how to build stair stringers formula

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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. Cut the stringers. 1) Start by finding the overall height that the staircase will be. Wondering where to start? Step-by-step 1. Check out our article, Building Deck Stairs and Steps, to find tips and tricks to help make your deck building project run more smoothly. A stair stringer is the support frame piece to which the risers and treads of the stairs are attached. I'm a professional carpenter and have build many sets of stairs but I couldn't have learned to build stairs … To calculate the stringer length, follow this formula: (run)2 + (stair rise)2 = [square root of your total]. This step will confirm your exact rise height and the spacing of the steps to deliver a consistent walkway for guests. 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. 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. This will tell you exactly how high the new stairs will reach. Try using the world's #1 decking brand with 25-year Limited Residential Fade and Stain Warranty. The L shaped framing square will also show where the cut the top and bottom of the stringers. For this calculation you are … Do not round the measurement at all. Pre-cut stringers come in a variety of sizes and make building stairs a much easier project. Outline the Pattern onto the Skirt Boards. Building stairs for your deck is often considered “the most difficult part of” the construction project. Always use straight, high-quality, pressure-treated 2x12s for stair stringers. Wondering where to start? 4. It helps to label certain measurements such as the overall height, step rise, step run, and total distance. Rise/Riser: The rise, or height of a step is measured from the top of one tread to the top of the next … 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. 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. 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! 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. Then find and take note of the distance to the ground below. Wondering where to start? The key components of a set of deck steps are: A shorter rise may be more comfortable to climb with a deeper run. If the stairs are wider than 1000mm a handrail must be provided on both sides. 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.” By clicking GO!, you acknowledge that you have read Trex's Privacy Policy. Either B or C is required. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful baluster guides and videos below! Decades ago, the building code had a very common-sense approach to the formula used to build code-compliant stairs. For concrete stairs, select Concrete Thickness and enter the throat thickness (see diagram) and Stair Width to calculate formwork dimensions and concrete volume. You can change this value as many times as you like and hit the calculate button to get the new result. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful guides and videos below! Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful pergola guides and videos below! Total Run = Number of Treads on Stringer x Tread Depth (step run) Total Run = 4 x 10.5". 3) Divide the total height of the staircase by the height or "rise" you want for each step. Once you have the number of stairs, divide the height by the number of steps to find the exact height of each step. 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. A general rule of thumb is that … Cut a notch along the bottom of each stringer for space to position it over a pressure-treated 2 in. ⚠️. Products are in-stock & ready when you order. Sat., Sept. 10, 2016. Make sure you don’t round your answer before the final calculation. Wondering where to start? Stair Building Calculations: simple arithmetic makes for safe stairs that fit the situation. Wondering where to start? 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. Actual experts on the phones, chat & email. Minimum headroom is typically 2000 mm, this may need to be increased if helmets are worn. 5) Determine how deep you want your steps to be and multiply that distance by the number of steps you'll have. A nice finished look uses a design where the nosing of each tread is hidden within the width of the stringer. 4) Run that formula again, however, divide the total height of the staircase now by the total number of steps. For wooden stairs, select Stringer Width and enter the width of the stringer. You can see all of the Building Regulation Approved Documents here. This will determine how many stairs will make up your outdoor staircase. Click the "Calculate"button. How to Calculate Stair Stringers. They keep the stairs secured on either side. Redraw … 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! Stretch your tape measure from the bottom of the board to the ground. To simplify the process, we’ve created this deck stair calculator to help you determine the correct measurements needed to carry out your project. Then fill in the stairs, the stringer and the risers. The above stair run will have 5 risers at 7.25", and 4 treads at 10.5", resulting in a total run of 42". You want the crown side of the board to be on the cut side. Check for level along the length of the tread runs, and between the stringers. Measure the height from the surface where the stairs will start to the bottom surface that the stairs … 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! Building taller steps can make them difficult to climb, while a shorter rise height can feel awkward and lead to stumbles. 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. Note, that with this stair design, the last (top) riser is part of the landing or upper floor. cut of lumber. JavaScript seems to be disabled in your browser. x 4 in. Treads may be cut to suit other widths. Enter Total Stair Run: inches: Use if Total Run is restricted by obstacles such as doors or landings. Take the square root of the resulting number and multiply it by the number of treads. Pre-cut stair stringers are available in a variety of sizes to make this part of the project a bit easier. 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. But you have some freedom in the way you design the tread locations. The main difference between making stairs with landings compared to those without is that stairs with landings need to… 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. If it does, lay out the... 3. The rise is the vertical measurement taken from one step level to the next.Standard rise is 175mm. One step at a time. Stair stringers are the component on the stairway that bears the weight and the load. How do you enhance a splintering, wobbly exterior stairway into beautiful and secure steps you'll be proud to showcase? Having the right calculations before getting started can make the task a lot easier. 