Rise is the distance from one tread to the next while run is the distance from riser to riser. Because deck wood is exposed to weather, which can cause wear that impacts the structural integrity of the lumber, most pre-cut pressure-treated deck stair stringers use 2×12 lumber for both long and short spans. Instead, cut to the line with the circular saw, then use a hand saw to finish the cut. We suggest 10.5" for 2x12 or 2 - 2x6 Treads. For this calculation you are … If the throat is too narrow, the stairs could fail, causing catastrophic injury. Once you know the rise and run that you want your stairs to be, you can go ahead and draw out the cut lines on the 2×10 or 2×12. It’s important to note that proper cutting is crucial for maintaining the minimum throat width. Measure the Total Rise to the Deck Landing. Register the straight edge to the stair’s rise and run. Deck stair stringers use pressure-treated wood versus standard wood. check for level along the length of the tread runs, and between the stringers. A 2×10 board may not be wide enough to handle the larger notch while still maintaining a 3.5-inch throat. Deck Stair Stringers Spacing A knot that ends up in the throat of one of your notches will eventually dry out, potentially making the stairs structurally unsound. or 2-1/2 in. Item #130008 Model #LSCZ. Look for boards that are in good condition with few knots when selecting lumber for a stair stringer. While it is possible to reach the minimum stair depth tread of 10 inches (again using the 1.25-inch maximum tread nose depth) while still maintaining the minimum throat width of 3.5 inches, you would have to go with an awkward stair rise of just 4 inches. With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. While it’s possible to increase the tread depth by decreasing the riser height to make the notch small enough to maintain a 3.5-inch throat in a 2×10 board, it will take a longer run to reach the second level. I am about to trace them out on the wood and assumed that I should use 2x10 wood but I'm second guessing myself and thinking maybe I should use 2x12 wood for the stringers. Use the long-lasting stringer to build stairs on decks, gazebos, terraces and porches anywhere stairs will … To simplify the process, we’ve created this deck stair calculator to help you determine the … Do not accommodate for this by cutting beyond your mark. Use 2x12s for your stair stringers unless doing so creates a problem with the clearance in the space beneath the stairs. A stair stringer is the structural framing that creates and supports a set of stairs. You have now learned the in's and out's of stair stringer layout Get a carpenters framing square and if you have little buttons that clamp or screw onto the square even better. But you have some freedom in the way you design the tread locations. When failures do occur with stairs, the size of the notch cut into the stringer is often the culprit. They should be stout enough to support the weight of the steps and the people using them. The stairs collapse without warning. In the case of a stairwell that is supported on both sides by walls, 2×20 stringers are adequate as they gain the additional support of the wall studs. You want to end up with something like this if your are planning a cut and notched stringer. Unfortunately, when this type of failure occurs, there is typically a little warning. This is typically referred to as rise over run. This makes using the proper stringer width critical when constructing stairs. Learn deck stair stringer layout techniques for nothed or solid stringers. Lay a straight piece of 2x12 on sawhorses. If you are using closed stringers, cut treads to fit between them. Divide the overall rise by the individual rise to get the number 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. By looking at standard stair heights, we can determine what dimensional lumber will work and what won’t work. 2x8; 2x10; 2x12; 5/4 radius deck boards. For decks, use 2×12 stringers unless you’re building a cedar deck. Building stairs for your deck is often considered “the most difficult part of” the construction project. Then slide the square down the board and continue to trace the shape of the stairs until you reach the other end of the board. The International Building Code stipulates that a set of stairs must be able to handle a minimum concentrated load of about 40 pounds per square foot live, which refers to the temporary load placed upon the steps when someone is using them, or about 10 pounds per square foot dead, which is the amount of constant weight applied to the stairs. It’s impractical for stairs connecting multiple floors in a home. For a 2×10 stringer, the maximum tread width you can achieve with a 7-inch rise and still maintain a 3.5-inch throat is about 10 inches if you use the maximum stair tread nose allowed by the building code of 1.25 inches (the stringer itself would have a run of about 9 inches). Then rotate the square until the measurement for the rise matches the number on the square’s short side. The LSC adjustable stair-stringer connector offers a versatile, concealed connection between the stair stringer and the carrying header or rim board while replacing costly framing. Aside from making sure you have at least 5" from the bottom edge of the 2x12 to the inside corner of the throat or notch, you just have to do the cuts nicely. The standard rise over run for a set of stairs joining two floors in a home with 8-foot ceilings is similar at 7.5 inches and 10 inches. 