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

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