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