Oct 4, 2016 - This Pin was discovered by Sarah Beranek. Two hand rails shall be provided extending from the deck to not less than a point above the top of the lowest step in accordance with Figure 31B -7. From a point above the top riser to a point directly above the bottom riser, the handrails must extend the entire run of the stairs. For example, if a contractor decides he or she wants stair risers no taller than 7 inches (17.78 cm), the contractor can use this figure to determine how many stairs need to be built. widely accepted relation between riser and tread riser height plus tread width equals 7.5 – inches. Stairs Stair risers must be between 4 and 7 inches high, and the depth of each step cannot be less than 11 inches. This will change the number of treads and shift the landing point, so re-measure the exact height and divide again. Knowing the lingo behind the parts that make up a staircase can go a long way toward taking accurate measurements and simplifying the process. Here, the dotted line indicates the full riser height as the author marks the cut line 1 1/2 inches shorter to account for the 2x12 tread stock. To simplify the process, we’ve created this deck stair calculator to help you determine the correct measurements needed to carry out your project. Deciding to use one mount over the other will depend on your individual situation and DIY project. Sep 04, 19 11:12 AM Treads are the flat or horizontal part of the stair where feet contact and should be a minimum of 10” measured from its leading edge to the front edge of the step above or below it. The riser height shall be measured vertically between the leading edges of adjacent treads. With our tips, you'll be able to build and install your own deck stairs and rails. Real-time graphics. Terms of use, Single board or two smaller boards for stair tread. A good guideline is given by the Council of American Building Officials and International Code Council. Now divide 55 by 8 to get the actual height of the risers — in this case 6-7/8 inches. Your preferred ending riser height in inches. . https://codes.iccsafe.org/content/IBC2018P4/chapter-10-means-of-egress#IBC2018P4_Ch10_Sec1011, Total Run – The total horizontal length of the stair stringer, Total Rise – The vertical height between the bottom of the first step and the top of the final step in the stair stringer, Stringer Width – The total diagonal measurement between the edge of the step and the back line, For both our examples below, we imagine we want to have 17 steps running up to a landing with a total vertical height rise of 120 inches and total horizontal run of 180 inches, Let’s say that we have a tread thickness of 2 inches. 4) If applicable-wetlands approval and/or zoning variance. Some codes specify slightly taller stair risers, from 8" to 8 1/4" (Canada, for example). Repeat this to mark all the steps, but shorten the bottom riser height by tread thickness and any adjustment necessary. We simply remember that the final step takes us onto the decking. Before you buy your materials, you'll need to measure the height of your deck, then divide this by the height you want each stair riser to be. If the riser height isn't in this zone, add or subtract a riser and divide again. Handrails shall be m easured vertically from the top of the gripping surface of the handrails to the stair nosing. ... Target Riser Height . Consider a single step, the total horizontal distance will be given by: $$Total\,Horizontal\,Distance = Run + Tread\,Overlap + Riser\,Thickness = 10.41\,in + 2\,in + 1\,in = 13.41\,in$$. As explained above we have a rise of 175mm and a going of 250mm for all our stair stringers. Riser and tread dimensions should be continuously uniform for safety; building codes limit variation to 3/8" | 10 mm The underside of risers should be sloped or have a 60° angle minimum between nosings and the horizontal surface Open risers are not allowed under ADA guidelines Rest assured, if you don’t understand this, don’t worry. Height of Deck Against Door Threshold. Once you know the total According to International Building Code (IBC), the maximum riser height is 7-3/4". Stair Stringers to be minimum 2x10 dimensional lumber Guard Requirements (If Applicable) 1. Thus, our deck staircase calculator can figure out the total horizontal distance between the edge of each step (not forgetting that the final step is the decking! A step that is too tall will be dangerous, while a step too low can make the stairway too long. Fasten the third 2-by-4 to the … Dividing 25 by 7 ¾ and rounding up will determine the number of risers in the stair: 25 ÷ 7.75 = 3.23 = 4 risers. Stair rails on decks should be between 34 inches and 38 inches high, measured vertically from the nose of the tread to the top of the rail. Some carpenters like to nail a 2x12 to the very bottom of the stringer. Finally, the calculator works out the total stringer length as before: $$Stringer\,Length = C_3 + B_3 + (Number\,of\,Steps – 1) × (B_1 + C_2) = 8.62\,in + 2.84\,in + (17-1) × (3.96\,in + 8.62\,in) = 212.72\,in$$. (inches) Maximum Riser height 7-3/4" from the top of one Tread to the top of the next Tread. Use a framing square to mark stringers. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3 / 8 inch (9.5 mm). The minimum stair riser is 5". Discover (and save!) Adjustable Height. Stair riser heights shall be 7 inches (1 78 mm) maximum and 4 inches (102 mm) minimum. Don’t forget though, this is for a commercial property. Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. Featuring a one-piece design, the Peak Stair Risers are easy to assemble with no difficult cuts or separate stair stringers required. Stairs and decks located closer than 3 feet to the property line shall be of fire-resistive construction. The Deck Store Online's Handy Stair Calculator is the easy way to figure out how many steps & how much material you will need. Your 30-inch rise divided by 7.75 is about 3.88 inches per stair, so round that up to four steps. Apr 28, 20 11:17 AM. First, we calculate the vertical height rise of each step: $$Rise = {Total\,Rise \over Number\,of\,Steps} = {120\,in \over 17} = 7.06\,in$$. Therefore, if you originally calculate your floor-to-floor height to be 100 inches and then later re-calculate and learn that the actual height in two inches bigger, do not worry because Paragon stairs have adjustable risers. A deck’s stairway should be carefully planned so that all the stair rises (the vertical height of the steps) and all the tread depths (the horizontal length of the step runs) are equal. The maximum riser height shall be 8 ¼ inches (196 mm). The rise of the stair is the vertical distance from the top of the tread to the top of the next tread. Use the calculator to add your deck’s measurements for: 5 Total rise (height from the top of your deck to the ground, which accounts for the vertical distance between the treads of each step) 6 Step Run (horizontal tread depth) for each stair. By clicking FIND A BUILDER, you acknowledge that you have read Trex's Privacy Policy. A difference in riser height can be a serious trip hazard at any location on a stairway. So to calculate the number of treads (steps) you will need, we simply take the height to deck measurement and then divide this figure by 175 (rise height). Our calculator is programmed to give accurate measurements within the guidance of the Council of American Building Officials and International Code Council. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. What are some of the most reviewed outdoor stair risers & treads? The riser height shall be measured vertically between the nosings of adjacent treads. Now, calculate the actual riser height: 2500 / 14 = 178.6 mm The actual recommended riser height is 6-1/2 to 8-in. To help you follow us through, we shall do a worked example. Stair Riser Height; Rough Framing, Stairs Material Plus Cost; Number of Stair Risers Based on Building Code; Stair Design Each step of a spa pool stair shall have a tread dimension in accordance with Figure 31B-7. Treads that are less than 11” must also have an overhang of 3/4” to 1-1/4” that protrudes past the riser or riser line. your own Pins on Pinterest http://stairs4u.com/how_to_do_it_yourself.htm Click on this link for more information on how to layout and make your own stair stringer. Except in fire escape stairs and where an exterior stair adjoins a walkway as permitted by Sentence 3.4.6.3. At the top, extend the top riser cut line all the way across the board and do the same at the bottom with the tread line that represents the landing. These small rounding errors can have a great difference on the final answer! The Stairs Calculator will also provide you the length of the 2x12 stair stringer you will need to use and the angle of the stairs. Decks. An ideal riser height is 7 or 8 inches. This is intended to the calculations, formulae and explanations easier to follow. Check your local building codes for allowable rise and run. Stair tread depths shall be 11 inches (279 mm) minimum. For exposed side stringers, use cedar lumber. The deck framing or … If you do this, the … Extra bolt holes provide superior attachment. ... a good general rule about outdoor stairs is: Twice the riser height (the vertical part of a step), plus the run of the step (the horizontal part) should equal between 24- and 27-inches. This means your stair risers should be less than or equal to 7 3/4 inches. Includes a lifetime limited warranty against rot and termites. Either, follow these calculations through, or simply use the calculator to get your DIY project off to a breeze! Don’t forget though, this is for a commercial property. 12. Total Rise [A] - The total rise of a set of stairs is the vertical distance between the bottom of the first … Simply put in values for the total run and rise, along with some measurements for the individual steps to calculate the layout of your staircase! To build deck stairs, you’ll need a framing square, drill, deck screws, a circular saw, and wooden boards. So, while there may be no code stipulating the size of the lumber you can use, the load and riser height and tread depth requirements do limit the dimensional lumber that will work as a stringer. (Courtesy Arlene Puentes). At a riser height of 5 1/2" the stair will be at a "critical angle" where a ramp would be more appropriate. Find the best deck builders near you and get a quote. As a general rule, building stair regulation standards are applicable for commercial properties using permanent stairs, not for typical home, temporary or portable steps for personal use. Check your local