2x12 would be best if cost weren't a factor but would 2x10's suffice for my stringers? I mount stair stringers directly to 2x12 rim joists or to a header set directly beneath 2x8 or 2x10 rim joists. Bracket systems normally use material wider than 2x8, simply because it is necessary to get code-compliant tread dimensions. Use three fasteners per joint for a 2x12 or 2x10 tread, two fasteners for narrower boards. The stringer is a 6 step. Strong-Drive® SD screws; Shop all Simpson Strong-Tie here. The 3.5-inch rule pretty much makes using 2x8s difficult and, in some cases, awkward. Think it through as I show you the drafting and layout techniques for all of them plus building code references. A stair stringer is created from a piece of 2×10 or 2×12 by measuring and cutting notches on the board to create the steps. The quotient is the number of rises you will trace out on the 2x12. If there isn't a floor joist conveniently located to screw the stringers to, install blocking using three 16d nails on each end. Where homeowners and builders connect with each other! How to Cut Stair Stringers With a Framing Square, What Size Lumber for Deck Stair Stringers. x 3 in. Imagine drawing a straight line that would connect the corner of each notch in the stair. Think of a stair stringer as the framing for a set of stairs. Draw the first step using a square to mark the profile of the stairs. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. Having the right calculations before getting started can make the task a lot easier. For nominal rafter sizes: 2x8, 2x10, 2x12; Seat width: 1-9/16 in. If the joist are 2x10 or 2x12 you may be able to secure the stairs against the lower portion of the rim joist. You can change this value as many times as you like and hit the calculate button to get the new result. Just enter a zip code. A stair stringer is the structural framing that creates and supports a set of stairs. Stairs are cut from 2x12's. Find deck builders from the USA and Canada. I do have room to lengthen the run a couple of inches if necessary. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. ... (typically suitable for 2x10 or 2x12 header / rim board) or lower on the face (typically suitable for a 2x12 header / rim board). This will cause structural weakness in the stringer. Then measure from the width of the throat, which is the shortest point between the corner of the step and the outer edge of the board. Privacy Screens -How High Can I Go With Titan Wood Post Anchor? While you may find some information stating that it is okay to use 2x8s for stair stringers, in most cases, it won’t work. Should a stair stringer be 2×10 or 2×12? Plywood may be more stable than 2x12 lumber, but it won't have near the bending strength. nails, 0.162 in. It is acceptable and within building code guidelines to use either 2×10 or 2×12 dimensional lumber to create a set of stairs; however, a stair stringer should not be less than 3.5 inches wide at its narrowest point to provide adequate strength for the load the stairs will be supporting. 8" rise and 10.5" run... total rise is 47.5" and total run is 54". Notice how the nosing of the treads does not stick out beyond the edge of the 2x12. Made from 18-gauge steel; ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications; Install with 0.148 in. Only a 2x12 rim joist has enough depth to fasten the stringer hardware to it and provide enough height for the last riser (Figure 12). Align the rise and run measurements on the square with the edge of Laying out the stringer. The IRC provides guidance for how high the risers can be and how deep the treads can be. (Circle One) {#1} Stair Stringers—2x10; 2x12; Other (Circle One) {#5} Treated; Redwood, Cedar; Other (Circle One) {#6} Deck Balustrade—Wood, Metal, Composite, Other (When using tapered or decorative balusters, Remember the maximum They are also significantly more expensive, costing five times or more than the price of standard pine. I just want to put up two 6x6 posts with Titan Wood Post Anchors, either 35 or 70 apart, I am building a 10'x12'deck (not attached to a ledger board). Note: the unit run should be about 1" less than the length of the tread so you create a nice nosing. Either B or C is required. Item #1255902 Model #1255902 Then we mark off the end cut line of the stringer and proceed to trace out each sequential unit rise and run. x 3-1/2 in. Finish off by extending the vertical line down to the edge of the board. My stringers/beams need to span 14 ft. My joists need to span 10 ft. Just wondering if I can use 3- 2x12 nailed together for my two stringers to span the 14 ft or if I need to use 2- 2×14s nailed together? Whether building a set of steps for the interior of your home or a backyard deck, it’s critical to choose the right lumber for the backbone of your stairs: stair stringers. Since the Tread Depth [B] is a constant, when using the Automatic Stair Calculator, the Total Run [G] will vary when you toggle between the two mount options. Total height of low level ground level deck. She would like it to be as high as possible, with. Any rim joist thats going to hold a staircase gets doubled. May be installed flush with the top of the carrying member or lower on the face. Overcut can remove an additional 3/4 of an inch of material, which can cause considerable structural weakness. According to the IRC, the maximum riser height is 7.25 inches and the minimum tread depth is 10 inches with a stair tread nose range of 3/4 inches to 1-1/2 inches past the front of the rise. The Stringer Mount Type refers to how the stringer will be attached to the upper landing or deck frame.. Once the stair results have been calculated, you can toggle between the Standard and Flush options to compare the differences. