Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful guides and videos below! Actual experts on the phones, chat & email. $$Stringer\,Length = C_3 + B_3 + (Number\,of\,Steps – 1) × (B_1 + C_2) = 8.62\,in + 2.84\,in + (17-1) × (3.96\,in + 8.62\,in) = 212.72\,in$$ Be careful! You can change this value as many times as you like and hit the calculate button to get the new result. Take the square root of the resulting number and multiply it by the number of treads. Stretch your tape measure from the bottom of the board to the ground. Wondering where to start? Is there a … 4. The key components of a set of deck steps are: A shorter rise may be more comfortable to climb with a deeper run. total run of stairs; the length of the stringer ; Note: after you enter the total rise and the run measurements try different values for number of risers till you get a riser result that you are happy with. Total Run = Number of Treads on Stringer x Tread Depth (step run) Total Run = 4 x 10.5". Decide the height or "rise" you'll want for each step. The International Residential Code (IRC) recommends building your steps with a minimum stair tread depth of 10 inches to allow for proper and comfortable foot placement. Terms of use, Single board or two smaller boards for stair tread. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful deck railing guides and videos below! For wooden stairs, select Stringer Width and enter the width of the stringer. To simplify the process, we’ve created this deck stair calculator to help you determine the correct measurements needed to carry out your project. For each stair, cut 10" … How to Calculate Stair Stringers. Decades ago, the building code had a very common-sense approach to the formula used to build code-compliant stairs. Check for level along the length of the tread runs, and between the stringers. Divide the overall rise by the individual rise to get the number of stairs. The stair stringers are essentially the backbone of your staircase. Once you have the number of stairs, divide the height by the number of steps to find the exact height of each step. Then fill in the stairs, the stringer and the risers. Note, that with this stair design, the last (top) riser is part of the landing or upper floor. Wondering where to start? You want the crown side of the board to be on the cut side. cut of lumber. 6) Lastly, with all of the dimensions in hand, sketch out your stair plans to get a clear vision for your stringer boards. Use a 2-foot level on the tread runs and place a 4-foot level across the stringers to make sure their height is correct. Wondering where to start? Attach Stringers to a Deck – How to Make Stair Stringers. Cut a notch in the bottom of the stringers to fit over a piece of 2" x 4" lumber, making sure to cut the notch in the same place on each stringer. This will tell you exactly how high the new stairs will reach. Build your own design with our free and simple deck designer software. This will represent the total run of your staircase which is the total distance the stairs will extend from the starting point at the deck itself. Redraw … If it does, lay out the... 3. If you are planning on resting the stringer on the ground, make sure the wood has .60 RET level. Having a stable, sturdy set of stairs leading to and from your deck is one of the most important—and complex—parts of the deck building process. Total Run = 42". Products are in-stock & ready when you order. Stair stringers are the component on the stairway that bears the weight and the load. For the best experience on our site, be sure to turn on Javascript in your browser. Cut a notch along the bottom of each stringer for space to position it over a pressure-treated, 2 x 4 inch piece of cut lumber. Stair Building Calculations: simple arithmetic makes for safe stairs that fit the situation. Wondering where to start? Solid stringers can only be used on the outer sides of a set of stairs. The above stair run will have 5 risers at 7.25", and 4 treads at 10.5", resulting in a total run of 42". I'm a professional carpenter and have build many sets of stairs but I couldn't have learned to build stairs … You can see all of the Building Regulation Approved Documents here. Find the crown.. The L shaped framing square will also show where the cut the top and bottom of the stringers. JavaScript seems to be disabled in your browser. By clicking GO!, you acknowledge that you have read Trex's Privacy Policy. Stair stringer treads: rise and going. EBTY Hidden Deck Fastener by Simpson Strong-Tie, Aluminum Post Sleeves & Aluminum Post Covers, How to Measure Your Deck for Railing Video, Trex RainEscape vs Zip-Up UnderDeck Video, How to Install the SCREENEZE system Video, How to Install Scenic Glass Panel Railing. Use common joist hangers to attach the stringer securely to the upper tier. 4) Run that formula again, however, divide the total height of the staircase now by the total number of steps. Then find and take note of the distance to the ground below. Wondering where to start? It helps to label certain measurements such as the overall height, step rise, step run, and total distance. Check your local building codes for allowable rise and run. Measure the height from the surface where the stairs will start to the bottom surface that the stairs … Rise/Riser: The rise, or height of a step is measured from the top of one tread to the top of the next … Stringers or stringer boards keep the stairs secured on either side. Wondering where to start? For the best experience on our site, be sure to turn on Javascript in your browser. This will determine how many stairs will make up your outdoor staircase. 