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

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