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Once you know the rise and run of each step and you have calculated how long the stringer needs to be, you can determine how this will affect the throat width of each stringer. While using a 2×10 is acceptable, keep in mind that it limits the stair size you can use. nails or #10 x 1-1/2 in. 2x10 works for the treads, and I'd bolt them too. Divide that number by the ideal Unit rise of 7-3/4". ... 2 1/2" #8 Deck Screws: Some stairs have two interior walls on either side, which means the stringer will have a significant amount of support from the house framing. In these cases, it makes sense to use a 2×12 board for the stringers. As such, pre-cut cedar stringers often use 2×10 boards. Subsequently, question is, how far can you span deck posts? With these limitations and the 3.5-inch rule in mind, you can get a better picture of whether to use a 2×10 or 2×12 stringer. This could make a difference if you have a functional open area under your stairs. Use this first stringer as a pattern to lay out all the others. Using 2x12 lumber for the stringers will allow you to cut the stringers so they fit up and behind the rim joist. Get the Tools You'll Need to Layout the Deck Stairs + Stair Gauges, also referred to as Stair Lugs, … 5-Step Pressure Treated Southern Yellow Pine Deck Stair Stringer. I am looking to install privacy screens on my concrete patio. You would probably need to increase the thickness by about 60 percent to have an equivalent unsupported stringer. Secure the blocking with through screws or hardware. Replaces additional framing and toe-nailing. As such, they determine the height of each step as well as the depth of each tread. Place your stair stringer board (2x10 or 2x12) across a pair of sawhorses and place the square flat on top of it. ... depending on how you plan to tie the stringers into the deck framing. All Rights Reserved. Attaching Stairs to A Deck - Methods and Tips To attach notched stringers to a deck requires attaching some kind of backer board to the rim joist, increasing the width of the rim joist so the stringer has more material to contact. Home  >  Deck Stairs   >  Stair Stringer Layout. A 2×12 stringer with a wider throat will need fewer supports than a 2×10 stringer with a 2.5-inch throat. Do you prefer the tread nosing to be set within the periphery of the width of the outer stringers? Suitable for most installations on nominal 2x10 or 2x12 header/rim board. This line should be no closer to the outer edge of the stringer than 3.5 inches to ensure proper structural integrity. Now it's time to find out how to carefully cut out the notches. This may work in cases where you’re using just a few stairs for a single room with multiple levels, such as a sunken living room. Use some 2x4 cleats and bolt them with washers. closed. If you are using a 1x material to close off the riser space, consider it's thickness. Creating this kind of layout requires a few simple tricks. With a circular saw, cut out the stringer. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. The difference between the stair rises and tread depths cannot vary by more than 3/8" from the largest to the smallest. Using the inside measurements on the square adjust the placement of the square so that it aligns exactly with the edge of the board corresponding to your rise and run (6-13/16" of rise and 9-3/4" run from the example above). If the outside stringers are notched, cut the treads so they overhang 1-1/2 inches on each side. This deck is an example of that. Given how critical the structural integrity of stair stringers is, it almost always makes sense to err on the side of caution and go with 2×12 lumber. For example, the standard rise over run for stairs covering 9 feet is a 7-inch rise and 11-inch run. It’s important to understand that while this treatment makes the wood more resistant to weather and pests, it does not make the lumber structurally stronger. If the stringer is supported along its entire length, it shouldn't be a problem. Extend the horizontal line across the 2x12. You can now draw the notches for the stairs onto your 2x12 stair stringers. Tracing Out First Unit Rises and Unit Runs on Stringer. First, if the deck is framed out of 2x8 lumber, you can attach the stringers as shown in the diagram. Considering most stairs use three stringers, this cost difference does add up. Quality is also an important factor to consider. Similarly, it is asked, how far can I cantilever a 2x10? I am building a set of stairs that is going to a platform that is only about 4 ft high. Things like the wood type, quality, design, span, number of stringers, and cost are also elements to consider when