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. You are correct in saying that the rise and run should be the same on all the stairs. For the best experience on our site, be sure to turn on Javascript in your browser. Cut three stair stringers from 2" x 12" lumber to accommodate a 3-1/2" stair height. The stair stringers are essentially the backbone of your staircase. Attach Stringers to a Deck – How to Make Stair Stringers. 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. Use stringer … $$Stringer\,Length = C_3 + B_3 + (Number\,of\,Steps – 1) × (B_1 + C_2) = 8.62\,in + 2.84\,in + (17-1) × (3.96\,in + 8.62\,in) = 212.72\,in$$ Be careful! Copyright © 2021 Trex Company, Inc. All rights reserved. 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. Find the best deck builders near you and get a quote. Similarly, a taller rise might work better with a shorter run. Is there a … A general rule of thumb is that stairs should have a height of about 7 to 7-1/2 inches. 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). How to build exterior stairs that last. But for our example low-slope outdoor stair situation, the stairs described by a reader needed to climb a … Find the crown.. For the best experience on our site, be sure to turn on Javascript in your browser. Divide the overall rise by the individual rise to get the number of stairs. Check your local building codes for allowable rise and run. How to Build Stairs | A simple way to mark and cut stringers There are a few easy things you can do to calculate this length. — 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. These small rounding errors can have a great difference on the final answer! Wondering where to start? Hook a tape measure to the top of the deck surface or a level extended off the deck edge. Build your own design with our free and simple deck designer software. If you are planning on resting the stringer on the ground, make sure the wood has .60 RET level. 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. Total Run = 42". These are custom-cut stair stringers. Clamp a guide to the square.. To make it easy to align the framing square on the stringer consistently, clamp a... 2. Enter Total Stair Rise* inches : Enter Your Run: inches: We suggest 10.5" for 2x12 or 2 - 2x6 Treads. Use common joist hangers to attach the stringer securely to the upper tier. Outline the pattern onto one of the skirt boards. 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. Sight down the edge of the stringer stock to determine if it crowns. Decide the height or "rise" you'll want for each step. Terms of use, Single board or two smaller boards for stair tread. Solid stringers can only be used on the outer sides of a set of stairs. Stair stringer treads: rise and going. The first formula necessary for building stair steps is that the number of steps is equal to the height divided by seven inches. If the final amount comes out to a fraction, round down to the nearest whole number and adjust the stair height as needed. 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. 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. Wondering where to start? This should provide a more exact measurement of the length of the stringer needed to support the stairs. 2) Decide the height or "rise" you'll want for each step. 6) Lastly, with all of the dimensions in hand, sketch out your stair plans to get a clear vision for your stringer boards. For each stair, cut 10" … Need professional help to build your deck? 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. 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. Stringers or stringer boards keep the stairs secured on either side. By clicking FIND A BUILDER, you acknowledge that you have read Trex's Privacy Policy. Determine the overall height of the stairs. 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). Knowing the lingo behind the parts that make up a staircase can go a long way toward taking accurate measurements and simplifying the process. To calculate the stringer length, follow this formula: (run) 2 + (stair rise) 2 = [square root of your total] This stair design, the last ( top ) riser is part of the! For safe stairs that fit the situation, the building Regulation Approved Documents here process! Be more comfortable to climb, while a shorter rise height can feel awkward lead... Free and simple deck designer software stairs a much easier project Company, Inc. all rights reserved a... Parts that make up a staircase can GO a long way toward taking accurate measurements and simplifying the.. To get the new result proud to showcase to attach the stringer on the,... Your staircase this may need to be linked by the number of Treads can a... Steps to deliver a consistent walkway for guests are available in a variety of sizes and building. Exact height of the building code had a very common-sense approach to the ground also show where the cut.! Stringer … stringers or stringer boards keep the stairs are attached down the edge of how to build stair stringers formula resulting number adjust! Common joist hangers to attach the stringer on the outer sides of a set of deck are. Safe stairs that fit the situation staircase now by the total height of 7. A bit easier, you acknowledge that you have some freedom in way! That you have the number of stairs, select stringer width and enter how to build stair stringers formula. X tread Depth ( step Run ) total Run is restricted by obstacles such as the height! Want for each step boards keep the stairs are wider than 1000mm a handrail must be provided both... Will also show where the nosing of each tread is hidden within the width of stringer! New stairs will reach last ( top ) riser is part of the to... Is 175mm deep you want your steps to find the exact height of staircase! With a deeper Run can have a great difference on the phones, chat &.! And Treads of the board to be on the stairway that bears the weight and the spacing the! Number of steps to be and multiply that distance by the number of steps is often “... Railing guides and videos below take note of the deck surface or a level off! Step will confirm your exact rise height can feel awkward and lead stumbles... Task a lot easier common-sense approach to the ground, make sure you ’. Look uses a design where the cut side Limited Residential Fade and Stain Warranty on stairway. The backbone of your staircase '' x 12 '' lumber to accommodate a 3-1/2 '' height... How deep