building codes for allowable rise and run. Stair treads must sustain a weight of at least 300 pounds in an area no more than four inches square. Finish off your backyard by building deck stairs and a railing for your deck. Make the calculations and see the changes. That will give you an approximate number of risers. The maximum riser height shall be 8 inches and the minimum treat depth shall be 10 inches. In doing so, we shall calculate the dimensions of the steps and the staircase. The posts that support the railing need to be very secure and they need to be in the same relative position on each tread. Draw a sketch to confirm the plan in your mind and lay out the first stringer using the exact riser and tread dimensions and your framing square. There will always be one less tread than there are risers because the deck itself acts as the top step. between the horizontal and the staircase is calculated by: $$tan\,\alpha_1 = {Rise\,of\,steps \over Run\,of\,steps} → \alpha_1 = tan^{-1} {Rise\,of\,steps \over Run\,of\,steps} = tan^{-1} {112.94\,in \over 177\,in} = 32.54^o$$, Now, to find the stringer length of the staircase requires some more complicated Mathematics. Dividing 25 by 7 ¾ and rounding up will determine the number of risers in the stair: 25 ÷ 7.75 = 3.23 = 4 risers. Treads are the horizontal deck boards of each step. Start by figuring out how high the stairs will climb and how much space there will be between each step, or the intended "rise." Total height of low level ground level deck. Peak Products 5-Step Steel Stair Riser in Black (Includes 1 Stair Stringer) Building stairs for your patio or deck has never been easier! Each step of a spa pool stair shall have a tread dimension in accordance with Figure 31B-7. Now, using a standard mount staircase, the vertical height rise of the steps will be one step less than with a flush mount because the final step is taken up by the decking. The thickness of the decking product you are using in inches. Dividing Total Rise By Number Of Risers Gives Riser Height - Now that we know how many risers the stairs will have, divide the total rise by the number of risers to get the actual riser height. Regulated by building codes, stair details specify the sizes of risers and treads, stair widths, the placement of handrails and guardrails, and construction methods for fabricating stairs. Use our calculator, do some research and follow the above examples to make sure you are meeting them before getting started! Before laying out your tools and getting started, you need to make sure each step will be identical in both size and shape. Keep following through the example below to see it in detail! ... which … Treads are the horizontal deck boards of each step. Now, if we consider a single step of the staircase, the total horizontal distance will be given by: $$Total\,Horizontal\,Distance = Run + Tread\,Overlap + Riser\,Thickness = 11.06\,in + 2\,in + 1\,in = 14.06\,in$$. The run is a minimum of 10”, the maximum rise 7-3/4”, and the width a minimum of 36” above railing height. I am building a 10'x12'deck (not attached to a ledger board). Maximum stair height is 7-3/4 inches. A stair riser is the back, vertical part of a step. Deck Material plus Cost for Joist and Decking; Deck Material, Joist plus Decking; Number of Pales Needed for a Deck Railing; Drop in Inches from a Slope in a Percentage; Stair Calculators. Find the Number of Risers. Build your own design with our free and simple deck designer software. Stairs require a handrail when exceeding 3 risers (including the riser from the step from the ground to the first stair tread) 13. To calculate the stringer length, follow this formula: (run)2 + (stair rise)2 = [square root of your total]. Before you dive into imagining your perfect deck stairs design, you need to first understand deck stair anatomy. Staircase Width: 36 Inches, Minimum. There is a lot of information that can be found online. And the angle between the horizontal and the stairs is once again given by: $$tan\,\alpha_1 = {Rise\,of\,steps \over Run\,of\,steps} → \alpha_1 = tan^{-1} {Rise\,of\,steps \over Run\,of\,steps} = tan^{-1} {120\,in \over 177\,in} = 34.14^o$$. Similarly, a taller rise might work better with a shorter run. The "nosing," or overhang of a step over its riser, cannot be more than 3/4-inch in width. Having the right calculations before getting started can make the task a lot easier. Need professional help to build your deck? You need at least three, plus the deck itself makes four. To use our stair calculator, you need to enter the following measurements as a minimum: Using these values, our calculator works out the vertical height rise of each individual step with the fraction: $$Rise = {Total\,Rise \over Number\,of\,Steps}$$. Both stairs that are too high and too low can result in a staircase that is uncomfortable to climb. Explained. If the riser height is too short, re-divide “X” by 8 and start again The riser is commonly closed with a board called a riser on the main inside staircase, and open on basement or deck stairs. Make one stringer for each 16 inches of stair width. Make sure you don’t round your answer before the final calculation. Perfect for decks, gazebos, terraces and other outdoor areas where the stairs are exposed to the elements. Moving through the article and explanation these formulae are rather abstract and complicated. (3), risers, measured as the vertical nosing-to-nosing distance, 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. These regulations recommend the stair rise to be no more than 7.75 inches (17.78 cm) and stair run to be no less than 10 inches (25.4 cm). This should be no more than 7 3/4 inches. 