choosing lumber to use for your stair stringers. Cedar, which is also an option for deck stairs, is stronger and more durable than pressure-treated lumber. There is no solid stringer covering the outsides of the steps. On 2019-07-31 - by (mod) - Steve I'd like to see a photo, but yes it's quite possible that someone felt that the stairs were not adequately supported by the stringers so added a post at mid-span. 2x8 rim joist is really pushing it. There are other ways to build and other materials but cleated stringers with common PT lumber will be the least expensive and easiest. Some stairs have notched stringers everywhere. we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. The stringers are typically made from dimensional lumber that is cut to the shape of the stairs. Building a deck. because many stairs require a midspan stringer which is always notched. A notch that is too deep for the board creates a throat (the space between the corner of the notch and the opposing edge of the board) that is too narrow to hold an adequate load. Neither the IRC nor International Building Code have specific code requirements or guidance for the type of lumber you can use for stair stringers. You have to know both methods For the throat to be strong enough to support this load, it should be at least 3.5 inches wide, the same width as a 2×4. Trace out the Unit Rise and Unit Run as shown by the measurements on the square. Span also makes a difference when it comes to selecting lumber size. They would be deck screwed into a 2x10 joist. The rim joist must be able to … Hardwood stringers only make sense if the stringers themselves will be exposed and you want to take advantage of the aesthetic appeal of hardwood. If your total height is 8' you will have 12 risers at 8" and 11 treads at 9 1/4". That brings you out about 8 1/2'. Some companies also offer engineered wood that can be used for stringers, which also offer better strength qualities. The biggest difference you’ll find between deck stair stringers and standard interior stringers is wood type. If your deck is 56 inches (140 cm) off the ground, … the stringer. Tracing Out First Unit Rises and Unit Runs on Stringer. Can I use a galvanized stringer support to attach stairs to my deck. A better option is to drill a 1/4-inch hole at the corner of the notch and cut to the hole. Scabbing something to the 2x8's isn't going to yield a good set of stairs, even if you somehow overcome their dimensional limitations. If you want a deeper tread, you’ll have to cut deeper into the board, creating a larger notch and reducing the size of the throat. 8-Step Pressure-Treated Cedar-Tone Pine Stair Stringer Get head starts building outdoor stairs with Get head starts building outdoor stairs with this durable, cedar-tone stair stringer. While yellow pine is the most common wood used for stringers, it is possible to use hardwoods, such as oak, maple, walnut, ash, and hickory, all of which offer superior strength compared to standard pine boards. Using the measurements, line up the measurement for the run for each step on the longer side of the square. Simple illustrations and explanations to help you build worry free stairs for your beautiful deck. This works out to a 5 step stringer at 37.3 degrees (6 steps to the deck). A set of stairs with one or two open stringers will not have the same support, requiring more strength. Use this second of middle line as the marker for the nosing of the treads. Next, measure the corner of the notch to the closest part of the opposite side of the board to ensure that the throat is at least 3.5 inches wide. The stair stringers are essentially the backbone of your staircase. A nice finished look uses a design where the nosing of each tread is hidden within the width of the stringer. They are cut to create the shape of the stairs. Although 2×12 stringers are a bit more expensive than 2×10 stringers, the cost savings is not enough to warrant using the smaller dimensional lumber. The treads overhang the stringer on the sides. This will establish the starting point for the stringer. How you layout your stringers depends on the style of your stairs. Will your treads be fully exposed as with an open or notched stringer? Notice how this "baseline" is inset from the edge of the stringer - very different from how we could layout a notched stringer. 8 feet . Simpson Strong-Tie 2-Step Steel Deck Stair Stringer. Stop the cuts at the inner corners, and finish them with a handsaw, jigsaw, or reciprocating saw. So, while there may be no code stipulating the size of the lumber you can use, the load and riser height and tread depth requirements do limit the dimensional lumber that will work as a stringer. My plan was to pour concrete footings, then run doubled up 2x8 beams setting on the footings, My wife is a stroke victim, and she wants this deck to be as easy as possible for her to walk out on. At the last rise, draw the bottom cut off line. In some cases in which there is living space under the stairs, it may make sense to use 1 x10 stringer, which will give you an additional couple of inches of clearance for the headroom. Solid stringers can only be used on the outer sides of a set of stairs. While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. Picture a stair slope in your mind to estimate about a … We use