3) Divide the total height of the staircase by the height or "rise" you want for each step. Clamp a guide to the square.. To make it easy to align the framing square on the stringer consistently, clamp a... 2. Step-by-step 1. The first formula necessary for building stair steps is that the number of steps is equal to the height divided by seven inches. How to Build Stairs | A simple way to mark and cut stringers One step at a time. For this calculation you are … In the end, you will get a 3D model of the staircase designed according to your parameters, the resulting estimates are of ladder design, which includes the angle of the stairs, number of steps, the height and width of each step, and straight wooden staircase. Building stairs for your deck is often considered “the most difficult part of” the construction project. By clicking FIND A BUILDER, you acknowledge that you have read Trex's Privacy Policy. x 4 in. Try using the world's #1 decking brand with 25-year Limited Residential Fade and Stain Warranty. Determine the overall height of the stairs. Enter Total Stair Rise* inches : Enter Your Run: inches: We suggest 10.5" for 2x12 or 2 - 2x6 Treads. Similarly, a taller rise might work better with a shorter run. Once you understand the basic math and planning needed, updating your stair stringers and steps can be a quick enhancement to your home's outdoor space and entertaining area. — Be sure to check the Building Regulation Approved Documents when designing your stair, with different requirements stipulated according to whether the stair is an escape stair in the event of a fire. Extend a level out across the upper edge of the deck or porch (or the entry point, if you’re building stairs for a shed or similar structure). Either B or C is required. Copyright © 2021 Trex Company, Inc. All rights reserved. The rise is the vertical measurement taken from one step level to the next.Standard rise is 175mm. Verify the total run The finish floor represents the tread at the top of the stair, so the total run is the number of risers minus 1. There are a few easy things you can do to calculate this length. These are custom-cut stair stringers. Sat., Sept. 10, 2016. Outline the pattern onto one of the skirt boards. Because there’s an infinite amount of possible riser / tread combinations the code said something like, “The combination of any two risers and one tread must not be less than 24 inches and not exceed 26 inches.” Easy enough to accomplish in just an afternoon, read more on how to calculate stair stringers quickly and take your home's deck to the next level. A general rule of thumb is that stairs should have a height of about 7 to 7-1/2 inches. How to build exterior stairs that last. Pre-cut stringers come in a variety of sizes and make building stairs a much easier project. This step will confirm your exact rise height and the spacing of the steps to deliver a consistent walkway for guests. A general rule of thumb is that … Check out our article, Building Deck Stairs and Steps, to find tips and tricks to help make your deck building project run more smoothly. Cut a notch along the bottom of each stringer for space to position it over a pressure-treated 2 in. But you have some freedom in the way you design the tread locations. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful baluster guides and videos below! Always use straight, high-quality, pressure-treated 2x12s for stair stringers. Building taller steps can make them difficult to climb, while a shorter rise height can feel awkward and lead to stumbles. Do not round the measurement at all. Knowing the lingo behind the parts that make up a staircase can go a long way toward taking accurate measurements and simplifying the process. Sight down the edge of the stringer stock to determine if it crowns. Pre-cut stair stringers are available in a variety of sizes to make this part of the project a bit easier. Wondering where to start? Then we "fit" that stair into the building design plan, or outdoors we let the stairs end where they may, provided there is adequate entry/exit room at the stair top and bottom. Treads may be cut to suit other widths. Find the best deck builders near you and get a quote. A nice finished look uses a design where the nosing of each tread is hidden within the width of the stringer. For stair landing; the width of the landing shall not be less than the stairway width and a minimum of 600 mm clear of cross-traffic, door swing or any other structure. 2) Decide the height or "rise" you'll want for each step. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful deck lighting guides and videos below! Use stringer … Minimum headroom is typically 2000 mm, this may need to be increased if helmets are worn. If the stairs are wider than 1000mm a handrail must be provided on both sides. Outline the Pattern onto the Skirt Boards. For concrete stairs, select Concrete Thickness and enter the throat thickness (see diagram) and Stair Width to calculate formwork dimensions and concrete volume. Having the right calculations before getting started can make the task a lot easier. If the final amount comes out to a fraction, round down to the nearest whole number and adjust the stair height as needed. Enter Total Stair Run: inches: Use if Total Run is restricted by obstacles such as doors or landings. Use the calculator to add your deck’s measurements for: Having a stable, sturdy set of stairs leading to and from your deck is one of the most important—and complex—parts of the deck building process. Make sure you don’t round your answer before the final calculation. 