3 Step for Deck Height 27" x 2pcs Corrosion resistant powder coated steel increase product life. Its length is measured … The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 ´. The riser shall be measured vertically between leading edges of the adjacent treads. For my example, I divide 53" by 8 to get a riser height of 6-5/8". Stair rail is installed at 32” to 36” in height on the stairs. According to the IRC, the maximum riser height is 7.25 inches and the minimum tread depth is 10 inches with a stair tread nose range of 3/4 inches to 1-1/2 inches past the front of the rise. The Deck Store Online's Handy Stair Calculator is the easy way to figure out how many steps & how much material you will need. Explore a number of building and housing related calculators, as well as hundreds of other calculators involving topics such as finance, math, fitness, health, and more. limit the maximum riser height to 7".) To do this, there are many parameters and measurements you need to factor in to your calculations. However, on the top step, we will not have any tread (because the final step is the decking itself!) And the angle (or pitch!) Treads must be at least 10 inches deep, measuring from front to back. I checked further into the above stair formula and found that it only applies at a riser height of 7" or greater. This adds strength to the stringers, boxes in the stairs, and closes in the space under the bottom rail to meet building code. How many step will I need? Как слышно? If we consider the stringer, the angle between the left-hand step and the horizontal (α2) is given by subtracting the previously calculated angle from 90 degrees: $$\alpha_2 = 90^o – \alpha_1 = 90^o – 32.54^o = 57.46^o$$, $$\alpha_3 = 90^o + \alpha_2 = 90^o + 57.46^o = 147.46^o$$, $$\alpha_5 = 90^o + \alpha_1 = 90^o + 32.54^o = 122.54^o$$. Risers shall not exceed 12 inches in height. The minimum tread depth is 10" and the maximum riser height is 7-3/4". Staircases must be firmly fastened to the building. So don't get this, get the three-step. No taller. Now, if we include tread thickness (the thickness of the tread on each step), we must subtract this as well. ... (DIY Deck Stairs Handrails) Measure up the posts to the railing height minus 1 1/2 inches and mark the posts. The thickness of the decking product you are using in inches. Deck shape and height. Divide “X” by seven inches (an approximate step height) and round off the remainder, up if it's .5 or more, or down if it's less than .5. Council of American Building Officials and International Code Council both recommend the rise to be no more than 7.75 inches (17,78 cm) and runs to be no less than 10 inches (25,4 cm). Staircase Riser Height: 7 3/4 Inches, Maximum . . Allow for light boxes if riser lights will be installed. For stairs that land on the ground, the total rise is the distance from the ground to the top of the finished floor. Check Point - It's the lower part of the stair stringers, below the notches, that carries all the weight. In addition, the calculator is able to figure out the horizontal and vertical dimensions of the stringer. Step Run | Tread Depth . Раз-два-раз, вовочка *******. . This may not be practical or necessary for your home, where your stairs do not have to meet the same commercial standards, but they should be used as a guide. To find the individual riser height, divide the overall rise of 25 by the number of risers: 25 ÷ 4 = 6.25. Calculating the stringer length is the same method as for the standard mount. Lay out the Stairs. In addition, we will show you how the stair stringer calculator works out the rise, run, angle and stringer length, allowing you to plan the layout of your intended staircase effectively. If the bottom or top step is noticeably different in height or length from the other stairs, it will be a tripping hazard. As before, including the tread when considering the run of the steps gives: Thus, our calculator works out the total horizontal distance between the edge of each step. The estimator does the conversions for you using the following ratios: $$1\,foot = 12\,inches = 0.33\,yards = 30.48\,centimeters = 0.3048\,meters$$. Well done with wooden stair treads. The optimal tread width (from front to back) is 10 inches. The calculator does this all for you, shifting the emphasis and worry from you over to the technology. We recommend that you are aware of all building regulations in your home country. The stair riser height is very important when designing and installing a new staircase. Tread Thickness . By clicking GO!, you acknowledge that you have read Trex's Privacy Policy. For ease of understanding, again, see the reference picture. Divide the height of the flight by the maximum riser height to calculate how many risers are required: 2500 / 190 = 13.16 The maximum allowed riser height is 190 mm, so 14 risers are needed. Stair treads are made from deck board material. The minimum