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