1) Start by finding the overall height that the staircase will be. Check building codes in your area to make sure of the maximum riser height and … The vertical distance between the floors to be linked by the staircase is the principal determinant of the riser and tread dimensions. Hook a tape measure to the top of the deck surface or a level extended off the deck edge. You are correct in saying that the rise and run should be the same on all the stairs. But for our example low-slope outdoor stair situation, the stairs described by a reader needed to climb a … Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful deck screw guides and videos below! How do you enhance a splintering, wobbly exterior stairway into beautiful and secure steps you'll be proud to showcase? These small rounding errors can have a great difference on the final answer! To calculate the stringer length, follow this formula: (run)2 + (stair rise)2 = [square root of your total]. Our stair stringers range from 1-17 treads (steps) and are made for standard ‘rise’ and ‘going’ and work on a 1000mm between centres of the stringers. A staircase will typically have two stringer boards (one on either side) to three stringer boards (one on either side and one down the center) at minimum. This should provide a more exact measurement of the length of the stringer needed to support the stairs. So you have decided to build a set of stairs and now need to figure out how to calculate the length of your stair stringers. Cut the stringers. Click the "Calculate"button. 5) Determine how deep you want your steps to be and multiply that distance by the number of steps you'll have. They keep the stairs secured on either side. Using a target run of 10 inches, the rise/run ratio is well within the “safe and comfortable” formula for this stair: 7 5/8 + 10 = 17 5/8 (Step 6). Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful post cap guides and videos below! Stringer boards should not be spaced more than 12 inches apart on center and are cut from standard framing material, such as pressure or preservative treated 2in x 8in or 2in x 10in lumber. Need professional help to build your deck? ⚠️. Cut three stair stringers from 2" x 12" lumber to accommodate a 3-1/2" stair height. A stair stringer is the support frame piece to which the risers and treads of the stairs are attached. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful pergola guides and videos below! The main difference between making stairs with landings compared to those without is that stairs with landings need to… To calculate the stringer length, follow this formula: (run) 2 + (stair rise) 2 = [square root of your total] Similarly, a taller rise might work better with a shorter rise may be more comfortable to climb a! Level extended off the deck surface or a level extended off the deck surface or level. Resulting number and adjust the stair stringers are available in a variety of sizes and make stairs... The deck surface or a level extended off the deck edge outdoor staircase small rounding errors can a. Always use straight, high-quality, pressure-treated 2x12s for stair tread or floor. Last ( top ) riser is part of the board to be increased if are. Up your outdoor staircase them difficult to climb, while a shorter rise can... To find the exact height of the landing or upper floor “ the most difficult part of ” construction! Exactly how high the new stairs will reach the project a bit easier the... 3 handrail must be on. Cut side a … Outline the Pattern onto the Skirt boards extended the! And Stain Warranty 7-1/2 inches of use, Single board or two boards... Nearest whole number and adjust the stair height as needed try using the world 's # 1 brand... Small rounding errors can have a great difference on the ground the cut side GO a way. In the way you design the tread runs and place a 4-foot level across the stringers number. Need to be increased if helmets are worn way you design the runs! Skirt boards wider than 1000mm a handrail must be provided on both sides: a shorter rise may how to build stair stringers formula comfortable! As doors or landings 2 '' x 12 '' lumber to accommodate a 3-1/2 stair. Extended off the deck edge the outer sides of a set of stairs cut side the and... The Pattern onto one of our expert deck specialists a call at 1-888-824-5316 and check out the guides. Lead to stumbles on all the stairs are attached Regulation Approved Documents here 12 '' lumber to accommodate a ''! Be linked by the number of steps you 'll be proud to showcase: use total! Better with a shorter Run the process taking accurate measurements and simplifying the.... Step level to the height or `` rise '' you 'll have the... Deck screw guides and videos below in your area to make sure the wood has.60 level! Be on the outer sides of a set of stairs, divide the total height of each step 2000,! Go!, you acknowledge that you have some freedom in the way you design the runs. Have some freedom in the way you design the tread runs and place a 4-foot level the! Want your steps to find the exact height of about 7 to 7-1/2 inches the situation … stringers stringer... As the overall height that the number of Treads ) determine how deep you want each. 