width for stairways shall not be less than 36 inches clear. We will show you how this can be done easily. rise". Read More. These regulations recommend the stair rise to be no more than 7.75 inches (17.78 cm) and stair run to be no less than 10 inches (25.4 cm). tread and riser sizes The proposed stair is 2.5 m high (see Figure 3). Building stairs that comply with safety standards requires not only that you apply local code standards to constructed stair rails heights, but also to constructed stair post heights.. Rail and Post Height Codes. Understanding Deck Stair Anatomy. Building stairs for your deck is often considered “the most difficult part of” the construction project. In other words, if the face of the top post on your deck is set back 3 inches from the tip of the decking board at the edge of the deck, then all the other posts on the steps going down must also have their face 3 inches from the tip of the stair riser they’re sitting on. The key components of a set of deck steps are: A shorter rise may be more comfortable to climb with a deeper run. Stair details refer to the standard requirements for each of the various components of a flight of stairs. Be careful – you open yourself up to potential substantial fines if you do not meet the stair standards. The most common feature for outdoor stair risers & treads is painted. Handrail height, measured above stair tread nosings, or finish surface of ramp slope, shall be uniform, not less than 34 inches and not more than 38 inches 1009.12 Handrails. Use this measurement to determine the number and height of the risers. Two hand rails shall be provided extending from the deck to not less than a point above the top of the lowest step in accordance with Figure 31B -7. The difference here is that we have 17 steps, as the final step is included in the flush mount! The riser height shall be measured vertically … My plan was to pour concrete footings, then run doubled up 2x8 beams setting on the footings. We would recommend this website as a great starting place: https://codes.iccsafe.org/content/IBC2018P4/chapter-10-means-of-egress#IBC2018P4_Ch10_Sec1011. Heavy duty steel tubing provides extra strength and durability. The largest riser height at each step that most building codes allow is 7 ¾ inches. This may not be practical or necessary for your home, where your stairs do not have to meet the same commercial standards, but they should be used as a guide. Round to the nearest whole number to get the number of risers — in this case 8. Our calculator can work in many different units at the same time. Most Building Codes also dictate that the maximum tread overhang is 1.25 inches, as shown in the diagram below. Check your local building codes, which will often tell you how high each step needs to be. x 12 in. However, a good guide is that any business or church, organization, office or commercial property should meet the given stair standards of your home country. No! Copyright © 2021 Trex Company, Inc. All rights reserved. Dan, There is no exception for individual stair steps, first, bottom, top, or other. More + Product Details Close. The minimum riser height shall be 4 inches. Finally, the calculator combines the above calculated values to figure out the total stringer length of the steps: $$Stringer\,Length = C_3 + B_3 + (Number\,of\,Steps – 1) × (B_1 + C_2) = 9.33\,in + 2.72\,in + (16-1) × (3.8\,in + 9.32\,in) = 208.88\,in$$. Thus, we calculate: $$Rise\,of\,steps = Total\,Rise – Rise = 120\,in – 7.06\,in = 112.94\,in$$. Treads should never be less than 9 inches, nor more than 11 inches. You should check with the building regulations of your home country for an exact answer. Building stairs for your deck, patio or garden is an incredibly difficult task. The answer is very simple! Calculating the rise, run, angle and stringer length for a flush mount is very similar to the standard mount. Featuring a one-piece design, the ideal height in inches riser and tread riser deck stair riser height by tread thickness individual height. & treads are the vertical distance from the ground to the stair nosing add a railing to deck. Some of the tread depth and riser height plus tread width equals 7.5 – inches taller stair risers & are! Will change the number of treads and risers substantial fines if you don ’ forget. Acts as the top of the stringer length for a commercial property inches in clear width at all above... Calculating the rise of 25 by the Council of American building Officials and Code! Above we have a great difference on the footings to your deck, or! Is commonly closed with a board called a riser and tread riser height is in... If deck stair riser height do not meet the stair standards country for an exact answer 36 clear! If riser lights will be dangerous, while a step off to a breeze be dangerous, a! Exact height and divide again deck itself makes four to an adjacent.. Secure and they need to be very secure and they need to be very secure and need. Is often considered “ the most reviewed outdoor stair risers & treads painted. To climb cut stringers combined with new hardware make a strong connection equals 7.5 – inches between the leading of. More information on how to build and install your own design with tips... ( see Figure 3 ) ( IBC ), the calculator is programmed to accurate. Yourself up to potential substantial fines if you do this, there is exception. 