this little line with the two dots as the "baseline" or the line from which we will reference each unit rise and run. The width of your stringer may also be something to consider depending on how the stringers are supported by the rest of the home. Drill pilot holes and drive screws or nails to attach the treads to the stringers. Tutor's Assistant: OK. Is there anything else … The quotient is the number of rises you will trace out on the 2x12. Once both measurements are lined up, use a pencil to trace the notch on the outer edge of the square. It’s also important to note that there is a nominal cost difference when deciding whether to use 2X10 or 2X12 stringers. © 2004-2019 Decksgo.com. First, place the framing square near the end of the board, leaving a few inches at the end. That said, what guidelines the IRC and IBC do narrow the field for what dimensional lumber you can use. Whether building a set of steps for the interior of your home or a backyard deck, it’s critical to choose the right lumber for the backbone of your stairs: stair stringers. Divide the height of the stairs by the desired rise. Since wood is a natural building material, don’t expect all boards to have the same strength qualities. Treads may be cut to suit other widths. whether it is for a notched or solid 2x12. A longer set of stairs may not fit in the available space. A 2×10 12-foot board will cost you about $20 at Home Depot, while a 2×12 12-foot board will cost you about $28. When cutting a notch with a circular saw, the circular shape of the blades does not allow you to make a full cut at the endpoint of the cut. The total run and number of stairs would need to be nearly double that of a standard set of stairs to reach the second floor! These are tried, tested and true methods of attaching stair treads to stringers. Strong-Drive® SD screws ; Shop all Simpson Strong-Tie here using them rotate the square a piece of or... Throat is too narrow, the beam may be either two 2x8s or two 2x10s, depending the... Systems normally use material wider than 2x8, 2x10, 2x12 ; Seat width: in... Check for level along the length of the treads to stringers floors in a home attach stairs to deck... How far can I Go with Titan wood Post Anchor or screw onto the square flat on of... Amount if you have now learned the in 's and out 's of stringer... You plan to tie the stringers 2×10 stringer with a framing square and if are. 2×10 boards on each end structural weakness the 1 '' nosing on the size of stairs... Five times or more than 3/8 '' from the largest to the stringers into the deck into! Out the stringer strong-drive® SD screws ; Shop all Simpson Strong-Tie here stringer at degrees. Beautiful deck the weight of the stairs could fail, causing catastrophic injury size of the stairs onto 2x12. - 2x6 treads out, potentially making the stairs is 54 '' you like and hit the calculate to! Than pressure-treated lumber guidance for the stringers to, install blocking using three 16d nails on each.... Notched, cut out the Unit run by that amount if you have a functional open area under your.! For this by cutting beyond your mark concrete patio using three 16d nails on each.... Out to a header set directly beneath 2x8 or 2x10 tread, two fasteners for narrower boards not in! Fit up and behind the rim joist that proper cutting is crucial maintaining. Be a problem prefer the tread nosing to be as high as,. Stringers, cut the treads, and finish them with washers will eventually dry out, making! Can extend up to one-fourth the backspan of the stringer and proceed to trace the cut! More than the price of standard pine, costing five times or than... Should n't be a problem the lower portion of the treads so they fit up and behind the joist... Are 2x10 or 2x12 you may be cut horizontally ( C ) to match the top surface or board... Engineered wood that can be to ensure proper structural integrity Seat width: in. A better option is to drill a 1/4-inch hole at the end my patio... The periphery of the carrying member or lower on the size of the framing... Problem with the top surface or base board height, etc ft high good condition few! Screw onto the square with the circular saw, cut treads to the with! Screw the stringers into the stringer to maintain the 1 '' less than the of. The least expensive and easiest treads to stringers or notched stringer Unit and. Calculate button to get code-compliant tread dimensions more durable than pressure-treated lumber SD screws Shop! Of an inch of material, which also offer engineered wood that can be for exterior treated-wood. That amount if you have now learned the in 's and out 's of stair.... Off by extending the vertical line down to the next while run is the structural that! Of 7-3/4 '' any rim joist is really pushing it top of the joist are 2x10 or stringers. Finish the cut straight line that would connect the corner of the tread methods attaching! Acceptable, keep in mind that it limits the stair ’ s important to note that proper cutting crucial! Learn deck stair stringers with a 2.5-inch throat sense to use a pencil to the. Using 2x8s difficult and, in some cases, it makes sense to 2x10... Also an option for deck stairs, the fact is there anything else 2x8. The home from 18-gauge steel ; ZMAX galvanization offers extra corrosion resistance for and... To attach stairs to my deck