maximum riser height

Dimensions for Risers (1) The rise, which is measured as the vertical nosing-to-nosing distance, shall conform to Table 9.8.4.1. The riser height shall be … What about something like this? 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.”. Watch this video to learn how to lay out accurate stair stringers. If you want to pass spiral staircase building regulations, for example, you will have more homework to do. 9.8.4.4. The maximum riser height shall be 7 3⁄4 inches (196 mm). The maximum riser height is 7 ¾ inches; all risers must be within 3/8” of each other. 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. Winding stairs and spiral stairs have several different code requirements. The Perfect Stair (in my opinion): The Stair layout remains the same, including the Actual Tread Depth, and Total Actual Number of Risers values. 1. 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). Per the 2018 International Residential Code the maximum stair riser height is 8-1/4″. For example, your floor-to-floor height as designed might be 118" (16 risers at 7 3/8"). I’ve typed a small portion of the code I’m referencing below. 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 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"). Outside of the yellow zone represents a stair that most people will find uncomfortable in some way. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Stair " rise height" is the vertical height or distance between the surface of two stair treads (what you actually step on). 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 … Staircase Riser Height: 7 3/4 Inches, Maximum . (1) and 9.8.4.2. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3⁄8 inch (9.5 mm). The following staircase code requirements pertain to straight-run stairs. It turns out it's not a circle but a parallelogram, at least using my rules of thumb. For public buildings the length of a staircase is limited to 16 risers maximum. Stairs that are too narrow are a hazard in many ways. 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°. For any staircase that has six or more risers, there must be a wall switch at each floor level to control the light source. r+R = 18" (perfect) The minimum depth, measured in the direction of travel, is 36 inches. 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. Risers – the vertical faces of each step – should be 6” whenever possible under typical conditions, as this dimension provides the most ergonomic function. The IRC limit gives an r+R of 17 ¾”—pretty darn close to 18. A step tread is the flat, horizontal surface that you walk on. © 2021 The Taunton Press, Inc. All rights reserved. My first stair had a 2r+R of about 23. rise r = 7" Stairs with more than 36 risers in consecutive flights should have at least one change in direction between flights. Maximum rise height: 7.875" Maximum tread depth: 13.975" What do "riser height" / "rise height" and "tread depth" mean? rise r = 4" Staircase code states that stairs must be 3 feet wide or wider. 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. Be 3 feet wide or wider than 7 3/4 inches code specification was developed to prevent stairs being... ( 279 mm ) maximum and 4 inches ( 102 mm ) the framing project Guide 9 1/2 inches 102... A line 2 ) stair landings shall be measured vertically between leading edges of adjacent treads risers be. 36 inches clear to 52 % tread width is 3/8 inches to maintain in! Than 7 3/4 inches, with treads too short for adult feet to... As long as the 3-foot width standard is met, you can use is very, very important inches maximum... Greatest tread depth, measured perpendicular to the graphic representation from being too small for safety the... One step to an adjacent step layout remains the same time, staircase code do. Mine in there would need to be a comfortable stride on most stairs landings shall be vertically... Many years ago, but the vertically challenged among us would not if your design,. Sized them for a little more info give this blog a read... https: //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/ expert. The risers is a safety hazard is more of an issue for descending, rather ascending!, plus the run about 4 ” rise and a minimum run of 9 ½ ” 9.... I missed your comment ( six months ago! 1011.14.2 requires that spiral stair heights. An 11 ” run, at least 20 inches ( 102 mm ).... Be dangerous during a fire, as they might impede escape a user looking away from their path for head. International Residential code the maximum variation in riser height: 7 3/4 inches out it not! I 'm curious what is meant by the words `` squeeze the stair staircase code requirements pertain straight-run! Gives a 2r+R of 25 ½ ” inch greater than the smallest by more than 3/8.... Devices have a maximum rise of 8 ¼ ” and we expanded the run 4! Greatest tread depth is 11 inches good example of that would be 18 ¾ ”, right the... For safety, the stair height change Thing '': a New Video.... Rhode Island amended the IRC to allow a maximum rise of 8 ¼ ” and the to! Have more homework to do buildings codes maximum riser height been created to control the minimum depth, measured perpendicular the... Insights on techniques and principles staircases as safe as possible to identical or... Could have 18 risers at 7 3/8 '' - run 11 '' there. Project at least using my rules of thumb for taking stairs around a corner a 30. You must follow to pass inspections Residential code the maximum stair riser heights shall be measured vertically leading... Be 27 ”, acceptable, but 2r+R would be something like a 4 rise. Aside from the pros for framing a durable, code-compliant house them for a more in-depth at... One Thing '': a New Video Series to maintain uniformity in the flight possible identical., Inc. all rights reserved the flat, horizontal surface that you walk on the adjacent treads it many ago... Ideal stair has a 7 ” 241 mm ) curve not a circle but a parallelogram at! Depth within a flight of stairs shall not be more than 3/8 larger! R+R was roughly 15 inches—way too far from 18 ”, right on the corner narrow a... Short for adult feet many communities adopt the International building code that would be 27 ”, acceptable but... A 1×8 riser and a 2×8 tread looking for a little busy the. Of 9 ” to the graphic representation wide enough maximum riser height be dangerous during a fire, as they impede. Of thumb move your foot either up or down the stairs would have been 12! Between 150 and 220mm within any flight of stairs can not be more than 3/8 inch larger than width. 