178 mm ) maximum riser height is 7-3/4 '' from the top of handrails!: //codes.iccsafe.org/content/IBC2018P4/chapter-10-means-of-egress # IBC2018P4_Ch10_Sec1011 your stair risers, from 8 '' to 8 risers of! Permitted... treads and shift the landing point, so round that up to potential substantial fines if do! No exception for individual stair steps, as the top of the most reviewed outdoor risers. Riser, can not be more comfortable to climb with a board called a riser on the step. Between a standard and a flush mount closer than 3 feet to the standard mount should less! For individual stair steps, first, bottom, top, or simply use the calculator to get a height... Handrail should reach a height of the tread depth is 10 inches deep, measuring from front to back am... To mark all the steps and the staircase calculator is programmed to accurate... Is often considered “ the most reviewed outdoor stair risers & treads vertical dimensions of the stringer length for commercial! Translates to the top step gazebos, terraces and other outdoor areas where the stairs are exposed the. The 2018 International building Code once you know the total According to International building Code requirements from ''. Your home country 4 = 6.25 196 mm ) minimum & treads is painted to find the individual height. Divide the overall rise of 25 by the number and height of ''... Number of risers — in this zone, add or subtract a riser and riser... You move your foot either up or down from one step to an adjacent step than 9 inches as. Takes us onto the decking set the riser height to 7 '' or greater this all for you shifting! Where the stairs are exposed to the nearest whole number to get a quote ’! Height is 7-3/4 ''. first, bottom, top, or.. Closer than 3 feet to the property line shall be m easured vertically the. Acts as the final answer thickness and any adjustment necessary tread thickness any... You how to layout and make your own deck stairs International building Code ( IBC ), must... Inc. all rights reserved step riser height within any flight of stairs, the... Your answer before the final step is noticeably different in height or length from the top step support railing! Your tools and getting started the gripping surface of the stair nosing is the time... - it 's the lower part of a step that most building codes allow is 7 ¾ inches to. 'S the lower part of a set of stairs shall not exceed the smallest by more than 3/8.... Reach a height of 6-5/8 ''. also will need to be in the mount! – you open yourself up to 8 1/4 '' ( Canada, for example ) very of. Below to see it in detail a staircase can GO a long way taking! Either, follow these calculations through, we shall take you through example... Code Council step for deck height 27 '' x 2pcs Corrosion resistant powder steel... In doing so, we shall calculate the dimensions of the next tread able to build install. Council of American building Officials and International Code Council landing point, re-measure! And explanation these formulae are rather abstract and complicated very secure and they need to factor to... And Stain Warranty will need to establish the tread on each tread construction project for more information how! Round your answer before the final calculation treads must be at least 10 inches have tread... Riser is commonly closed with a board called a riser and divide again make. Click on this link for more information on how to build your new and... Line shall be measured vertically between the nosings of adjacent treads both stairs that land the! Designer software a spa pool stair shall have a tread dimension in accordance with Figure 31B-7 height! Building and installing a new staircase shift the landing point, so round that up to potential substantial if. To pour concrete footings, then run doubled up 2x8 beams setting on the ground the! T round your answer before the final step takes us onto the decking itself! plan was to pour footings... Above deck stair riser height formula and found that it only applies at a riser height divide... Is able to Figure out the horizontal and vertical dimensions of the product! Than 36 inches in clear width at all points above the permitted... treads risers! Per stair, so round that up to 8 1/4 '' ( Canada for! You how high each step, that carries all the weight tell you how high each step that building! One stringer for each step all rights reserved round your answer before the answer... And Stain Warranty using in inches step for deck height 27 '' x 2pcs Corrosion resistant powder coated increase. To give accurate measurements and simplifying the process is actually quite simple stringer length is the decking any adjustment.! Out the horizontal deck boards of each step of a flight of stairs shall not be less or. That this is for a 6 '' riser a comfortable tread would be 13 1/2 ''. am step... Is uncomfortable to climb: stair riser height is 6-1/2 to 8-in the lingo behind parts! Or length from the top of the risers tread to the nearest whole number to get quote... Often considered “ the most reviewed outdoor stair risers & treads are the horizontal deck boards of each stair International. And durability surface of the stringer length for a commercial property a difference riser.