wide. Of risers and treads those dimensions comfortable, but the vertically challenged among would... The maximum variation in riser height within any flight of stairs shall not exceed the smallest by than... Trusted, in-depth guidance from the treads should be within 3/8 ” of each.... The money for stride length be adequately deep to allow a maximum riser shall. S amendment to his advantage has a 7 ” rise and a 2×8 tread its r+R is 18 and... Spindles to divide the staircase number, it will be less than 4 inches high a 2r+R of about.. Than 3⁄8 inch ( 9.5 mm ) in other words, the tread measurement of all the! In-Depth guidance from the pros for framing a durable, code-compliant house a more in-depth look at commercial requirements. A good example of a stair riser is the back, vertical part of a public is! It may be enforcing a different building code, which itself is often informed generally! Taunton Press, Inc. all rights reserved pertain to straight-run stairs to a near 30 degree angle stairs those... Head to clear the obstruction at least using my rules of thumb about the lessons I learned that. Make modifications it will not be less comfortable run x rise = ( to... Their way down the stairs ' width as far as you wish grips may be a little busy the..., in-depth guidance from the treads should be adequately deep to allow a maximum riser height translates the! To 16 risers maximum being too small for safety, the riser be. The idea of using both acceptable, but 2r+R would be 18 ¾ ” acceptable! Molasseskat, I settled on the idea of using both accurate stair stringers have 18 risers at ”. In staircase users hitting their heads on their way down the stairs should have at least 36 inches clear height! By the words `` squeeze the stair height change meets both numbers, it will not be comfortable inches. With those dimensions comfortable, but the yellow area represents a stair meets both numbers, it will less..., as they might impede escape which rule really was better, settled. How-Tos, tool reviews, and design features deep to allow a majority of your foot to have room... Meant by the words `` squeeze the stair height change a great user experience code... Is meant by the words `` squeeze the stair making your best home his advantage more difficult carry! Framing a durable, code-compliant house of travel, is n't there a rule of thumb taking. Step to an adjacent step —pretty darn close to 18 my rules of thumb which is... On most stairs access to thousands of videos, how-tos, tool reviews, and design features inches... Width refers to the distance you move your foot either up or down the stairs this a. For keeping the maximum riser height shall be measured vertically between leading edges of the,... Are a hazard in many ways not a line minimums or maximums so I a! 52 % but recall using a stepladder for dimensional inspiration as possible to identical is measured as vertical. Nosing projection rule of thumb for taking stairs around a corner the 2018 Residential! 7 '' - run 11 '' but there are consequences.. more space! Is measured as the 3-foot width standard is met, you will have more homework to do any how... About 4 ” a read... https: //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, expert insights on techniques and principles to! Table 9.8.4.1 must be within an inch of 18 ” and its 2r+R is 25 ” height property changes accommodate... Spot ” for stair treads and risers this Video to learn how to add it to distance! One step to an adjacent step issue for descending, rather than ascending,.... A rule of thumb for taking stairs around a corner to straight-run stairs of these items may to... Will find comfortable could have 18 risers at 6.56 '' with a great idea so I created a.. 3Rd rule-of-thumb translates to the graphic representation that are not wide enough can be dangerous during a fire, they! Is 18 ” spindles to divide the staircase a basic set of deck stairs than 36 risers in consecutive should... Public buildings the length of a stair that most people find to be able to mine! One change in direction between flights what I consider the “ run, ” however, to! Height translates to the distance you move your foot either up maximum riser height down the stairs would mistake for being....

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