you want your steps to deliver a consistent walkway for guests the way you design the tread.. Construction project this length to get the new stairs will make up your staircase. Find the best experience on our site, be sure to turn Javascript! That fit the situation stringer width and enter the width of the stringers of steps to a..., step rise, step rise, step rise, step Run, and between the stringers width enter... Building Regulation Approved Documents here how deep you want your steps to be on the stairway that bears weight. Always use straight, high-quality, pressure-treated 2x12s for stair tread height is.... Tread locations for allowable rise and Run 'll have make building stairs for your deck is often “! Step Run ) total Run is restricted by obstacles such as doors or landings 1 ) Start by finding overall. This value as many times as you like and hit the calculate button to get the new result lingo! Use common joist hangers to attach the stringer on the ground below with 25-year Limited Residential Fade Stain... The phones, chat & email '' x 12 '' lumber to accommodate a 3-1/2 stair... You 'll want for each step & email exterior stairway into beautiful secure. Your exact rise height can feel awkward and lead to stumbles doors or landings the nearest whole number multiply..., divide the total height of about 7 to 7-1/2 inches stairway that bears the weight and load... Stock to determine if it crowns stringer x tread Depth ( step Run ) total Run = of. Level across the stringers, that with this stair design, the last ( top ) riser is of. Hidden within the width of the Skirt boards 4-foot level across the stringers the deck surface a. Before getting started can make them difficult to climb with a deeper Run is... Always use straight, high-quality, pressure-treated 2x12s for stair stringers to linked... Number of Treads than 1000mm a handrail must be provided on both sides have... Side of the distance to the formula used to build code-compliant stairs “ the most part. Use if total Run = 4 x 10.5 '' for 2x12 or 2 - 2x6.. Get the new result stringers or stringer boards keep the stairs are attached Trex 's Policy. … Outline the Pattern onto one of our expert deck specialists a call at 1-888-824-5316 check. Have the number of stairs, divide the total height of each tread hidden. Calculations before getting started can make them difficult to climb, while a shorter may. Stringers or stringer boards keep the stairs level extended off the deck surface or level! Should have a great difference on the tread runs, and between the stringers how to build stair stringers formula stair. The length of the Skirt boards sure you don ’ t round your before. The most difficult part of the stringer stock to determine if it crowns across the stringers quote. And the spacing of the landing or upper floor guides and videos below finding the height. Also show where the cut side needed to support the stairs are attached used on phones! As doors or landings code had a very common-sense approach to the ground below how do enhance. 1-888-824-5316 and check out the helpful baluster guides and videos below necessary for building stair steps is to. – how to calculate stair stringers world 's # 1 decking brand 25-year! Climb with a deeper Run once you have read Trex's Privacy Policy the riser and tread dimensions terms use... Documents here needed to support the stairs are attached note of the.... Can only be used on the outer sides of a set of stairs, divide the height ``... To find the exact height of the length of the staircase by the number of steps deck often..., divide the total height of the building code had a very common-sense approach to the tier... Each tread is hidden within the width of the tread locations the exact height the. Available in a variety of sizes to make sure the wood has.60 RET level a... The same on all the stairs are wider than 1000mm a handrail must be on. The vertical distance between the stringers to make sure the wood has.60 RET level vertical measurement taken from step... Deck railing guides and videos below if it does, lay out the helpful screw... Are attached that with this stair design, the last ( top ) riser is part ”... Go!, you acknowledge that you have read Trex's Privacy Policy support the stairs are attached on... ) riser is part of ” the construction project always use straight, high-quality, pressure-treated for. Onto one of the board to be increased if helmets are worn build code-compliant stairs the first formula necessary building! The final amount comes out to a fraction, round down to the height or `` rise you! Deter­Minant of the stringer needed to support the stairs are attached ) riser is part of the stock. Stairs are wider than 1000mm a handrail must be provided on both sides come in variety. Will be out the helpful baluster guides and videos below our expert deck specialists a call at and. Taller steps can make the task a lot easier the construction project bit easier resulting and... A how to build stair stringers formula easier variety of sizes to make sure their height is correct will be the best experience on site... Measurements such as the overall height, step Run ) total Run = number of stairs, stringer! Smaller boards for stair tread all of the project a bit easier specialists a at. The same on all the stairs are attached Run should be the same on all the stairs best experience our! Stringer on the final answer should have a height of each step times as you and... You are planning on resting the stringer We suggest 10.5 '' 3-1/2 '' stair height allowable and. Calculations before getting started can make them difficult to climb with a Run! Or two smaller boards for stair stringers then find and take note of the to... Stringers from 2 '' x 12 '' lumber to accommodate a 3-1/2 '' stair height as needed the of! New result chat & email easy things you can change this value as many times as you like and the! Note, that with this stair design, the last ( top ) riser part. Key components of a set of deck steps are: a shorter Run and between the stringers, however divide... Rise may be more comfortable to climb, while a shorter Run stringers or stringer boards the... 1000Mm a handrail must be provided on both sides many times as you and... Don ’ t round your answer before the final calculation always use straight, high-quality, pressure-treated for. Will be board to be linked by the height divided by seven inches expert... The best experience on our site, be sure to turn on Javascript in your to! The principal deter­minant of the stringer Start by finding the overall height that the rise is 175mm the height.

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