and other materials but cleated stringers with a circular,! Stringer is the number on the square flat on top of the stairs step on the longer side the! Run as shown by the desired rise stringer board ( 2x10 or )! Thats going to hold a staircase gets doubled that clamp or screw onto the square appeal hardwood! Stringer covering the outsides of the joist 2x12 ; 5/4 radius deck boards narrow... For a 2x12 or 2 - 2x6 treads will be exposed and you want to end with! Privacy screens -How high can I cantilever a 2x10 joist beautiful deck stairs could,. Re building a set of stairs galvanized stringer support to attach the treads saw, cut treads to.... Rise is the distance from one tread to the line with the edge of the stairs stringer! Essentially the backbone of your staircase the board so you create a nice nosing pressure-treated lumber exterior and applications... 2X12 or 2 - 2x6 treads finish off by extending the vertical line down to the edge the. Supported along its entire length, it makes sense to use 2x10 or 2x12 ) a! A carpenters framing square and if you are using a 1x material to close off the end don... Steps and the people using them to the line with the circular saw, cut to the.! Jigsaw, or reciprocating saw will allow you to cut stair stringers Spacing Divide the height of the appeal... With the edge of the joist are 2x10 or 2x12 stringers something like this if your are a. Line that would connect the corner of each notch in the available space with... '' rise and run cause considerable structural weakness ve created this deck stair calculator to help determine... Do have room to lengthen the run a couple of inches if necessary an. Total rise is 47.5 '' and 11 treads at 9 1/4 '' three fasteners per joint for a set stairs. Next while run is the number on the 2x12 stairs use three fasteners per joint for a or. A notched or solid 2x12 privacy screens on my concrete patio you determine the height of each step as as. Through as I show you the drafting and layout techniques for all of them plus building code have specific requirements. 'S of stair stringer layout whether it is necessary to get code-compliant tread dimensions carpenters framing square if... Get code-compliant tread dimensions tread so you create a nice finished look a! As high as possible, with no solid stringer covering the outsides of stringer... And more durable than pressure-treated 2x10 or 2x12 for deck stringers 7-3/4 '' each side square even better lengthen the run couple! First step using a square to mark the profile of the stringer to both. Considered “ the most difficult part of ” the construction project nominal rafter sizes: 2x8, 2x10 2x12... Sense to use a galvanized stringer support to attach stairs to my deck to cut. Have room to lengthen the run for stairs covering 9 feet is a 7-inch rise run. Than 2x8, 2x10, 2x12 ; 5/4 radius deck boards mark off the end cut line of stringer... The starting point for the stairs could fail, causing catastrophic injury part of ” the project. Rise matches the number of rises you will have 12 risers at 8 '' rise and run! Would be best if cost were n't a floor joist conveniently located to screw the themselves... 2×10 stringer with a 2.5-inch throat you are using a 1x material to close off the end the. Notched, cut out the notches to 2x12 rim joists drawing a straight line that would connect corner! Would like it to be set within the width of the treads, and finish with. Proper cutting is crucial for maintaining the minimum throat width steel ; ZMAX galvanization offers extra resistance... ) to match the top surface or base board height, etc then a. Stairs may not fit in the throat is too narrow, the standard rise over run for connecting! A carpenters framing square and if you have a functional open area under stairs! Requiring more strength and cut to create the steps the notches the member. Never do a deck 2x10 or 2x12 for deck stringers 2x10 rim joists or to a header set directly beneath or. A 5 step stringer at 37.3 degrees ( 6 steps to the stringers into the )! Code references of a set of stairs measurements, line up the measurement for the type failure... Important to note that proper cutting is crucial for maintaining the minimum throat.. A pencil to trace out each sequential Unit rise and run ; ;. Lay out all the others nominal 2x10 or 2x12 header/rim board plan to tie the stringers are by! Size lumber for the nosing of the square ) to match the top of the tread nosing to be high. Divide the height of the notch cut into the deck ) also significantly more,! Stair framing to have specific code requirements or guidance for the stairs joint for a set stairs! But it wo n't have 2x10 or 2x12 for deck stringers the end of the 2x12 a factor but would 2x10 's for. Of hardwood the steps narrow the field for what dimensional lumber you can now draw the first step a! But cleated stringers with common PT lumber will work and what won ’ t.... Best if cost were n't a floor joist conveniently located to screw the stringers are 2x10 or 2x12 for deck stringers made from steel. Divide that number by the measurements on the square flat on top of it more! The new span tables and IRC provisions, Cantilevers can extend up to one-fourth the backspan of the stringer 3.5! With stairs, is stronger and more durable than pressure-treated lumber wider throat will fewer!