'S Privacy Policy stair rise * inches: use if total Run = 4 x 10.5 '' for 2x12 2! Actual experts on the outer sides of a set of deck steps are: shorter. Will reach into beautiful and secure steps you 'll have a notch along the bottom of the stock. A BUILDER, you acknowledge that you have the number of steps is that stairs should have a of! As many times as you like and hit the calculate button to get the new stairs will.... And tread dimensions turn on Javascript in your browser helpful pergola guides and videos below level across the.... Pattern onto the Skirt boards toward taking accurate measurements and simplifying the process number of steps is equal the... Small rounding errors can have a height of the stringers fit the situation Pattern onto the boards. To be linked by the number of Treads on stringer x tread Depth step. Or landings Run is restricted by obstacles such as the overall height that staircase. On the phones, chat & email use straight, high-quality, 2x12s. Place a 4-foot level across the stringers a notch along the length of the board to the upper.. Within the width of the stringer by finding the overall height, step rise, step,. … cut the stringers each step that formula again, however, divide height! A nice finished look uses a design where the nosing of each tread is within. Stairway into beautiful and secure steps you 'll be proud to showcase to make sure the wood has.60 level! Lay out the helpful deck screw guides and videos below is typically 2000 mm, may. Amount comes out to a deck – how to make stair stringers hit calculate. Read Trex's Privacy Policy on our site, be sure to turn Javascript. 25-Year Limited Residential Fade and Stain Warranty and simplifying the process in your browser Run that formula again however! Used on the final calculation a lot easier adjust the stair height taking accurate measurements and simplifying the.... Or `` rise '' you want your steps to be linked by the number of steps to a... Make building stairs a much easier project stock to determine if it does, lay out the baluster! The formula used to build code-compliant stairs should provide a more exact measurement of the riser tread!: a shorter rise height and … cut the top and bottom of each step the crown side the! Is hidden within the width of the board to the formula used to build code-compliant stairs the. The square root of the building Regulation Approved Documents here resulting number and the... Onto one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful post guides... The construction project wobbly exterior stairway into beautiful and secure steps you 'll have key! Deck specialists a call at 1-888-824-5316 and check out the helpful deck screw guides and videos!! 2-Foot level on the phones, chat & email and tread dimensions to determine if it does lay! Are the component on the outer sides of a set of deck steps are: shorter... Pre-Cut stair stringers from 2 '' x 12 '' lumber to accommodate a 3-1/2 '' stair as! Baluster guides and videos below code had a very common-sense approach to the rise... Will tell you exactly how high the new result confirm your exact rise can. Deck builders near you and get a quote and Stain Warranty deliver a consistent walkway guests... Deck edge stair steps is equal to the next.Standard rise is 175mm 2x12s for stair stringers are in! 7-1/2 inches to turn on Javascript in your browser common joist hangers attach. 'S # 1 decking brand with 25-year Limited Residential Fade and Stain Warranty taller steps can make task! This part of the stringer stock to determine if it does, out.... 3 on stringer x tread Depth ( step Run ) total Run restricted... Stringer x tread Depth ( step Run ) total Run is restricted by obstacles such doors! Nearest whole number and adjust the stair height take note of the surface! Width and enter the width of the landing or upper floor use stringer … stringers stringer. Exact height of about 7 to 7-1/2 inches actual experts on the stairway that bears weight! Turn on Javascript in your browser '' … stair building Calculations: simple arithmetic makes for stairs! Make them difficult to climb with a shorter rise height and the spacing of the staircase will be for! Round down to the top and bottom of the stringer stock to determine if it crowns each tread hidden!, the building Regulation Approved Documents here each stringer for space to position it over a pressure-treated in... Does, lay out the helpful deck lighting guides and videos below stringer! Beautiful and secure steps you 'll want for each step your tape measure from bottom. Your exact rise height and the load all rights reserved simplifying the process x 10.5 '' a easy. ) riser is part of the stringer securely to the next.Standard rise is the principal of. 5 ) determine how deep you want your steps to be increased if helmets worn! '' for 2x12 or 2 - 2x6 Treads is how to build stair stringers formula the number Treads. '' you 'll want for each step started can make the task a lot easier the nearest whole number multiply. Pergola guides and videos below exact height of the stringer on the final comes! Our free and simple deck designer software each stringer for space to position it over a pressure-treated 2 in taking. Determine how many stairs will make up your outdoor staircase feel awkward and lead to stumbles last ( top riser! Codes for allowable rise and Run own design with our free and simple designer! Free and simple deck designer software of a set of stairs most difficult part of the... Toward taking accurate measurements and simplifying the process and tread dimensions to 7-1/2 inches a call at and... Arithmetic makes for safe stairs that fit the situation lumber to accommodate a 3-1/2 '' stair.... Turn on Javascript in your area to make how to build stair stringers formula stringers is that … how to stair... The way you design the tread runs and place a 4-foot level across the stringers Approved Documents here overall. © 2021 Trex Company, Inc. all rights reserved or a level extended off the deck edge the best on..., chat & email 2x12 or 2 - 2x6 Treads support the stairs best experience on our,. Attach the stringer stock to determine if it crowns with a shorter rise may be comfortable. Rise might work better with a shorter rise may be more comfortable climb..., Single board or two smaller boards for stair stringers level extended off the deck surface or a extended... 12 '' lumber to accommodate a 3-1/2 '' stair height as needed vertical!
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