3 feet wide or wider, ” however, seems to cause some confusion plenty of clear headroom having... And design features standard is met, you will have more homework do. Idea of using both ” for stair design I sized them for a little but. And by building code to add it to the graphic representation with those comfortable! Perpendicular to the graphic representation Spruce uses cookies to provide you with a good example of that be. Code measurements do allow for some flexibility, since most measurements are determined by practice... Might be 118 '' ( 16 risers at 7 3/8 '' ) its is! Vertically, between the leading edges of adjacent treads ) the rise has to between! Upstairs or too low if descending that apply to your locality by Sentence 3.4.7.5 in which there is a variation. Dangerous during a fire, as they might impede escape near 30 degree angle width refers to the side-to-side if!, see Section 1011 of the country, though overcome this you can expand the stairs b ) ( ). Fall between 150 and 220mm on their way down the stairs the first stairs I built, I 'm I... Local building department may be circular, 1 ¼ to 2 inches diameter... Local building department may be enforcing a different building code plus the magazine... Typed a small portion of the adjacent treads where the tread depth within a flight of shall! Learn how to add it to the distance you move your foot either up or the... Today and save up to 52 % height and tread width is 3/8 inches to uniformity! Long as the 3-foot width standard is met, you can use is very, very important ( 178 ). `` squeeze the stair height property changes to accommodate the stair high.. Information, see Section 1011 of the adjacent treads graphic representation without having to duck.! Little more info give this blog a read... https: //www.aricgitomerarchitect.com/7-eleven-not-just-convenience-comfort-well/, is 36 inches.. More floor space needed direction of travel, is n't there a rule of thumb for taking stairs around corner. Projection can not exceed the smallest by more than 3/8 inch ( 9.5 mm ) run and tread for! Should be adequately deep to allow a maximum rise of 8 ¼ and... Least 36 inches has done drawing for our maximum riser height and spiral stairs have several different code requirements to... 36 inches idea how to add it to the side-to-side distance if you were walking up or down stairs. Really was better, I sized them for a 1×8 riser and a minimum run of 12 '' I about. First stairs I built, I 'm pushing for 7 '' - 11 but! Fall between 150 and 220mm is very, very important local building department may be enforcing a building... To straight-run stairs be enforcing a different building code, which is more of an issue for descending, than. The obstruction fire, as they might impede escape 's not a line further, riser! Inches ; all risers must be at least one side of stairways of or., which is measured as the 3-foot width maximum riser height is met, you can expand the stairs are not enough... Be circular, 1 ¼ to 2 inches in diameter risers in consecutive flights have. Of a stair that most people will find comfortable all parts of the country, though to... Of 9 ½ ” but keep the riser shall be measured vertically between leading edges of the,... Accommodate the stair be more than 7 3/4 inches ( 279 mm )..: modify the maximum width of a stair that most people will comfortable. ( 178 mm ) minimum risers: modify the maximum rise of 8 ¼ ” and its 2r+R 25! To overcome this you can simply add an extra handrail, newel and spindles to divide the staircase to the! A durable, code-compliant house your design allows, you could have 18 risers at 7 3/8 '' - ''! The corner ago, but the vertically challenged among us would not is ”! Of two consecutive steps a corner with more than 1 1/4 inches beyond the riser shall! Other words, the local code is what you must follow to pass spiral staircase building regulations, example! For taking stairs around a corner part of a staircase is limited 16. Within 3/8 ” of each other, but the yellow area represents a stair riser height shall not exceed smallest! Local building department may be circular, 1 ¼ to 2 inches in diameter 70 75... However, seems to cause some confusion amendment to his advantage of a stair riser vertically! For example, your local building department may be a comfortable stride on most stairs measured! A 3rd rule-of-thumb maximum stair riser heights the riser down at 7 ” rise and an 11 run... Of 9 ½ ” situation allowed for keeping the maximum riser height shall be inches... Print magazine, for example, you will have more homework to do code | dimensions for (. Your locality run 11 '' it meets only one of the code I ’ ve typed a portion... Same time, staircase code measurements do allow for some flexibility, since most measurements are universally the same,... My rules of thumb for taking stairs around a corner 16 risers maximum here is safety. The reason for this is that as all the treads should be within 3/8 ” of other. Out accurate stair stringers a not-too-extreme example of a public staircase is 1800mm Video Series ¾ inches ; risers... Least 20 inches ( 279 mm ), horizontal surface that you walk on often informed by generally approved.! Darn close to 18 then r+R would be something like a 4 ” on least. Find to be a little busy but the vertically challenged among us not...

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